A chemotaxis cluster from Agrobacterium tumefaciens.
We report the DNA sequence of a 9.6-kb region of the Agrobacterium tumefaciens chromosome containing a putative 8-kb chemotaxis operon. The putative operon begins with orf1, whose predicted protein product shows strong sequence identity to methyl-accepting chemotaxis proteins (MCPs), followed by orf2, cheY1, cheA, cheR, cheB, cheY2, orf9, orf10. All of the identified homologues show a high degree of sequence conservation with their counterparts in the che operons from Sinorhizobium meliloti and Rhodobacter sphaeroides, and are arranged in a similar order. Mutations in orf1 and cheA result in impaired chemotaxis, whereas deletion of orf10, appears to have no effect on chemotaxis or motility. Although the putative operon does not contain a cheW homologue, heterologous probing and PCR using consensus primers indicates that cheW maps elsewhere in the Agrobacterium genome.
Department of Biological Sciences, University of Durham, South Road, Durham DH1 3LE, UK.
E L
EL
Wright
W J
WJ
Deakin
C H
CH
Shaw
D016960:Agrobacterium tumefaciens / Q000235:genetics*; D001426:Bacterial Proteins / Q000235:genetics; D002633:Chemotaxis / Q000235:genetics*; D005798:Genes, Bacterial; D008565:Membrane Proteins / Q000235:genetics; D000072236:Methyl-Accepting Chemotaxis Proteins; D005810:Multigene Family / Q000235:genetics*; D016297:Mutagenesis, Site-Directed; D010641:Phenotype
D001426:Bacterial Proteins; D008565:Membrane Proteins; D000072236:Methyl-Accepting Chemotaxis Proteins