Thermostable cellobiohydrolase from the thermophilic eubacterium Thermotoga sp. strain FjSS3-B.1. Purification and properties.
Exo-1,4-beta-cellobiohydrolase (EC 3.2.1.91) was isolated from the culture supernatant of Thermotoga sp. strain FjSS3-B.1, an extremely thermophilic eubacterium that grows optimally at 80 degrees C. The enzyme was purified to homogeneity as determined by SDS/PAGE and has an Mr of 36,000. The enzyme is the most thermostable cellulase reported to date, with a half-life at 108 degrees C of 70 min in buffer. In a 40 min assay, maximal activity was recorded at 105 degrees C. Cellobiohydrolase from strain FjSS3-B.1 is active against amorphous cellulose and CM-cellulose but only effects limited hydrolysis of filter paper or Sigmacell 20. The only product identified by h.p.l.c. is the disaccharide cellobiose. The enzyme has a pH optimum around neutral and is stabilized by the presence of 0.8 M-NaCl.
Ruttersmith
L D
LD
Thermophile Research Unit, University of Waikato, Hamilton, New Zealand.
Daniel
R M
RM
D002384:Catalysis; D002482:Cellulose / Q000378:metabolism*; D043366:Cellulose 1,4-beta-Cellobiosidase; D006026:Glycoside Hydrolases / Q000737:chemistry / Q000302:isolation & purification*; D006089:Gram-Negative Anaerobic Bacteria / Q000201:enzymology*; D006358:Hot Temperature; D006863:Hydrogen-Ion Concentration; D013379:Substrate Specificity
D002482:Cellulose; D006026:Glycoside Hydrolases; D043366:Cellulose 1,4-beta-Cellobiosidase