Structural basis for thermostability of beta-glycosidase from the thermophilic eubacterium Thermus nonproteolyticus HG102.

Structural Basis for Thermostability of -Glycosidase from the Thermophilic Eubacterium Thermus nonproteolyticus HG102

Overexpression, purification, crystallization and preliminary crystallographic studies on a thermostable beta-glycosidase from Thermus nonproteolyticus HG102.

A thermostable beta-glycosidase (Tn-gly) from Thermus nonproteolyticus HG102 has been cloned and overexpressed in Escherichia coli. The recombinant enzyme, with a molecular mass of 48.9 kDa, was purified to homogeneity. It can hydrolyze a wide range of oligosaccharides and perform transglycosylation. Crystals of the recombinant enzyme were grown by the hanging-drop vapour-diffusion technique wi...

Export of Thermus thermophilus cytoplasmic beta-glycosidase via the E. coli Tat pathway.

The Tat pathway is distinct from the Sec machinery given its unusual capacity to export folded proteins, which contain a twin-arginine (RR) signal peptide, across the plasma membrane. The functionality of the Tat pathway has been demonstrated for several Gram-negative and Gram-positive mesophilic bacteria. To assess the specificity of the Tat system, and to analyze the capacity of a mesophilic ...

An extremely thermostable xylanase from the thermophilic eubacterium Thermotoga.

Endo-1,4-beta-xylanase (EC 3.2.1.8) was isolated from the culture supernatant of Thermotoga sp. strain FjSS3-B.1, an extremely thermophilic anaerobic eubacterium which grows optimally at 80 degrees C. Activity was purified 165-fold by anion-exchange and hydroxyapatite chromatography. The enzyme has an Mr of 31,000 as determined by SDS/PAGE and 35,000 by analytical gel filtration. The optima for...

Gene cloning and enzymatic properties of hyperthermostable beta-glycosidase from Thermus thermophilus HJ6.

A microorganism (strain HJ6) producing extracellular beta-glycosidase was isolated from a hot springs located in Arima-cho, Hyogo, Japan. The cells were long-rods (2-4 microm) about 0.4 microm in diameter, and formed yellow-colored colonies, like most other strains of the genus Thermus. The pH and temperature for optimal growth were 6.5 and 80 degrees C. Thus, the HJ6 strain displayed a higher ...