PARTIAL CHARACTERIZATION OF BETA-GLUCOSIDASE ACTIVITY PRODUCED BY KLUYVEROMYCES-MARXIANUS IMB3 DURING GROWTH ON CELLOBIOSE-CONTAINING MEDIA AT 45-DEGREES-C

N BARRON, R Marchant, L MCHALE, Anthony McHale

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

We report- the partial characterization of a beta-glucosidase produced during growth of the thermotolerant yeast, K. marxianus IMB3 on lactose-containing media at 45 degrees C. The enzyme had Km values of 1.1 mM and 14.8 mM, for the substrates p-nitrophenyl-beta-D-glucoside and cellobiose, respectively. The enzyme had a pH optimum of 5.5 and was optimally active at 50 degrees C. It was stable up to 125 hours at 25 degrees C and 35 degrees, with half-lives of 45 hours and 2 hours at 45 degrees C and 50 degrees C, respectively. inactivated by Hg2+. Ethanol concentrations [1-10% (v/v)] had little effect an activity. Glucose (20 mM) caused inhibition when p-nitrophenyl-beta-D-glucoside was used as substrate, whereas lactose at similar concentrations had no effect.
Original languageEnglish
Pages (from-to)1047-1050
JournalBiotechnology Letters
Volume17
Issue number10
Publication statusPublished - Oct 1995

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