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Machine learning approaches for computer aided drug discovery
Pharmaceutical drug discovery is expensive, time consuming and scientifically challenging. In order to increase efficiency of the pre-clinical drug discovery pathway, computational drug discovery methods and most recently, machine learning-based methods are increasingly used as powerful tools to aid early stage drug discovery.
In this thesis, I present three complementary computer-aided drug discovery methods, with a focus on aiding hit discovery and hit-to-lead optimization. In ad...
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Computational Drug Discovery and Design pp 1–20 Cite as
Computer-Aided Drug Discovery and Design: Recent Advances and Future Prospects
- Alan Talevi 4 , 5
- First Online: 08 September 2023
1536 Accesses
2 Citations
1 Altmetric
Part of the book series: Methods in Molecular Biology ((MIMB,volume 2714))
Computer-aided drug discovery and design involve the use of information technologies to identify and develop, on a rational ground, chemical compounds that align a set of desired physicochemical and biological properties. In its most common form, it involves the identification and/or modification of an active scaffold (or the combination of known active scaffolds), although de novo drug design from scratch is also possible. Traditionally, the drug discovery and design processes have focused on the molecular determinants of the interactions between drug candidates and their known or intended pharmacological target(s). Nevertheless, in modern times, drug discovery and design are conceived as a particularly complex multiparameter optimization task, due to the complicated, often conflicting, property requirements.
This chapter provides an updated overview of in silico approaches for identifying active scaffolds and guiding the subsequent optimization process. Recent groundbreaking advances in the field have also analyzed the integration of state-of-the-art machine learning approaches in every step of the drug discovery process (from prediction of target structure to customized molecular docking scoring functions), integration of multilevel omics data, and the use of a diversity of computational approaches to assist target validation and assess plausible binding pockets.
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Department of Basic and Applied Sciences, Dayananda Sagar University, Bangalore, Karnataka, India
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Talevi, A. (2024). Computer-Aided Drug Discovery and Design: Recent Advances and Future Prospects. In: Gore, M., Jagtap, U.B. (eds) Computational Drug Discovery and Design. Methods in Molecular Biology, vol 2714. Humana, New York, NY. https://doi.org/10.1007/978-1-0716-3441-7_1
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DOI : https://doi.org/10.1007/978-1-0716-3441-7_1
Published : 08 September 2023
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Computer-Aided Drug Discovery and Design: Recent Advances and Future Prospects
Series: Methods In Molecular Biology > Book: Computational Drug Discovery and Design
Overview | DOI: 10.1007/978-1-0716-3441-7_1
- Laboratory of Bioactive Compound Research and Development (LIDeB), Faculty of Exact Sciences, National University of La Plata (UNLP), La Plata, Argentina
- Argentinean National Council of Scientific and Technical Research (CONICET), La Plata, Argentina
Computer-aided drug discovery and design involve the use of information technologies to identify and develop, on a rational ground, chemical compounds that align a set of desired physicochemical and biological properties. In its most common form, it
Computer-aided drug discovery and design involve the use of information technologies to identify and develop, on a rational ground, chemical compounds that align a set of desired physicochemical and biological properties. In its most common form, it involves the identification and/or modification of an active scaffold (or the combination of known active scaffolds), although de novo drug design from scratch is also possible. Traditionally, the drug discovery and design processes have focused on the molecular determinants of the interactions between drug candidates and their known or intended pharmacological target(s). Nevertheless, in modern times, drug discovery and design are conceived as a particularly complex multiparameter optimization task, due to the complicated, often conflicting, property requirements. This chapter provides an updated overview of in silico approaches for identifying active scaffolds and guiding the subsequent optimization process. Recent groundbreaking advances in the field have also analyzed the integration of state-of-the-art machine learning approaches in every step of the drug discovery process (from prediction of target structure to customized molecular docking scoring functions), integration of multilevel omics data, and the use of a diversity of computational approaches to assist target validation and assess plausible binding pockets.
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Computer Aided Drug Design and its Application to the Development of Potential Drugs for Neurodegenerative Disorders
Mohammad hassan baig, khurshid ahmad, gulam rabbani, mohd danishuddin.
