Biosynthesis of isoleucine and valine in mycobacterium tuberculosis H37Rv. II. Purification and properties of acetohydroxy acid isomeras

Allaudeen, HS and Ramakrishnan, T (1970) Biosynthesis of isoleucine and valine in mycobacterium tuberculosis H37Rv. II. Purification and properties of acetohydroxy acid isomeras. In: Archives of Biochemistry and Biophysics, 140 (1). pp. 245-256.

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Abstract

Acetohydroxy acid isomerase (AHA isomerase) was purified about 110-fold and separated from reductase and acetohydroxy acid isomeroreductase. The AHA isomerase was found to be homogeneous by agar and polyacrylamide gel electrophoreses at different pHs. The properties of AHA isomerase have been studied. The purified enzyme showed requirement for l-ascorbic acid and sulfate ions for its activity. Synthetic ascorbic acid sulfate could replace l-ascorbic acid and sulfate. α-Methyllactate and α-ketoisovalerate were found to inhibit AHA isomerase activity competitively whereas l-valine and l-isoleucine had no significant inhibitory effect. p-Hydroxymercuribenzoate inhibited AHA isomerase activity and the inhibition was reversed by β-mercaptoethanol.

Item Type:	Journal Article
Publication:	Archives of Biochemistry and Biophysics
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs to Elsevier Science.
Department/Centre:	Division of Biological Sciences > Microbiology & Cell Biology
Date Deposited:	28 May 2010 06:02
Last Modified:	19 Sep 2010 06:07
URI:	http://eprints.iisc.ac.in/id/eprint/28119

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