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Applied and Environmental Microbiology
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General Microbial Ecology

Characterization of β-Glucosidase Activity in Intertidal Marine Sediments

Gary M. King
Gary M. King
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ABSTRACT

Glycoside derivatives of 4-methylumbelliferone (MUF) were used to characterize the polysaccharidase enzyme systems present in sediments from an intertidal mud flat. The formation of highly fluorescent MUF on hydrolysis of the various glycosides was determined at low substrate concentrations (<1 μM) and with short incubation periods (>5 min). The hydrolysis of MUF-β-d-glucose in sediments from depth intervals of 0 to 2 cm was insensitive to the presence of oxygen, dissolved sulfide, and iron; magnesium and calcium were stimulatory, however. A pronounced temperature optimum was observed at 40°C, a salinity optimum at 30‰, and a pH optimum at 8.5. Rates of hydrolysis were completely inhibited by the addition of mercuric chloride and sodium azide, but only partially inhibited by toluene and the specific β-glucosidase inhibitor δ-1,5-gluconolactone. The response to δ-1,5-gluconolactone suggested that about 50% of the observed hydrolysis of MUF-β-d-glucoside was due to exo- and endoglucanases. A wide variety of hydrolytic activities was observed, with at least some nonspecificity occurring in the case of MUF-β-d-fucoside. Depth profiles indicated maximal activity in surface sediments with a rapid decline below 2 cm. MUF-glycosides provided a convenlent tool for initial analyses of the dynamics and controls of polymer hydrolysis in marine sediments.

FOOTNOTES

  • ↵† Contribution no. 180 from the I. C. Darling Center and 86-02 from the Maine Benthic Oceanography Group.

  • Copyright © 1986, American Society for Microbiology
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Characterization of β-Glucosidase Activity in Intertidal Marine Sediments
Gary M. King
Applied and Environmental Microbiology Feb 1986, 51 (2) 373-380; DOI:

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Characterization of β-Glucosidase Activity in Intertidal Marine Sediments
Gary M. King
Applied and Environmental Microbiology Feb 1986, 51 (2) 373-380; DOI:
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