Neurodegenerative disorders (NDs) are diverse group of disorders characterized by escalating loss of neurons (structural and functional). The development of potential therapeutics for NDs presents an important challenge, as traditional treatments are inefficient and usually are unable to stop or retard the process of neurodegeneration. Computer-Aided Drug Design (CADD) has emerged as an efficient means of developing candidate drugs for the treatment of many disease types. Applications of CADD approach to drug discovery are progressing day by day. The recent tendency in drug design is to rationally design potent therapeutics with multi-targeting effects, higher efficacies, and fewer side effects, especially in terms of toxicity.
A wide literature search was performed for writing this review. An updated view on different types of NDs, their effect on human population and a brief introduction to CADD, various approaches involved in this technique, ranging from structural-based to ligand-based drug design has been discussed. The successful application of CADD approaches for the treatment of neurodegenerative disorders is also included in this review.
In this review, we have briefly described about CADD and its use in the development of the therapeutic drug candidates against NDs. The successful applications, limitations and future prospects of this approach have also been discussed.
CADD can assist researchers studying interactions between drugs and receptors. We believe this review will be helpful for better understanding of CADD and its applications towards the discovery of new drug candidates against various fatal NDs.
1. BACKGROUND
The development of novel potential therapies for the treatment of NDs represents an important means of extending life span and quality of life in the elderly [ 1 ]. The development of potential therapeutics for NDs presents an important challenge, as traditional treatments are inefficient and usually are unable to stop or retard the process of neurodegeneration [ 2 ], which is highly complex and includes many neuropathological conditions and cognitive function losses, such as, memory and learning losses. NDs cause neuron loss and brain aging, which eventually lead to death. In fact, it has been estimated that more than 25% of global deaths and disabilities are caused by brain-associated disorders [ 3 ], such as, Alzheimer’s disease (AD), Parkinson’s disease (PD), Huntington’s disease (HD) and amyotrophic lateral sclerosis (ALS) [ 4 , 5 ]. Available treatments are limited, and no truly effective drug is available for many NDs. Furthermore, the number of drugs approved is limited by the high failure rates of lead compounds in clinical trials [ 6 ].
Identifying novel, potential drugs for NDs is difficult using traditional approaches of drug discovery [ 7 ]. However, during the last decade, computers have been used to aid and accelerate the process of drug discovery, and this process is now referred to as computer-aided drug design (CADD) or computer-assisted molecular design (CAMD).
Computer-Aided Drug Design (CADD) emerged as an efficient means of identifying potential lead compounds and for aiding the developments of possible drugs for a wide range of diseases [ 8 , 9 ]. Today, a number of computational approaches are being used to identify potential lead molecules from huge compound libraries.
Applications of CADD approach to drug discovery are progressing on a daily basis. The recent tendency in drug design is to rationally design potent therapeutics with
multi-targeting effects, higher efficacies, and fewer side effects, especially in terms of toxicity. In this review, we provide a brief introduction to CADD and include details of structure-based drug design (SBDD) and ligand-based drug design (LBDD), and their uses to identify potential drug candidates for NDs. In addition, we provide an up-to-date summary of the successes and limitations of CADD against NDs and discuss its future prospects.
2. COMPUTER AIDED DRUG DESIGN (CADD)
To introduce a new drug to the market is a costly affair that involves considerable time and money. The average time taken to discover/develop a drug is around 10-15 years and the cost stands at around US$ 800 million [ 10 - 12 ]. Not surprisingly, pharmaceutical companies focus on reducing development times and budgets without adversely affecting quality. In the 1990’s, a large number of developments were undertaken using combinatorial and high-throughput screening technologies, which accelerated drug discovery [ 13 - 15 ]. These technologies were widely adopted because they enabled the rapid synthesis and screening of large libraries, but unfortunately, no significant success was achieved and little progress toward the development of new molecular entities was made [ 16 , 17 ].
