Cloning, expression and characterization of a thermostable exo-beta-D-glucosaminidase from the hyperthermophilic archaeon Pyrococcus horikoshii.

An exo-beta-D-glucosaminidase gene (PH0511) was cloned from the hyperthermophilic archaeon, Pyrococcus horikoshii, and expressed in Escherichia coli. The purified protein showed a strong exo-beta-D: -glucosaminidase activity by TLC analysis. DTT (50 mM) had little effect on its homodimeric structure during SDS-PAGE. The enzyme was optimally active at 90 degrees C (over 20 min) and pH 6. It had a half-life of 9 h at 90 degrees C and is the most thermostable glucosaminidase described up to now. The activity was not inhibited by ethanol, 2-propanol, DMSO, PEG-400, denaturing agents SDS (5%, w/v), urea, guanidine hydrochloride (5 M) and Mg(2+), Mn(2+), Co(2+), Ca(2+), Sr(2+), Ni(2+) (at up to 10 mM).