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Detection of endogenous β-glucuronidase activity in Aspergillus niger

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  • Applied Microbial and Cell Physiology
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Abstract

An endogenous β-glucuronidase that hydrolyses the chromogenic substrate 5-bromo-4-chloro-3-indolyl-β-d-glucuronide (X-gluc) in Aspergillus niger is reported. The activity was induced when the fungus was grown in media containing xylan, but was either very low, or absent, when grown on glucose. Endogenous β-glucuronidase was primarily located in newly formed hyphae, and was apparent at pH values between 3 and 6. Hydrolysis of X-gluc was sensitive to the inhibitor d-saccharic acid 1,4-lactone and was irreversibly inactivated by heating. The bacterial uidA β-glucuronidase reporter gene was strongly expressed in the hyphae of transformed A. niger but, in contrast to the endogenous activity, the enzyme was also active at pH 7–8.5. Histochemical localization of uidA expression in A. niger, without interference from the endogenous β-glucuronidase activity, was achieved by staining at this pH.

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Gottschalk, T.E., Nielsen, J.E. & Rasmussen, P. Detection of endogenous β-glucuronidase activity in Aspergillus niger . Appl Microbiol Biotechnol 45, 240–244 (1996). https://doi.org/10.1007/s002530050677

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  • DOI: https://doi.org/10.1007/s002530050677

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