A combination of advanced computational techniques, biological science, and chemical synthesis was introduced to facilitate the discovery process, and this combinational approach enhanced the scale of discovery. Eventually, the term computer-aided drug design (CADD) was adopted for the use of computers in drug discovery [ 17 , 18 ]. Advanced computational applications have been shown to be effective tools and notable successes have been achieved using these techniques. CADD is a specialized discipline, whereby different computational methods are used to simulate interactions between receptors and drugs in order to determine binding affinities [ 19 ]. However, the technique is not limited to studies of chemical interactions and binding affinity predictions, as it has many more applications ranging from the design of compounds with desired physiochemical properties to the management of digital repositories of compounds. An overview of CADD is provided in Fig. ( 1 ) . CADD may be broadly categorized embracing both structure- and ligand-based drug design. Fig. ( 2 ) illustrates various approaches applied in CADD.
Overview of CADD process.
Various approaches applied in CADD.
Virtual screening (VS) is a computational technique used for screening large datasets of molecules, and has been successfully used to complement High Throughput Screening (HTS) for drug discovery [ 8 , 20 , 21 ]. The major aim of VS is to enable the rapid, cost-effective evaluation of huge virtual compound databases to screen for effective leads for synthesis and further study [ 22 ]. Virtual database screening can be applied to screen large libraries of compounds using various computational approaches to identify those entities likely to bind to a molecular target of interest [ 23 , 24 ]. To a large extent, VS mitigates the problem of drug synthesis because it utilizes large libraries of pre-synthesized compounds.
2.1. Structure-based Drug Design (SBDD)
Structure-based drug design utilizes protein three-dimensional (3D) structural information to design new biologically active molecules [ 25 ]. Thus, the identification of a target molecule and the determination of its structure is the main, initial step of SBDD [ 23 , 26 ]. The identified target may be an enzyme associated with a disease of interest. Based on binding affinity determinations, potential compounds are determined which attenuates the activity of target by its inhibition. Thus, SBDD utilizes information about a biological target and identifies potentially new medications. As such SBDD constitutes a marked advancement in the computational techniques used in the biophysics, medicinal chemistry, statistics, biochemistry, and other fields [ 27 ]. Scientific advancements have resulted in a large number of techniques for predicting protein structures. These state-of-the-art technologies enable the determination of the structures of large numbers of proteins by using cryo-electron microscopy (EM), nuclear magnetic resonance (NMR), X-ray crystallography and computational methods like homology modeling and molecular dynamic (MD) simulation [ 28 ].
2.1.1. Homology Modeling
Determining the structure of a target molecule follows the identification of a specific drug target [ 29 ]. Despite the availability of advanced techniques, the structures of a large number of proteins have not been identified [ 30 ]. Homology modelling helps in this situation because it can be used to generate the structures of proteins on information available for similar proteins [ 31 ].
Structural information about an identified target is a prerequisite for SBDD, but the structures of several identified neurodegenerative drug targets have yet not been determined [ 32 , 33 ]. A large number of studies have been conducted using the homology modelling approach to generate structures of identified target molecules. Structural information is also required to gain insights of protein activities. Dhanavade et al . generated the structure of cysteine protease, which degrades amyloid beta peptide, an important causative agent of Alzheimer’s disease [ 34 ]. Several in silico experiments have been conducted using the modeled structure of cysteine protease to investigate the nature of its binding site.
