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Differential carbon catabolite repression of two intracellular β-glucosidases in Aspergillus nidulans

Published online by Cambridge University Press:  01 April 1997

KI-SUN KWON
Affiliation:
Department of Microbiology, College of Natural Sciences, Seoul National University, Seoul, Korea
JAE HOON LEE
Affiliation:
Present address: Korea Research Institute of Bioscience & Biotechnology, Korea Institute of Science and Technology, P.O. Box 115 Yusong, Taejon 305-600, South Korea. Department of Microbiology, College of Natural Sciences, Seoul National University, Seoul, Korea
YUNG CHIL HAH
Affiliation:
Department of Microbiology, College of Natural Sciences, Seoul National University, Seoul, Korea
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Abstract

Two intracellular β-glucosidases, designated P-I and P-II, were found in Aspergillus nidulans. While both enzymes were subject to carbon catabolite repression, they exhibited different degrees of repression. P-I biosynthesis was repressed only by a strongly repressing carbon source such as glucose. By contrast, P-II biosynthesis was repressed by even weakly repressing carbon sources such as acetate or lactose. Repression of both was relieved in the creAd mutant strain, except for the strong repression of P-II biosynthesis which was still repressed by glucose. Thus P-II biosynthesis seems to be more sensitive to carbon catabolite repression than P-I.

Type
Research Article
Copyright
The British Mycological Society 1997

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