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Purification and characterisation of xylitol dehydrogenase from Neurospora crassa NCL communication No. 6347

Abstract The purification and characterisation of one of the key enzymes in the conversion of xylose to ethanol, xylitol dehydrogenase (XD), from Neurospora crassa is reported. This organism has the unique ability to directly convert biomass to ethanol. The enzyme was purified 81-fold by fractional...

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Published in:FEMS microbiology letters 1997-01, Vol.146 (1), p.79-83
Main Authors: Phadtare, S.U, Rawat, U.B, Rao, M.B
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description Abstract The purification and characterisation of one of the key enzymes in the conversion of xylose to ethanol, xylitol dehydrogenase (XD), from Neurospora crassa is reported. This organism has the unique ability to directly convert biomass to ethanol. The enzyme was purified 81-fold by fractional ammonium sulfate precipitation, column chromatography on DEAE-cellulose, Sephacryl S-200 and β-NAD agarose. The purified enzyme had a native molecular mass of 87 kDa (gel filtration) and was composed of two identical subunits of molecular mass 43.6 kDa (SDS-PAGE). The enzyme was most active at pH 8.4 and at 28°C. It was most stable at pH 7 and at 4°C. It was activated by Mg2+ and stabilised by Ca2+, Mg2+ and Mn2+. It showed activity towards xylitol and sorbitol, the respective Kms being 28.5 and 100 mM and the Km for NAD was 0.7 mM.
doi_str_mv 10.1111/j.1574-6968.1997.tb10174.x
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identifier ISSN: 0378-1097
ispartof FEMS microbiology letters, 1997-01, Vol.146 (1), p.79-83
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1574-6968
language eng
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source Oxford Journals Online
subjects Ammonium
Ammonium sulfate
Calcium
Calcium ions
Cellulose
Column chromatography
Dehydrogenase
Dehydrogenases
Enzymes
Ethanol
Gel electrophoresis
Gel filtration
Magnesium
Microbiology
NAD
Neurospora
Neurospora crassa
pH effects
Purification
Sodium lauryl sulfate
Sorbitol
Xylitol
Xylitol dehydrogenase
Xylose
title Purification and characterisation of xylitol dehydrogenase from Neurospora crassa NCL communication No. 6347
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