Our expertise
Biomolecular modelling encompasses a wide range of in silico methods. These methods are used in many research areas. In addition to general biomolecular modelling, which encompasses the structure, function and interaction of biomolecules, our research team is specifically focused on the study of new and the evaluation of known bioactive compounds. In addition to the newly synthesised ones, we are committed to investigate natural, food-derived biactive compounds (such as biactive peptides, polyphenols, etc.) that could modulate physiological processes and thus improve human health. The expertise of our research team is presented below.
Lead discovery, optimization and rational drug design
We perform the necessary in silico steps for successful drug design, such as target identification and validation, lead discovery and optimization and preclinical tests. Our molecular modelling rely on up-to-date knowledge and experience and offer reliable and accurate results.
Computer Aided Drug Discovery
Computer Aided Drug Discovery (CADD) utilizes sophisticated molecular modelling software to identify and evaluate potential drug targets and optimize drug candidates. CADD can be used to identify small molecules that interact with and bind to the target, as well as to predict the safety and efficacy of drug candidates through in silico simulations. We perform both, ligand based and structure based drug discovery methods.
1.Ligand based drug discovery
-Pharmacophores
-SAR/QSAR/3D-QSAR
2.Structure based drug discovery
-Virtual screening
-Molecular docking
-Molecular Dynamics
-MMGBSA
-Structure based de novo drug design
-Structure based optimization
Rational drug design
Using and combining information obtained by ligand and structure based drug discovery as well as molecular dynamics simulations, we perform lead optimization and rational drug design.
Target identification of newly synthesized organic compounds
Newly synthesized organic compounds commonly lack information regarding their biological activity. We use numerous in silico techniques in order to predict target molecules of newly synthesized small molecules. After experimental confirmation, the obtained results provide a new perspective and application of such compounds.
Using in silico techniques we are able to make a small selection of potential inhibitors that should be further tested using in vitro methods.
Designing of proteins in order to provide desirable properties and reactions
Protein engineering, such as the modification and design of new proteins/enzymes, including point mutations or the construction of chimaeras, can be a highly beneficial step in new or improved technological processes that could make a difference in science and technology. One example is the improvement of thermal stability, which is one of the crucial steps in the development of commercial enzymes for process engineering. To this end, we use cluster analysis and ancestral sequences to identify suitable mutation sites.
Wandi, et al., 2020
doi:10.1111/febs.15192
Investigation of enzyme reactions
Comprehensive analysis of potential energy of chemical reactions and transition states are crucial steps in their optimization and design of new reactions
Potential energy of chemical reaction
Potential energy surface
Time-dependent Shcrödinger equation
Interaction of biomolecules with materials
Investigation of interactions of biomolecules with artificial materials is crucial in various range of biotechologiacal fields, including design of biosensors, drug distribution, food packaging, etc.
Project in progress
Project in progress
Literature research
First and crucial step in any scientific research is thorough and comprehensive literature research. Detailed information regarding a subject of interest and current state of the research is essential for valid hypothesis setting. Up to date data must be thoroughly reviewed in order to avoid misleading information. We perform professional and detailed reviews of literature by searching leading literature databases and world`s leading journals (PubMed, Sciencedirect, etc.).
Database search
We offer database search and collection of data related to the topic of interest (NCBI, PDB, Uniprot, Zinc, Brenda, Drugbank, etc.). Data regarding availability of RNA/DNA and proteins` sequences, structures, ligands, their quality and usability for a specific research of interest are essential for project success.
Sequence Analysis
Analysis of RNA/DNA and protein sequences using reliable and proven software. In order to analyze sequences we perform multiple sequence alignment, sequence annotation, cluster analysis, search for individual conserved nucleotides and residues, construct DNA primers, etc. Molecular evolution is a basis for diversity of life. Therefore, sequence analysis provides us valuable information regarding relations among sequences and changes with functional consequences. For example, sequence analysis can provides us information regarding individual responses to diseases and drugs, which is one of the fundamental cores of personalized medicine.
Vukic, et al., 2015
DOI: 10.1080/08905436.2015.1059766
Analysis of compounds structure
Detailed and comprehensive analysis of available structural data is essential for understanding mechanisms of compounds` activity as well as for development of a strategy for activity modification (inhibition or enhancement). Activities of small molecules can be efficiently modified through in silico chemoinformatic analysis which falls upon our field of expertise. High quality structure of target molecule is highly important for drug design. Analysis of active site as well as allosteric binding sites and understanding of their properties provides framework for rational drug design through modifications of interactions with the target molecule (covalent, electrostatic, hydrophobic, water bridges, etc.).
