Tryptophan indole-lyase from Proteus vulgaris: kinetic and spectral properties

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...

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Bibliographic Details
Published in:Biochemistry (Moscow) 2002-10, Vol.67 (10), p.1189-1196
Main Authors: Zakomirdina, L N, Kulikova, V V, Gogoleva, O I, Dementieva, I S, Faleev, N G, Demidkina, T V
Format: Article
Language:English
Subjects:
Amino acids
Binding Sites
Catalysis
Circular Dichroism
Coenzymes - metabolism
E coli
Electrophoresis, Polyacrylamide Gel
Enzyme Inhibitors - chemistry
Enzyme Inhibitors - metabolism
Enzymes
Escherichia coli
Holoenzymes - chemistry
Holoenzymes - metabolism
Kinetics
Molecular Structure
Proteus vulgaris
Proteus vulgaris - enzymology
Tryptophanase - chemistry
Tryptophanase - metabolism
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Summary: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.
ISSN:0006-2979
1608-3040
DOI:10.1023/A:1020975610046