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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Ohta, N. Feng, J. Ninfa, A. J. Benson, A. K. Ramakrishnan, G. Newton, A. |
| Description | Author Affiliation: Benson AK ( Department of Molecular Biology, Princeton University, NJ 08544.); |
| Abstract | The flagellar genes (fla genes) in Caulobacter crescentus are organized into a regulatory hierarchy of four levels, I-IV, in which transcription of the class III and class IV genes late in the cell cycle from sigma 54-dependent promoters depends on expression of the class II genes above them. Timing of fla gene expression has been attributed to sequential activation and repression by specific transcription factors. Here we report that purified FlbD activates transcription in vitro from the sigma 54-dependent class III flbG promoter and repress transcription from the class II fliF promoter by binding to ftr (flagellar transcription regulator) sequence elements required for their transcriptional regulation in vivo. The FlbD protein makes symmetrical base-specific contacts at three highly conserved guanine nucleotides in each half site of ftr1 and ftr1* at flbG and the single ftr4 site at fliF. The dual function of FlbD in activation of class III genes and repression of the class II fliF promoter is consistent with a central role of FlbD as a switch protein mediating the transition from level II to level III fla gene expression. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 11 |
| Volume Number | 91 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1994-06-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Bacterial Proteins Metabolism Caulobacter Crescentus Genetics Flagella Gene Expression Regulation, Bacterial Regulatory Sequences, Nucleic Acid Transcriptional Activation Cell Cycle DNA, Bacterial Molecular Sequence Data Promoter Regions, Genetic Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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