Enzymatic Properties and Intracellular Localization of the Novel Trichoderma Reesei Beta-glucosidase BGLII (cel1A)

Overview

Journal Appl Environ Microbiol

Specialties Environmental Health
Microbiology

Date 2002 Aug 30

PMID 12200312

Citations 45

Authors

Markku Saloheimo

Juha Kuja-Panula

Erkko Ylosmaki

Michael Ward

Merja Penttila

Affiliations

Soon will be listed here.

Abstract

This paper describes the characterization of an intracellular beta-glucosidase enzyme BGLII (Cel1a) and its gene (bgl2) from the cellulolytic fungus Trichoderma reesei (Hypocrea jecorina). The expression pattern of bgl2 is similar to that of other cellulase genes known from this fungus, and the gene would appear to be under the control of carbon catabolite repression mediated by the cre1 gene. The BGLII protein was produced in Escherichia coli, and its enzymatic properties were analyzed. It was shown to be a specific beta-glucosidase, having no beta-galactosidase side activity. It hydrolyzed both cellotriose and cellotetraose. BGLII exhibited transglycosylation activity, producing mainly cellotriose from cellobiose and sophorose and cellobiose from glucose. Antibodies raised against BGLII showed the presence of the enzyme in T. reesei cell lysates but not in the culture supernatant. Activity measurements and Western blot analysis of T. reesei strains expressing bgl2 from a constitutive promoter further confirmed the intracellular localization of this beta-glucosidase.

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