Author:
Ahonkhai Ijeoma,Kamekura Masahiro,Kushner Donn J.
Abstract
The aspartate transcarbamylase (ATCase) in cell-free extracts of the moderately halophilic eubacterium, Vibrio costicola, was stable in 1.5 M NaCl, but not in 0.5 M NaCl on prolonged storage at 4 °C in concentrated extracts. At lower salt concentrations, activity was lost rapidly. ATCase activity was optimal at about 1.5 M NaCl or 1.0 M KCl, although high activity was detected at 0.15 M NaCl. In the presence of 0.03 M aspartate both succinate and maleate inhibited ATCase activity. CTP inhibited the activity of the enzyme at low salt concentrations (0.15 to 0.3 M). Much less inhibition occurred at higher salt concentrations. Precipitating the enzyme with ammonium sulphate resulted in loss of CTP inhibition. The ATCase of V. costicola differs from those of a nonhalophile (Saccharomyces cerevisiae) and an extremely halophilic archaebacterium (Halobacterium cutirubrum) in its salt-response patterns of activity and regulation.Key words: halophilic, aspartate transcarbamylase, Vibrio costicola.
Publisher
Canadian Science Publishing
Subject
Cell Biology,Molecular Biology,Biochemistry
Cited by
7 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献
1. Halophilic Bacteria: Potentials and Applications in Biotechnology;Sustainable Development and Biodiversity;2015
2. Nucleotide Metabolism;Helicobacter pylori;2014-04-09
3. Properties of Halophilic Proteins;Cellular Origin, Life in Extreme Habitats and Astrobiology;2003
4. Characterization of Nucleoside Diphosphate Kinase from Moderately Halophilic Eubacteria;Bioscience, Biotechnology, and Biochemistry;2001-01
5. Biology of Moderately Halophilic Aerobic Bacteria;Microbiology and Molecular Biology Reviews;1998-06