Evidence that cleavage of the precursor enzyme by autocatalysis caused secretion of multiple amylases by Aspergillus niger.

Ravi Kumar, K and Venkatesh, K. S. and Umesh Kumar, S. (2004) Evidence that cleavage of the precursor enzyme by autocatalysis caused secretion of multiple amylases by Aspergillus niger. FEBS letters, 557 (1-3). pp. 239-42. ISSN 0014-5793

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Abstract

The observation that a mutant strain of Aspergillus niger isolated for protease overproduction accumulated Taka-amylase supported an earlier report that processing of the precursor amylase by protease resulted in the secretion of multiple amylases. Studies using a mutant strain revealed that such processing was not due to aspergillopepsin but to autocatalysis by an inherent protease activity of the precursor and glucoamylase. Alignment of protease sequences with glucoamylase showed regions of consensus with serine carboxypeptidase of A. niger. Thus point mutations in this region due to ultraviolet radiation apparently caused the mutant to evolve with enhanced protease activity that degraded the precursor and accumulated Taka-amylase.

Item Type:	Article
Uncontrolled Keywords:	Glucoamylase; Taka-amylase; Carboxypeptidase; Precursor; Aspergillus niger
Subjects:	500 Natural Sciences and Mathematics > 07 Life Sciences > 04 Microbiology > 04 Fungi 500 Natural Sciences and Mathematics > 04 Chemistry and Allied Sciences > 16 Enzyme Chemistry
Divisions:	Food Microbiology
Depositing User:	Food Sci. & Technol. Information Services
Date Deposited:	27 Nov 2008 05:42
Last Modified:	30 May 2012 11:10
URI:	http://ir.cftri.res.in/id/eprint/2045

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