Abstract:
:The biogenesis of the bacterial flagellum and chemotaxis apparatus in both Escherichia coli and Caulobacter crescentus requires the ordered expression of over 40 genes whose expression is controlled by a trans-acting regulatory hierarchy. In C. crescentus, additional control mechanisms ensure that the transcription of these genes is initiated at the correct time in the cell cycle. We demonstrate here that two flagellar genes, flaE and flaY, whose products function in trans to modulate the level of transcription of other flagellar genes, are themselves temporally controlled. DNA sequence analysis of the 3413 base-pairs encompassing the flaE and flaY coding sequences and the 5' regulatory region showed that flaE encodes a protein of 16,000 Mr and flaY a protein of 17,000 Mr. Evidence that flaE and flaY are transcribed as a polycistronic message includes (1) the polar effect of Tn5 insertions; (2) deletion analysis showing that the flaE promoter is essential for complementation of both flaE and flaY alleles; and (3) nuclease S1 assays showing protection of a transcript spanning both genes. The transcript start site in front of flaE was determined and the -10 region conforms to the E. coli sigma 28 promoter consensus sequence. Nuclease S1 analysis also revealed a protected fragment whose size was consistent with a transcript initiating in vivo at a consensus "nif" promoter sequence in front of the flaY gene. The entire promoter region and an upstream consensus sequence that might be a regulatory element for the flaY gene lies within the carboxyl-terminal coding sequence of the flaE gene.
journal_name
J Mol Bioljournal_title
Journal of molecular biologyauthors
Kaplan JB,Dingwall A,Bryan R,Champer R,Shapiro Ldoi
10.1016/0022-2836(89)90365-3subject
Has Abstractpub_date
1989-01-05 00:00:00pages
71-83issue
1eissn
0022-2836issn
1089-8638pii
0022-2836(89)90365-3journal_volume
205pub_type
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