Cellobiose uptake in the hyperthermophilic archaeon Pyrococcus furiosus is mediated by an inducible, high-affinity ABC transporter.
The hyperthermophilic archaeon Pyrococcus furiosus can utilize different beta-glucosides, like cellobiose and laminarin. Cellobiose uptake occurs with high affinity (K(m) = 175 nM) and involves an inducible binding protein-dependent transport system. The cellobiose binding protein (CbtA) was purified from P. furiosus membranes to homogeneity as a 70-kDa glycoprotein. CbtA not only binds cellobiose but also cellotriose, cellotetraose, cellopentaose, laminaribiose, laminaritriose, and sophorose. The cbtA gene was cloned and functionally expressed in Escherichia coli. cbtA belongs to a gene cluster that encodes a transporter that belongs to the Opp family of ABC transporters.
Koning
S M
SM
Department of Microbiology, Groningen Biomolecular Sciences and Biotechnology Institute, University of Groningen, 90750 AA Haren, The Netherlands.
Elferink
M G
MG
Konings
W N
WN
Driessen
A J
AJ
D018528:ATP-Binding Cassette Transporters / Q000235:genetics / Q000302:isolation & purification* / Q000378:metabolism*; D002475:Cellobiose / Q000378:metabolism*; D003001:Cloning, Molecular; D004591:Electrophoresis, Polyacrylamide Gel; D004926:Escherichia coli; D007700:Kinetics; D008970:Molecular Weight; D019711:Pyrococcus / Q000378:metabolism*
D018528:ATP-Binding Cassette Transporters; D002475:Cellobiose