creators_name: Biswas, Dipanwita
creators_name: Datt, Manish
creators_name: Ganesan, K
creators_name: Mondal, Alok K
type: article
datestamp: 2011-12-08 18:59:01
lastmod: 2012-04-02 06:43:16
metadata_visibility: show
title: Cloning and characterization of thermotolerant xylitol dehydrogenases from yeast Pichia angusta.
ispublished: pub
subjects: QR
full_text_status: restricted
keywords: Xylitol dehydrogenase . Medium-chain alcohol
dehydrogenase . Thermotolerant enzyme . Pichia angusta
note: Copyright of this article belongs to Springer Science
abstract: Pichia angusta (syn. Hansenula polymorpha) represents one of the rare yeast that can grow and ferment both xylose and glucose at higher temperature (50°C). However, little is known about the enzymes involved in xylose utilization from this species. Previous studies indicated the presence of one xylose reductase and two xylitol dehydrogenase genes in P. angusta. In this study, we have expressed both xylitol dehydrogenases (PaXdh1p and PaXdh2p) in Escherichia coli and purified them as 6X-Histidine-tagged proteins. Biochemical characterization of the recombinant proteins reveals that both PaXdh1p and PaXdh2p are thermotolerant enzymes. PaXdh2p contains a catalytic and a structural Zn atom. However, the structural Zn atom is not present in PaXdh1p. Both enzymes also differ in their affinity for the substrate as well as in the catalytic efficiency. Through mutagenesis and modeling approaches, we have also identified residues important for catalysis and substrate binding.
date: 2010-12
date_type: published
publication: Applied microbiology and biotechnology
volume: 88
number: 6
publisher: Springer Science
pagerange: 1311-20
refereed: TRUE
issn: 1432-0614
official_url: http://www.springerlink.com/content/45j26h0434623735/fulltext.pdf
related_url_url: http://www.springerlink.com/content/45j26h0434623735/fulltext.pdf
related_url_type: pub
citation:   Biswas, Dipanwita and Datt, Manish and Ganesan, K and Mondal, Alok K  (2010) Cloning and characterization of thermotolerant xylitol dehydrogenases from yeast Pichia angusta.  Applied microbiology and biotechnology, 88 (6).  pp. 1311-20.  ISSN 1432-0614     
document_url: http://crdd.osdd.net/open/501/1/mondal10.pdf