Rok
- Description: repressor of comK, nucleoid associated protein that serves to help repress expression of A+T-rich genes, many of which appear to have been acquired by horizontal gene transfer
| Gene name | rok |
| Synonyms | ykuW |
| Essential | no |
| Product | transcriptional repressor |
| Function | regulation of genetic competence |
| MW, pI | 21 kDa, 9.701 |
| Gene length, protein length | 573 bp, 191 aa |
| Immediate neighbours | ykuV, yknT |
| Get the DNA and protein sequences (Barbe et al., 2009) | |
Genetic context 
This image was kindly provided by SubtiList
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Contents
The gene
Basic information
- Locus tag: BSU14240
Phenotypes of a mutant
higher excision rate of the conjugative transposon ICEBs1 PubMed
Database entries
- DBTBS entry: [1]
- SubtiList entry: [2]
Additional information
Categories containing this gene/protein
genetic competence, transcription factors and their control
The protein
Basic information/ Evolution
- Catalyzed reaction/ biological activity: binds to extended regions of the B. subtilis genome that are characterized by a high A+T content and are known or believed to have been acquired by horizontal gene transfer PubMed
- Protein family:
- Paralogous protein(s):
Extended information on the protein
- Kinetic information:
- Domains:
- Modification:
- Cofactor(s):
- Effectors of protein activity:
- Interactions:
- Localization:
Database entries
- Structure:
- UniProt: O34857
- KEGG entry: [3]
- E.C. number:
Additional information
Expression and regulation
- Operon: rok PubMed
- Regulation:
- Regulatory mechanism:
- Additional information:
Biological materials
- Mutant:
- Expression vector:
- lacZ fusion:
- GFP fusion:
- two-hybrid system:
- Antibody:
Labs working on this gene/protein
Your additional remarks
References
Reviews
Daniel Schultz, Peter G Wolynes, Eshel Ben Jacob, José N Onuchic
Deciding fate in adverse times: sporulation and competence in Bacillus subtilis.
Proc Natl Acad Sci U S A: 2009, 106(50);21027-34
[PubMed:19995980]
[WorldCat.org]
[DOI]
(I p)
Original Publications
Akos T Kovács, Oscar P Kuipers
Rok regulates yuaB expression during architecturally complex colony development of Bacillus subtilis 168.
J Bacteriol: 2011, 193(4);998-1002
[PubMed:21097620]
[WorldCat.org]
[DOI]
(I p)
Wiep Klaas Smits, Alan D Grossman
The transcriptional regulator Rok binds A+T-rich DNA and is involved in repression of a mobile genetic element in Bacillus subtilis.
PLoS Genet: 2010, 6(11);e1001207
[PubMed:21085634]
[WorldCat.org]
[DOI]
(I e)
Wiep Klaas Smits, Tran Thu Hoa, Leendert W Hamoen, Oscar P Kuipers, David Dubnau
Antirepression as a second mechanism of transcriptional activation by a minor groove binding protein.
Mol Microbiol: 2007, 64(2);368-81
[PubMed:17493123]
[WorldCat.org]
[DOI]
(P p)
Hédia Maamar, David Dubnau
Bistability in the Bacillus subtilis K-state (competence) system requires a positive feedback loop.
Mol Microbiol: 2005, 56(3);615-24
[PubMed:15819619]
[WorldCat.org]
[DOI]
(P p)
Mark Albano, Wiep Klaas Smits, Linh T Y Ho, Barbara Kraigher, Ines Mandic-Mulec, Oscar P Kuipers, David Dubnau
The Rok protein of Bacillus subtilis represses genes for cell surface and extracellular functions.
J Bacteriol: 2005, 187(6);2010-9
[PubMed:15743949]
[WorldCat.org]
[DOI]
(P p)
Virginie Molle, Masaya Fujita, Shane T Jensen, Patrick Eichenberger, José E González-Pastor, Jun S Liu, Richard Losick
The Spo0A regulon of Bacillus subtilis.
Mol Microbiol: 2003, 50(5);1683-701
[PubMed:14651647]
[WorldCat.org]
[DOI]
(P p)
Noel Baichoo, Tao Wang, Rick Ye, John D Helmann
Global analysis of the Bacillus subtilis Fur regulon and the iron starvation stimulon.
Mol Microbiol: 2002, 45(6);1613-29
[PubMed:12354229]
[WorldCat.org]
[DOI]
(P p)
Tran Thu Hoa, Pablo Tortosa, Mark Albano, David Dubnau
Rok (YkuW) regulates genetic competence in Bacillus subtilis by directly repressing comK.
Mol Microbiol: 2002, 43(1);15-26
[PubMed:11849533]
[WorldCat.org]
[DOI]
(P p)
