Characterization of a thermostable endo-beta-1,4-D-galactanase from the hyperthermophile Thermotoga maritima. 2006

Hong Yang, and Hitomi Ichinose, and Makoto Yoshida, and Mitsutoshi Nakajima, and Hideyuki Kobayashi, and Satoshi Kaneko
National Food Research Institute, Ibaraki, Japan.

A putative endo-beta-1,4-D-galactanase gene of Thermotoga maritima was cloned and overexpressed in Escherichia coli. The recombinant enzyme hydrolyzed pectic galactans and produced D-galactose, beta-1,4-D-galactobiose, beta-1,4-D-galactotriose, and beta-1,4-D-galactotetraose. The enzyme displayed optimum activity at 90 degrees C and pH 7.0. It was slowly inactivated above pH 8.0 and below pH 5.0 and stable at temperatures up to 80 degrees C.

UI MeSH Term Description Entries
D011198 Solanum tuberosum A plant species of the genus SOLANUM, family SOLANACEAE. The starchy roots are used as food. SOLANINE is found in green parts. Potatoes,Potato,Solanum tuberosums,tuberosum, Solanum,tuberosums, Solanum
D004795 Enzyme Stability The extent to which an enzyme retains its structural conformation or its activity when subjected to storage, isolation, and purification or various other physical or chemical manipulations, including proteolytic enzymes and heat. Enzyme Stabilities,Stabilities, Enzyme,Stability, Enzyme
D005685 Galactans Polysaccharides composed of repeating galactose units. They can consist of branched or unbranched chains in any linkages. Galactan,Polygalactose,Polygalactoses
D006026 Glycoside Hydrolases Any member of the class of enzymes that catalyze the cleavage of the glycosidic linkage of glycosides and the addition of water to the resulting molecules. Endoglycosidase,Exoglycosidase,Glycohydrolase,Glycosidase,Glycosidases,Glycoside Hydrolase,Endoglycosidases,Exoglycosidases,Glycohydrolases,Hydrolase, Glycoside,Hydrolases, Glycoside
D006863 Hydrogen-Ion Concentration The normality of a solution with respect to HYDROGEN ions; H+. It is related to acidity measurements in most cases by pH pH,Concentration, Hydrogen-Ion,Concentrations, Hydrogen-Ion,Hydrogen Ion Concentration,Hydrogen-Ion Concentrations
D006868 Hydrolysis The process of cleaving a chemical compound by the addition of a molecule of water.
D013696 Temperature The property of objects that determines the direction of heat flow when they are placed in direct thermal contact. The temperature is the energy of microscopic motions (vibrational and translational) of the particles of atoms. Temperatures
D020124 Thermotoga maritima A rod-shaped bacterium surrounded by a sheath-like structure which protrudes balloon-like beyond the ends of the cell. It is thermophilic, with growth occurring at temperatures as high as 90 degrees C. It is isolated from geothermally heated marine sediments or hot springs. (From Bergey's Manual of Determinative Bacteriology, 9th ed)

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