期刊
BIOTECHNOLOGY PROGRESS
卷 27, 期 2, 页码 360-367出版社
WILEY
DOI: 10.1002/btpr.518
关键词
organophosphate hydrolase; amyloid fibril; immobilization; bioremediation; chemical detoxification
资金
- New Zealand Foundation for Research Science, and Technology [C02X0804]
- US Defense Threat Reduction Agency [W911NF-07-1-0073]
- New Zealand Ministry of Business, Innovation & Employment (MBIE) [C02X0804] Funding Source: New Zealand Ministry of Business, Innovation & Employment (MBIE)
Organophosphate hydrolase has potential as a bioremediation and chemical detoxification enzyme, but the problems of reusability and stability need to be addressed to use this enzyme on an industrial scale. Immobilizing the enzyme to a nanoscaffold may help to solve these problems. Amyloid fibrils generated from insulin and crystallin provided a novel nanoscaffold for the immobilization of organophosphate hydrolase, using glutaraldehyde as the crosslinking reagent. Electrophoretic, centrifugation, and temperature stability experiments, together with transmission electron microscopy were undertaken to verify that crosslinking had successfully occurred. The resulting fibrils remained active towards the substrate paraoxon and when immobilized to the insulin amyloid fibrils, the enzyme exhibited a significant (similar to 300%) increase in the relative temperature stability at 40, 45, and 50 degrees C (as measured by comparing the initial enzyme activity to the activity remaining after heating), compared to free enzyme. This confirms that amyloid fibrils could provide a new type of nanoscaffold for enzyme immobilization. (C) 2010 American Institute of Chemical Engineers Biotechnol. Prog., 27: 360-367, 2011
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