Reaction Mechanisms of Isocitrate Lyase fromRhodopseudomonassp. No. 7
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چکیده
منابع مشابه
Stereochemical Course of the Isocitrate Lyase Reaction.
The formation of glyoxylate and succinate from citrate or cis-aconitate, and the reverse reaction, were first observed by Campbell, Smith, and Eagles (1) in extracts of Pseudomonas aeruginosa. Later, it was established by Smith and Gunsalus (2) and other investigators (3-5) that three-n,-isocitrate is the actual substrate, and that the enzyme, isocitrate lyase, is characteristically induced in ...
متن کاملRole of phosphoenolpyruvate in the NADP-isocitrate dehydrogenase and isocitrate lyase reaction in Escherichia coli.
Phosphoenolpyruvate inhibited Escherichia coli NADP-isocitrate dehydrogenase allosterically (Ki of 0.31 mM) and isocitrate lyase uncompetitively (Ki' of 0.893 mM). Phosphoenolpyruvate enhances the uncompetitive inhibition of isocitrate lyase by increasing isocitrate, which protects isocitrate dehydrogenase from the inhibition, and contributes to the control through the tricarboxylic acid cycle ...
متن کاملIsocitrate lyase from Phycomyces blakesleeanus
Isocitrate lyase was purified from Phycomyces blakesleeanus N.R.R.L. 1555(-). The native enzyme has an Mr of 240000. The enzyme appeared to be a tetramer with apparently identical subunits of Mr 62000. The enzyme requires Mg2+ for activity, and the data suggest that the Mg2+-isocitrate complex is the true substrate and that Mg2+ ions act as a nonessential activator. The kinetic mechanism of the...
متن کاملEffect of glucose on isocitrate lyase in Phycomyces blakesleeanus.
Repression of the synthesis of isocitrate lyase by glucose and/or induction of the synthesis of isocitrate lyase by acetate in Phycomyces blakesleeanus were demonstrated. Both glycerol and ethanol failed to induce isocitrate lyase activity. Furthermore, glucose appeared to cause an in vivo catabolite inactivation of the derepressed enzyme. Isocitrate lyase was inactivated both reversibly and ir...
متن کاملDisappearance of isocitrate lyase enzyme from cells of Chlorella pyrenoidosa.
1. When acetate-adapted cells of Chlorella are suspended in nitrogen-free medium and supplied with glucose, isocitrate lyase activity disappears from the cells at a rate of about 9%/h. This loss of activity is shown to be accompanied by loss of isocitrate lyase protein. 2. When isocitrate lyase activity is assayed in intact cells after freezing and thawing, the rate of loss of activity after ad...
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ژورنال
عنوان ژورنال: Bioscience, Biotechnology, and Biochemistry
سال: 1993
ISSN: 0916-8451,1347-6947
DOI: 10.1271/bbb.57.140