Wandi, et al., 2020
doi:10.1111/febs.15192
Wandi, et al., 2020
doi:10.1111/febs.15192
Maruf, et al., 2006
doi:10.1038/nature04716
Homology modelling
Based on BLAST search for homology sequences we construct (modeller) and evaluate (Rhamachandran plot, Qmean analysis, visual inspection) homology models of proteins.
Vukic, et al., 2015
DOI: 10.1080/08905436.2015.1059766
Virtual screening
One of the first steps in computational search for new drugs is virtual screening. We are able to screen large offline databases of small molecules that are stored on our local machines (FIMM database (140 000 compounds), UNPD - Universal Natural Products Database (220 000 compounds), TCM Database@Taiwan (20 000 compounds)). Natural products are desirable for screening due to wide diversity of compounds as well as good purchasability. Furthermore, we are able to construct desirable database for virtual screening using ZINC, MolPort, ChEMBL or other online databases. We screen molecules using several methods:
-Molecular docking simulation:
– High throughput virtual screening
-Pharmacophore based screening:
- based on protein ligand complex
- based on receptor cavities
- based on receptor residues
- based on multiple/single ligands
Project in progress
Molecular docking simulations
High precision molecular docking simulations (covalent and non-covalent) are essential in prediction of ligand binding to the target molecule in absence of experimental data. In order to select a potent inhibitor, accurate prediction of ligand`s potential orientation is crucial for determination of binding energy. Several techniques and software have been shown to be very effective in prediction of protein-ligand complex. For non-covalent docking we prefer Glide and Autodock due to high precision, flexible residues and possibilities of manual docking, while we use CovDock for covalent docking simulations.
Calculation of binding energies
Although calculation of absolute or relative binding energies using in silico techniques is still a highly challenging process, some progress have been achieved in recent years. Using high end techniques and software (MMGBSA, FEP+) we are able to narrow selection of potential inhibitors which should be further tested using molecular dynamics simulations and in vitro techniques.
Molecular Dynamics simulations
Information about stability and movements of modelled structures and complexes are highly important to understand dynamics of the subject of interest (or process). We use Desmond to setup the system and perform MD simulationst on in house and distant servers equipped with supercomputers (CPU and GPU).
Wandi, et al., 2020
doi:10.1111/febs.15192
SAR /QSAR / 3D-QSAR
Correlation between structure and activity/property is a basis for ligand based drug design. The prediction of activity based on molecular structure is a very important step in synthesis of compounds with desired biological activity and rely on assumption that structurally similar molecules have similar biological activity. In order to predict compounds properties we construct different models (selective QSAR, CoMFA, CoMSIA, etc.) and use different regression and validation methods (Artificial neural networks, R2, Q2, etc.)
Vukic, et al., 2022
doi: 10.1007/s11094-022-02686-z
Vukic, et al., 2017
doi: 10.1016/j.nutres.2017.07.009
Ligand based pharmacophores
We search for common chemical features of one or more (aligned) ligands that contribute to the binding interactions at the target protein and are essential the biological activity:
- hydrogen bond acceptors
- hydrogen bond donors
- hydrophobic groups
- aromatic groups
- positively charged group
- negatively charged group
Using pharmacophores we:
- predict ADMET properties
- explain the structure-activity relationships of a series of ligands
- search for novel active ligands through virtual screening of compound libraries
Protein – peptid, protein – protein docking
We perform protein – peptid and protein – protein docking and analyze their interactions. Peptides are one of the main modulators in human body which put them in the focus of scientific research in recent years.
Project in progress
Nucleic acids interactions
We investigate interactions of nucleic acids (both DNA and RNA) with proteins, which give us information regarding transcription, translation, regulatory or some other process, as well as interactions with small molecules.
Project in progress
Jaric, et al., 2023
ADME-Tox preclinical investigation of potential drugs
Pharmacokinetic properties of a drug candidate is extremely important for its further development as a drug. In order to safely and efficiently act, the drug must have adequate ADME-Tox properties (Absorption, Distribution, Metabolism, Excretion and Toxicity). We use various in sillico tool in order to predict ADME-Tox properties of desired compounds.
