Purification and properties of an aryl beta-xylosidase from a cellulolytic extreme thermophile expressed in Escherichia coli.

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dc.contributor.authorHudson, R.C.
dc.contributor.authorSchofield, L.R.
dc.contributor.authorCoolbear, Tim
dc.contributor.authorDaniel, Roy M.
dc.contributor.authorMorgan, Hugh W.
dc.date.accessioned2010-08-31T23:40:02Z
dc.date.available2010-08-31T23:40:02Z
dc.date.issued1991
dc.description.abstractAn aryl beta-xylosidase was purified to homogeneity from an Escherichia coli strain containing a recombinant plasmid carrying a beta-xylosidase (EC 3.2.1.37) gene from the extremely thermophilic anaerobic bacterium isolate Tp8T6.3.3.1 ('Caldocellum saccharolyticum'). It has a pI of 4.3 and shows optimal activity at pH 5.7. The enzyme is highly specific, acting on o- and p-nitrophenyl beta-D-xylopyranosides and minimally on p-nitrophenyl alpha-L-arabinopyranoside. It does not act on xylobiose. The Km for p-nitrophenyl beta-D-xylopyranoside at the optimum pH for activity is 10 mM, and at pH 7.0 is 6.7 mM. Xylose is a competitive inhibitor with Ki 40 mM. Thermal inactivation follows first-order kinetics at 65 and 70 degrees C with t1/2 values of 4.85 h and 40 min respectively. The t1/2 at 70 degrees C is increased 3-fold and 4-fold by the addition of 0.5 mg of BSA/ml and 2 mM-dithiothreitol respectively.en_NZ
dc.identifier.citationHudson, R.C., Schofield, L.R., Coolbear, T., Daniel, R.M. & Morgan, H.W. (1991). Purification and properties of an aryl beta-xylosidase from a cellulolytic extreme thermophile expressed in Escherichia coli. Biochemical Journal, 273(3), 645-650.en_NZ
dc.identifier.urihttps://hdl.handle.net/10289/4497
dc.language.isoen
dc.relation.urihttp://www.biochemj.org/bj/273/bj2730645.htmen_NZ
dc.subjectbeta-xylosidaseen_NZ
dc.titlePurification and properties of an aryl beta-xylosidase from a cellulolytic extreme thermophile expressed in Escherichia coli.en_NZ
dc.typeJournal Articleen_NZ
dspace.entity.typePublication
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