Autor:	Lyudmila N. Zakomirdina, N. G. Faleev, I. S. Dementieva, Olga I. Gogoleva, Tatyana V. Demidkina, Vitalia V. Kulikova
Rok vydání:	2002
Předmět:	chemistry.chemical_classification biology Stereochemistry Tryptophanase Proteus vulgaris General Medicine Reaction intermediate medicine.disease_cause biology.organism_classification Biochemistry Amino acid Non-competitive inhibition Enzyme chemistry medicine Bioorganic chemistry Escherichia coli
Zdroj:	Biochemistry (Moscow). 67:1189-1196
ISSN:	0006-2979
DOI:	10.1023/a:1020975610046
Popis:	An efficient method for purification of recombinant tryptophanase from Proteus vulgaris was developed. Catalytic properties of the enzyme in reactions with L-tryptophan and some other substrates as well as competitive inhibition by various amino acids in the reaction with S-o-nitrophenyl-L-cysteine were studied. Absorption and circular dichroism spectra of holotryptophanase and its complexes with characteristic inhibitors modeling the structure of the principal reaction intermediates were examined. Kinetic and spectral properties of two tryptophanases which markedly differ in their primary structures are compared. It was found that although the spectral properties of the holoenzymes and their complexes with amino acid inhibitors are different, the principal kinetic properties of the enzymes from Proteus vulgaris and Escherichia coli are analogous. This indicates structural similarity of their active sites.
Databáze:	OpenAIRE
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