2.1.2. Molecular Docking
Molecular docking is a computational process widely used for rapidly predicting the binding modes and affinities of small molecules against their target molecules (usually proteins) [ 35 , 36 ]. This in silico process has achieved a position of great importance in the drug discovery field [ 21 , 36 - 38 ]. Molecular docking has emerged over the last two decades and is now considered an indispensable tool for CADD and in the structural biology field, and has been shown to be more efficient than traditional drug discovery methods. Molecular docking has been greatly facilitated by dramatic growth in computer power and the increasing availability of small molecule and protein databases. Fig. ( 3 ) illustrates the basic principle of molecular docking. Recent advancements in computer methods and access to 3D structural information of biological targets are set to increase the effectiveness of this technique and facilitate its large-scale application to studies of molecular interactions involved in ligand-protein binding. Generally, small molecules can be docked in three different ways, that is; (a) by rigid docking, where both target and ligands are treated as rigid entities; (b) by flexible docking, where both ligand and target are considered to be flexible; and (c) by flexible ligand docking, where the ligand is considered to be flexible and the target is considered rigid [ 39 ]. Many molecular docking programs have been developed during recent years, such as, AutoDock [ 40 ], Dock [ 41 ], FlexX [ 42 ], Glide [ 43 ], Gold [ 44 ], Surflex [ 45 ], ICM, and LigandFit [ 46 ], and been used successfully in many computer based drug discovery projects. Table 1 1 provides a list of major molecular docking tools in practice. Typically, the major goal of molecular docking is to identify ligands that bind most favorably within receptor binding sites and to determine its most energetically favored binding orientations (poses). The term “binding pose” is the orientation/confirmation of a ligand relative to its receptor. A binding pose either refers to a conformation of a ligand molecule within the binding site of its target protein which has been confirmed experimentally, or a computationally modelled hypothetical conformation. The search algorithm and the scoring function are two important components for determining protein-ligand interactions [ 47 ]. The search algorithm is responsible for searching different poses and conformations of a ligand within a given target protein and the scoring function estimates the binding affinities of generated poses, ranks them, and identifies the most favorable receptor/ligand binding modes [ 47 , 48 ]. An ideal search algorithm should be fast and effective, and the scoring function must be capable of determining the physicochemical properties of molecules and the thermodynamics of interactions.
Basic principle of molecular docking.
List of major available molecular docking tools.
A large number of trials are being conducted to identify binding modes of ligands and selection of the most energetically favored poses. In order to achieve this, molecular docking tools are used to generate a set of different ligand binding poses and a scoring function is used to estimate the binding affinities of generated poses to identify the best binding mode. The energy change caused by ligand/receptor complex formation, is given by the Gibbs free energy (ΔG) and the binding constant (Kd) [ 49 , 50 ]. The binding energy of a complex is predicted by evaluating physicochemical features involved in ligand-receptor binding, which include desolvation, intermolecular interactions, and entropic effects [ 51 ]. Sehgal et al . identified a number of compounds active against HSPB8 based on molecular docking results [ 52 ].
2.2. Ligand Based Drug Design (LBDD)
LBDD offers a general approach for elucidating relationships between the structural and physicochemical properties of compounds/ligands and their biological activities. This approach is applied when 3D structural information of a target protein is unavailable. In this process the available information of ligands and their biological activity is used for the development of new potential drug candidates. LBDD is widely used in pharmaceutical research, as more than 50% of approved drugs targeting membrane proteins (for which 3D structures are often not available, such as, GPCR). It is based on the assumption that compounds with similar structural features share common biological activities and interact/inhibit common target molecules [ 36 , 37 ].
The representation of molecules is the basis of LBDD approach. Molecular descriptors are numerical values used to represent the structural and physicochemical properties of molecules [ 53 , 54 ]. The molecular descriptor field is strikingly interdisciplinary and includes a number of different theories [ 55 ]. Active molecules are represented by the 0D-4D class of molecular descriptors [ 56 ]. Constitutional and count descriptors are 0D molecular descriptors, chemical fingerprints or lists of structural fragments, such as, SMILES and SLN, are 1D descriptors, graph invariants in which atoms are denoted as nodes and bonds as edges are 2D-descriptors, geometrical, WHIM and others are 3D descriptors, and those derived from CoMFA or DRID methods are classified as 4D descriptors [ 57 ]. Similarity searching is a key aspect of the LBDD method. This technique uses a known active compound as a query compound to find similar compounds and then rank compounds identified in a database. Based on this belief, structurally similar molecules exhibit similar biological activities and physicochemical properties. Numerical descriptors are applied and similarity coefficient is defined to quantify the degree of similarity (similarity/ dissimilarity). Fingerprint-based similarity or 2D similarity measures are widely used for similarity searching. A number of coefficients are applied in similarity searching with different fingerprint molecular databases (Cosine, Euclidian distance, Forbes, Tanimoto coefficients etc .).
The Tanimoto coefficient is most popular and widely accepted similarity index for binary variables, despite its well-documented size bias. It may be defined as:
where overlap ab , overlap aa , and overlap bb are the volume overlaps of molecule a with molecule b , of molecule a with itself, and of molecule b with itself, respectively. Values of T c range from 0 (no similarity) to 1 (a perfect match).
