Mathematical Modeling of Protein Complexes

1. Introduction 

2. Physical methods for studying proteins

Describe the various experimental approaches for  determine the structure of molecules, the relative location of domains in space, the identification of active protein centers. Their advantages and disadvantages are shown:

2. Physical methods of  protein studies

2.1.  Electrophoresis  method.

2.2. Chromatographic method

2.3. Spectral method.

2.4. X-ray analysis of protein crystals

2.5. Spectroscopy in the ultraviolet and visible range.

2.6. Spectrofluorimetric  method

2.7. Circular dichroism.

2.8. Conclusions

3 Physical properties of amino acids and proteins.

tions

3.1. Structural organization of proteins.

3.2. The solubility of proteins.

3.3. Conclusions

4.1. The formation of  DNA in the nucleosome core.

4.2. The structure and function of histone proteins H2A, H2B, H3, H4.

4.3. Structure and function of the histone chaperone Nap1.

4.4. The structure and function of the p53 protein.

4.5. The structure and  function of the Mdm2 protein.

4.6. The structure and function of the P300 protein.

4.7. Structure and function of the Bcl-2  protein family.

4.8. Conclusions

5. Mathematical Simulation of Complex Formation of Protein Molecules Allowing for Their Domain Structure

A physical model of the interactions between protein molecules is presented, and an analysis of their propensity to form complex biological complexes is performed. The reactivities of proteins are studied using electrostatics methods based on the example of the histone chaperone Nap1 and histones H2A and H2B. The capability of proteins to form stable biological complexes that allow for different segments of amino acid sequences is analyzed. The ability of protein molecules to form compounds is considered by calculating matrices of electrostatic potential energy of amino acid residues constituting the polypeptide chain. The method of block matrices is used in the analysis of the ability of protein molecules to form complex biological compound

5.1. Description of the physical model

5.2. Numerical simulation of biological systems

5.3. Heterodimers  formation  (H2A-H2B) and (H3-H4).

5.4. Analysis of the histone chaperone homodimer formation of protein  Nap1.

5.5. The algorithm for finding active sites

taking into account different protein  sites.

5.6. Conclusions

5.7 Description of the program complex with the listing of programs.

6. Mathematical modeling of  histone dimers  formation in vitro with solutions of different ionic strength in the presence of monovalent salts

The chapter develops a physical model for the interaction of protein molecules and their ability to form complex biological complexes for the case in vitro in a solution of a monovalent salt.

Introduction.

6.1. Accounting for the screening effect in a salt solution.

6.2. Simulation of complex dimers histones  (H3-H4) and (H2A-H2B) formation  in   the monovalent salts solution.

6.3. Effect of salt solution  on  the domain binding.

6.4. Description of the program complex with the listing of programs.

6.5. Conclusion 

7. Mathematical modeling  of the temperature  effect  on binding of monomeric proteins  in aqueous solutions by  example on histones  H2A, H2B, H3 and H4.

Introduction

The chapter is devoted to mathematical modeling of  temperature  influence on the stability of histone dimers  H2A-H2B and H3-H4 by studying their behavior in different temperature regimes from C.

Introduction.

7.1. Description of the physical model.

7.2. Numerical simulation of the temperature  effect  on the binding of the monomeric proteins dimers H2A-H2B, H3- H4   in aqueous solutions.

7.3. Description of the program complex with the listing of programs

7.4. Conclusion

8. Mathematical modeling of the temperature  effect on binding of  different sites of protein BCL-XL  in aqueous solutions

Presents a mathematical model of the temperature effect on the formation and stability of homodimers formed by the Bcl-Xl proteins and its truncated amino acid sequences by studying their behavior in different temperature regimes( C) . A numerical calculation allows to analyze the contribution of different segments of the polypeptide chain into formation and stabilization Biological complex, as well as allow to determine sites of the protein molecules responsible for protein binding in aqueous solutions under different temperature regimes  C

8.1. The nature and structure of homodimer formation by the   BCL-XL.

8.2. Numerical modeling of the temperature influence on the nature homodimer formation by the BCL-XL according to different sites of the  proteins  in aqueous solutions.

8.3.Description of the program complex with the listing of programs.

8.4. Conclusion.

9. Mathematical modeling of the phosphorylation  effect on the nature formation of biological complexes P53-MDM2 and P53-P300.

Develops a physical model of the effect of the phosphorylation of the amino acid residues of the polypeptide chain on the formation of biological complexes, for example, phosphorylation on  two amino acid residues of  the flexible N-terminus of the p53 protein and analysis of the stability of the biological complexes  P53-Mdm2 and P53-P300 formed before and after phosphorylation.

9.1. The structure of the biological complex formations  of  P53-MDM2 and P53-P300.

9.2. Competing P300 and MDM2 proteins  for binding with  the N-terminus of the protein P53.

9.3. Numerical simulation of the phosphorylation  effect on the formation of   biological complexes P53-MDM2 and P53-P300 .

9.4. Description of the program complex with the listing of programs.

9.5. Conclusions.

References