Abstract:
:Biofilm-produced and commercially-purified a- and b-glucosidase and alkaline phosphatase were subjected to different spectral portions of natural and artificial light and exposed to various humic substances to elucidate their impact on enzyme activities. Photochemical degradation of all enzymes occurred under different portions of the light spectrum. UVB irradiance produced the greatest overall photochemical degradation of enzymes, with significant rates occurring with UVA and PAR irradiance. The complexation of enzymes with humic substances resulted in inhibition, stabilization, and photochemical protection of the enzyme. Inhibition of enzyme activity occurred via reductions in overall enzyme activity in the presence of humic substances. However, humic-enzyme complexation also resulted in stabilization by restricting enzyme degradation while retaining high activities. Enzymes exposed to natural and artificial light sources had significantly lower reductions in enzyme activities in the presence of humic substances, which indicates that humic-enzyme complexes may protect enzymes from light-induced photochemical degradation. Bacterial surface-bound a- and b-glucosidase activities were significantly reduced in the presence of humic substances. Photosynthetically induced pH changes within biofilm communities can cause large reductions in a- and b-glucosidase activities while enhancing the hydrolytic activity of alkaline phosphatase.
journal_name
Microb Ecoljournal_title
Microbial ecologyauthors
Espeland EM,Wetzel RGdoi
10.1007/s00248-001-1023-7keywords:
subject
Has Abstractpub_date
2001-12-01 00:00:00pages
572-585issue
4eissn
0095-3628issn
1432-184Xjournal_volume
42pub_type
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