LBDD is generally categorized as Quantitative Structure Activity Relationship (QSAR) or pharmacophore modeling.
2.2.1. QSAR and its Role in Drug Discovery
The QSAR method and pharmacophore modeling are the most popular approaches to ligand-based drug design [ 58 , 59 ]. QSAR methods are based on the belief that molecular structures are directly associated with biological activities, and thus, that molecular or structural variations alter biological activities. QSAR is defined as a process involving the construction of computational or mathematical models using chemometric techniques to identify significant correlations between a series of structures and functions [ 60 ]. For QSAR, the primary hypothesis is that “compounds with similar structural or physiochemical properties show similar activities”. To identify potential leads, a library of lead compounds with the desired biological activities is produced. A model is then developed to predict the quantitative relation between the structural and physico-chemical features of these compounds and their biological activities. A statistical model generated using such relations is then used to mathematically optimize the biological properties of sets of compounds and maximize relevant biological activities. QSAR is used to modify existing compounds and improve their activities, and has been widely used in drug discovery to improve existing drugs for NDs. A study conducted by Dong et al . successfully designed a new series of PDE-4 inhibitors using the QSAR approach [ 61 ]. Bhadoriya et al . successfully implemented QSAR to the discovery of more potent anti-Alzheimer’s agents [ 62 ]. In latter, QSAR studies were carried out on a series of 34 fused 5,6-bicyclic heterocycles to identify the structural characteristics needed to inhibit Aβ42.
2.3. Pharmacophore Modelling
A pharmacophore is an assembly (3D arrangement) of 'steric' and 'electronic' features required for optimal supramolecular interaction with a specific biological target structure and to prompt/block its biological response [ 63 ]. Ligand-based pharmacophore model generation is based on available information on the biological activities of compounds/ligands. A pharmacophore does not symbolize an actual molecule/ligand or real connection between functional groups, but rather provides an abstract description of molecular features that are vital for molecular interactions between molecules and macromolecular ligands.
Pharmacophore modeling is widely used to identify potential lead molecules quickly. During the recent era of drug design, many therapeutically potent and well accepted drug targets with unknown active site geometries have been identified. Pharmacophore modeling provides an efficient means of rapidly screening huge databases of compounds. The elucidation of common pharmacophore features is conducted by aligning conformational models and active compounds three dimensionally. A superimposition algorithm assembles training set compounds (3D structure) in the same position/arrangement of their respective chemical properties/features. Pharmacophoric features are positioned such that all/maximum compounds share a common chemical functionality. To refine a shared pharmacophore feature, information regarding inactive compounds can be included in the model generation process. A number of tools and software have been developed for pharmacophore development, such as, Phase, Catalyst/Discovery Studio, MOE, and LigandScout [ 64 ].
3. SUCCESSFUL CADD APPROACHES TO THE TREATMENT OF NEURODEGENERATIVE DISORDERS
The success of CADD has resulted in its being recognized as an important technique in the research and pharmaceutical fields. There are many examples of the successful application of CADD, but here we describe its successes with respect to the design of drugs for the treatment of NDs. Amyloid-β is an important therapeutic target in Alzheimer’s disease [ 65 ]. Chen et al . used an in silico approach to study a series of peptides against the fibrillar form of Aβ, and reported two highly active compounds [ 66 ]. These peptides were subsequently found to inhibit the neurotoxic effects of Aβ on neuroblastoma cells.
BACE-1 is an enzyme that has been reported to be essential for β-amyloid generation [ 67 ]. Research suggests inhibition of this enzyme stops the production of β-amyloid, and thus, prevents NDs like Alzheimer's disease [ 68 ]. This finding has made BACE-1 an important therapeutic target for NDs. During the last few years, several computational approaches have been used to study the structural behavior of BACE-1 and to design their inhibitors [ 69 - 71 ].
