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Biomedical subjects

I B Golovanov

Publications and source records attributed to I B Golovanov.

At least 19 recordsLinked to original sources
PubMed1976

[Study of carnosine complexes with nucleotides by the method of high resolution nuclear magnetic resonance].

It is shown that the formation of a carnosine--nucleotide complex (ATP, ADP, AMP) takes place. The stability of the complex mainly depends on: 1) the staking interaction between the heterocyclic rings of carnosine and nucleotides; 2) the electrostatic interaction between the phosphate groups of nucleotide and the positive charged amino group NH3+ of the beta-alanine part of carnosine. The formation of the hydrogen bond between dipeptide COO- group and N1 or N7 of nucleotide is also possible. The complex stability strongly depends on the charge-state of the components and little on the number of the phosphate groups of nucleotide (ATP greater than or equal to ADP greater than AMP).

Adenine Nucleotides↗
PubMedDate not supplied

[Hydrolysis of acetals and approach to the modeling mechanism of reactions involving lysozyme].

Using quantum chemistry CNDO/2 method the mechanism of reaction of polysaccharides with lysozyme was investigated. The molecule of acetal (H3C-O-CH2-O-CH3) was taken as the simplest substrate model. In the framework of the simple model the influence of interaction of the substrate with Glu-35 and Asp-52 on activation of the substrate is described. It is essential that for the maximum activation of the bond broken the optimum (but not the most energetically advantageous) arrangement of Glu-35 should be realized. The optimum arrangement of the amino acid residues of the enzyme should also be realized for the liberation of the groups which took part in the reaction, only one degree of freedom being actual in this process, and the motion of the system occurs along this degree of freedom. It was shown that substrate distortion could cause its activation.

Acetals↗
PubMedDate not supplied

[Simulated modeling of biopolymer molecular structure].

A simple approach for simulation of structure of biopolymers and their complexes is developed, including methods for conformational analysis "in vacuum" and methods for estimation of free energy of transfer between organic phase and water, evaluating hydrophobic interactions. The possibilities of the described methods are demonstrated by the simulation of the structure of C60-hydrocarbon polymer and glycine and alanine peptides.

Biopolymers↗
PubMedDate not supplied

[Conformational analysis of anti-arrhythmia agents of the lidocaine series and a model for the mechanism of their action].

After conformation analysis of a number of lidocaine-like antiarrhythmic molecules a simple model of their mode of action is suggested. It is proposed that the hydrophobic antiarrhythmic molecules after their absorption on cytoplasmic membranes concentrate due to polar interactions close to ionic channel proteins, then bind to these proteins and allosterically influence the process of ionic conductance.

Allosteric Regulation↗
PubMedDate not supplied

[The effect of side radicals on the peptide structure. Surface of potential energy of model alanine and phenylalanine dipeptides].

The problem of stabilization of different dipeptide conformations is discussed within the fragment-fragment interactions method. It is shown, that the introduction of a CH3-group in glycine is a weak perturbation and for Ala-dipeptide the preferential structure remains C7 (like for glycine). On the contrary the introduction of a C6H5CH2-group in glycine is a strong perturbation and for Phe-dipeptide C5 becomes the preferential structure.

Alanine↗
PubMedDate not supplied

[Stability of the alpha-helix structure of oligopeptides].

The problem of stabilization of oligopeptide alpha-helix conformation is discussed. The stabilizing role of intramolecular H-bonds and coulombic interactions for single molecules was shown. The influence of media results in the competition for formation of inter and intramolecular H-bonds and for coulombic interactions. High competitive media, eg. water, diminishes alpha-helix stability.

Electricity↗