Plasma methionine depletion and pharmacokinetic properties in mice of methionine γ-lyase from Citrobacter freundii, Clostridium tetani and Clostridium sporogenes.

PK studies were carried out after a single i.v. administration of 500 and 1000 U/kg by measuring of MGL activity in plasma samples.

Biological microchip for a simultaneous quantitative immunoassay of tumor markers in human serum.

The biochip was constructed for simultaneous assay of total and free prostate-specific antigen, alpha-fetoprotein, cancer embryonic antigen, human chorionic gonadotropin, and neuron-specific enolase. These biochips represent an array of gel elements with covalently immobilized proteins. The major analytic characteristics of the developed method were obtained.

Detection of rifampicin-resistant Mycobacterium tuberculosis strains by hybridization and polymerase chain reaction on a specialized TB-microchip.

Two alternative methods for identification of rifampicin-resistant strains of Mycobacterium tuberculosis on biological microchips are developed. The methods are based on detection of point mutations and other rearrangements in the rpoB gene region determining rifampicin resistance. Hybridization on TB-microchip detects 30 mutant variants of DNA in rifampicin-resistant strains (about 95% of all resistant forms).

[Stability of human immunodeficiency virus to azidothymidine. II. Kinetic characteristics of "AZT-resistant" mutant forms of reverse transcriptase].

Prolonged treatment of AIDS patients with azidothymidine results in the development of resistance to the drug which correlates with the appearance of point mutations in the reverse transcriptase (RT) coding region within the HIV-1 pol gene. Kinetic studies of interactions of wild type RT and its mutants harbouring the above mutations with substrates and azidothymidine 5'-triphosphate (AZTTP) have been carried out. The complete mutant containing all the above described mutations possess the highest resistance on all the templates tested.

[Localization in the body of the mobile element MDG1 of 2 regions specifically binding with Drosophila nuclear proteins].

Two regions in mdg1 mobile element's body can specifically bind nuclear proteins of Drosophila melanogaster, as demonstrated by the method of retention of DNA-protein complexes of nitrocellulose filters. The first region is situated in the 5'-end part of mdg1, 1 kb downstream the site of initiation of transcription and contains long oligo (A) blocks (from 14 to 30 nucleotides) in the coding chain. The second region is localized near the 3'-LTR and consists of tandem 14-nucleotide repeats and a palindrome, destruction of which leads to weaker binding.