Characterization of Tryptophanase from Vibrio cholerae

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• 作者：Taiyeebah Nuidate ; Natta Tansila…
• 关键词：Tryptophanase ; Vibrio cholerae ; Indole ; Biofilm
• 刊名：Applied Biochemistry and Biotechnology
• 出版年：2015
• 出版时间：January 2015
• 年：2015
• 卷：175
• 期：1
• 页码：243-252
• 全文大小：778 KB
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• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Biotechnology
  Biochemistry
  
• 出版者：Humana Press Inc.
• ISSN：1559-0291

文摘

Tryptophanase (Trpase) is a pyridoxal phosphate (PLP)-dependent enzyme responsible for the production of indole, an important intra- and interspecies signaling molecule in bacteria. In this study, the tnaA gene of Vibrio cholerae coding for VcTrpase was cloned into the pET-20b(+) vector and expressed in Escherichia coli BL21(DE3) tn5:tnaA. Using Ni2+-nitrilotriacetic acid (NTA) chromatography, VcTrpase was purified, and it possessed a molecular mass of ?9?kDa with specific absorption peaks at 330 and 435?nm and a specific activity of 3?U/mg protein. The VcTrpase had an 80?% homology to the Trpase of Haemophilus influenzae and E. coli, but only around 50?% identity to the Trpase of Proteus vulgaris and Porphyromonas gingivalis. The optimum conditions for the enzyme were at pH 9.0 and 45?°C. Recombinant VcTrpase exhibited analogous kinetic reactivity to the EcTrpase with K m and k cat values of 0.612?×-0??M and 5.252?s?, respectively. The enzyme catalyzed S-methyl-l-cysteine and S-benzyl-l-cysteine degradation, but not l-phenylalanine and l-serine. Using a site-directed mutagenesis technique, eight residues (Thr52, Tyr74, Arg103, Asp137, Arg230, Lys269, Lys270, and His463) were conserved for maintaining enzyme catalysis. All amino acid substitutions at these sites either eliminated or remarkably diminished Trpase activity. These sites are thus potential targets for the design of drugs to control the V. cholerae Trpase and to further investigate its functions.