Ribose utilization by the human commensal Bifidobacterium breve UCC2003.
Growth of Bifidobacterium breve UCC2003 on ribose leads to the transcriptional induction of the rbsACBDK gene cluster. Generation and phenotypic analysis of an rbsA insertion mutant established that the rbs gene cluster is essential for ribose utilization, and that its transcription is likely regulated by a LacI-type regulator encoded by rbsR, located immediately upstream of rbsA. Gel mobility shift assays using purified RbsR(His) indicate that the promoter upstream of rbsABCDK is negatively controlled by RbsR(His) binding to an 18 bp inverted repeat and that RbsR(His) binding activity is modulated by D-ribose. The rbsK gene of the rbs operon of B. breve UCC2003 was shown to specify a ribokinase (EC 2.7.1.15), which specifically directs its phosphorylating activity towards D-ribose, converting this pentose sugar to ribose-5-phosphate.
Alimentary Pharmabiotic Centre, Department of Microbiology, University College Cork, Western Road, Cork, Ireland.
Karina
K
Pokusaeva
Ana Rute
AR
Neves
Aldert
A
Zomer
Mary
M
O'Connell-Motherway
John
J
MacSharry
Peter
P
Curley
Gerald F
GF
Fitzgerald
Douwe
D
van Sinderen
D001644:Bifidobacterium / Q000254:growth & development* / Q000378:metabolism*; D004269:DNA, Bacterial / Q000378:metabolism; D024202:Electrophoretic Mobility Shift Assay; D015964:Gene Expression Regulation, Bacterial; D005798:Genes, Bacterial; D005810:Multigene Family; D016254:Mutagenesis, Insertional; D011401:Promoter Regions, Genetic; D011485:Protein Binding; D012097:Repressor Proteins / Q000378:metabolism; D012266:Ribose / Q000378:metabolism*
D004269:DNA, Bacterial; D012097:Repressor Proteins; D012266:Ribose
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