CHARACTERIZATION OF AN INTRACELLULAR BETA-GLUCOSIDASE FROM STREPTOMYCES-RETICULI
Autor(en): | HEUPEL, C SCHLOCHTERMEIER, A SCHREMPF, H |
Stichwörter: | BETA-GLUCOSIDASES; Biotechnology & Applied Microbiology; CELLOBIOSE; CELLULASE; CLOSTRIDIUM-THERMOCELLUM; ENZYMES; METABOLISM; PROTEINS; PURIFICATION; SPOROTRICHUM-PULVERULENTUM; STREPTOMYCES-RETICULI | Erscheinungsdatum: | 1993 | Herausgeber: | BUTTERWORTH-HEINEMANN | Journal: | ENZYME AND MICROBIAL TECHNOLOGY | Volumen: | 15 | Ausgabe: | 2 | Startseite: | 127 | Seitenende: | 132 | Zusammenfassung: | Streptomyces reticuli hydrolyzes cellobiose to glucose by mycelia-associated, extra- and intracellular beta-glucosidase activities during cultivation with crystalline cellulose (Avicel) or cellobiose as carbon source. One intracellular beta-glucosidase was purified to near homogeneity by the use of a fast protein liquid chromatography system combined with several ion-exchange and hydrophobic-interaction columns. The unglycosylated enzyme has an apparent molecular weight of 50 kDa and an isoelectric point of 4.5, and shows optimal activity at pH 7 and 40-degrees-C. It can be stimulated by CaCl2, MgSO4, or cellobiose, and is inhibited by glucose, glucono-lactone, or histidine, but not by imidazole. The beta-glucosidase hydrolyzes p-nitrophenyl-beta-D-gluco-pyranoside, cellobiose, and cellodextrins. The release of glucose from cellooligomers decreases in proportion to their lengths. |
ISSN: | 01410229 | DOI: | 10.1016/0141-0229(93)90036-2 |
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geprüft am 17.05.2024