Purification and characterization of an endoglucanase from the cellulosomes (multicomponent cellulase complexes) of Clostridium thermocellum.
A subunit with carboxymethyl cellulase (CMCase) activity was isolated from the cellulosomes of Clostridium thermocellum after dissociation of the cellulosomes by a mild sodium dodecyl sulfate (SDS) treatment. The subunit displayed only one protein band of 51 kDa on SDS-polyacrylamide gel electrophoresis (SDS-PAGE), but after boiling with SDS it had 3 bands of 60, 56, and 48 kDa. Prolonged incubation with SDS changed the subunit to display exclusively the 48-kDa band after boiling. The 51-kDa subunit was presumably a partially denatured form, and differentiated into 3 species with apparent M(r) of 60, 56, and 48 k through deglycosylation in SDS solution. Enzymatic properties of the 51-kDa subunit resembled those of the endoglucanase A which was purified from the culture fluid and from a E. coli clone with exceptions of temperature and pH optima.
Chugoku National Agricultural Experiment Station, Hiroshima, Japan.
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Mori
D000595:Amino Acid Sequence; D000596:Amino Acids / Q000032:analysis; D002241:Carbohydrates / Q000032:analysis / Q000494:pharmacology; D002480:Cellulase; D002850:Chromatography, Gel; D003013:Clostridium / Q000201:enzymology*; D004591:Electrophoresis, Polyacrylamide Gel; D006026:Glycoside Hydrolases / Q000037:antagonists & inhibitors / Q000737:chemistry* / Q000302:isolation & purification; D006863:Hydrogen-Ion Concentration; D008969:Molecular Sequence Data; D008970:Molecular Weight; D013379:Substrate Specificity; D013696:Temperature
D000596:Amino Acids; D002241:Carbohydrates; D006026:Glycoside Hydrolases; D002480:Cellulase; C019826:carboxymethylcellulase