Involvement of separate domains of the cellulosomal protein S1 of Clostridium thermocellum in binding to cellulose and in anchoring of catalytic subunits to the cellulosome.
Fragments of the 250 kDa S1 subunit of the Clostridium thermocellum cellulosome were obtained by protease-induced or spontaneous degradation. All detectable fragments, down to a mass of about 30 kDa, retained the ability to bind to 125I-labelled endoglucanase CelD, one of the catalytic subunits of the cellulosome. Several fragments were able to bind both to cellulose and to CelD. However, some fragments that could still bind to CelD did not have the ability to bind to cellulose. Therefore, S1, a putative scaffolding protein of the cellulosome, is likely to carry two separate types of domains, one of which binds to cellulose, while the other type binds to the various catalytic subunits of the complex.
Salamitou
S
S
Unité de Physiologie Cellulaire and URA 1300 CNRS, Département des Biotechnologies, Institut Pasteur, Paris, France.
Tokatlidis
K
K
Béguin
P
P
Aubert
J P
JP
D001426:Bacterial Proteins / Q000378:metabolism*; D002480:Cellulase / Q000378:metabolism*; D002482:Cellulose / Q000378:metabolism*; D003013:Clostridium / Q000378:metabolism*; D004591:Electrophoresis, Polyacrylamide Gel; D010446:Peptide Fragments / Q000378:metabolism; D012697:Serine Endopeptidases
D001426:Bacterial Proteins; D010446:Peptide Fragments; D002482:Cellulose; D002480:Cellulase; D012697:Serine Endopeptidases; C028344:glutamyl endopeptidase