ROCK-I and NOX2 are among the most attractive potential therapeutic targets for several NDs [ 72 - 75 ]. Inhibition of these two enzymes constitutes treatment for neurological diseases like autism spectral disorder, Alzheimer, and fragile X syndrome. Alokam et al . reported the successful use of CADD to design dual inhibitors for these enzymes [ 76 ], by employing a combination of pharmacophores and using a molecular docking approach to identify chemical entities. In vitro validation of selected chemical entities demonstrated their inhibitory potentials against ROCK-I and NOX2.
HDAC6 is a member of the class IIb Histone deacetylases (HDACs) family and is usually found in cytosol in association with non-histone proteins [ 77 , 78 ]. HDAC6 has been widely reported to be a crucial therapeutic drug target for several NDs [ 79 - 81 ]. The implementation of CADD has been reported to result in the design of a potential inhibitor of this enzyme. In one study conducted by Goracci et al ., a virtual screening approach was used to identify potential inhibitors for HDAC6, and these were then subjected to in vitro testing. The results obtained showed inhibitors had low cytotoxicities, suggesting potential for drug development [ 82 ]. Several other reports have described the successful use of CADD in the NDs.
4. Limitations
Despite a number of successful applications of CADD to modern drug design, it has its limitations. In particular, like any computer assisted hypothetical system results must be validated in actual systems, and many lead molecules identified using CADD have failed to exhibit desired activities in biological systems [ 83 , 84 ]. Several parameters must be met before potential compound to be approved as potent lead/drug, as it has to pass several pharmacological criteria. In fact, an average of only 40% of lead/drug candidates passes the different phases of clinical trials and obtains approval for clinical use.
Any computational tool based on pre-defined algorithms and scripts has its limitations, and the computational tools/methods used in CADD, such as, molecular docking, virtual screening, QSAR, pharmacophore modeling, and molecular dynamics, have their own limitations [ 49 , 85 - 88 ]. Furthermore, ADME and many toxicity prediction tools are not supported by solid experimental data, and many examples of the failure of these computational approaches can be found in the literature [ 89 , 90 ].
To overcome limitations and improve accuracy in terms of predicting potent leads, regular updates of tools and algorithms are needed. Database reliability and high quality validated experimental molecules is to be developed and updated because many pharmacophores do not pass biological activity process due to non-availability of good quality data sets. Databases should contain detail data on genomics and proteomics, high quality sequence information, physicochemical properties, and structures.
In the present era of drug discovery, the application of CADD counts up the most important accountability, and provides computational tools and algorithms that save time, costs, and reduce the risk of detecting non-viable developmental leads. The discovery of a new lead/drug using recent CADD paradigms requires a systematic understanding of the molecular and pathological conditions induced by diseases. Early diagnosis of NDs remains a huge challenge for researchers and clinicians. However, CADD can assist researchers studying interactions between drugs and receptors. The pharmacoinformatic approach is being applied to modern drug discovery and is providing much basic knowledge regarding drug-receptor interactions. Novel technologies and computational algorithms are required to move the CADD approach forward, as new developments are likely to lead to tools for disease identification and the screening of potential lead compounds. The emerging field of neurological studies, which includes neuroproteomics and neurogenomics, may aid understanding of the neuronal alterations associated with NDs. Furthermore, the application of technologies associated with neuroproteomics, neurogenomics, and next generation sequencing, and genome wide association studies may result in the identification of novel therapeutic targets and ultimately improve our ability to treat NDs.
Acknowledgements
This work was supported by the grant K16281 awarded to Korea Institute of Oriental Medicine (KIOM) from Ministry of Education, Science and Technology (MEST), Republic of Korea.
List OF Abbreviations
Consent for publication.
Not applicable.
Conflict of Interest
The authors declare no conflict of interest, financial or otherwise.
Applications of Deep Neural Networks in Computer-Aided Drug Design
Degree type.
- Doctor of Philosophy
- Medicinal Chemistry and Molecular Pharmacology
Campus location
- West Lafayette
Advisor/Supervisor/Committee Chair
Additional committee member 2, additional committee member 3, additional committee member 4, usage metrics.
- Computational chemistry
- Cheminformatics and quantitative structure-activity relationships
- Bioinformatics and computational biology not elsewhere classified
- Structural biology (incl. macromolecular modelling)
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