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- * Bacterial regulatory proteins, crp family signature *
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-
- The many bacterial transcription regulation proteins which bind DNA through a
- 'helix-turn-helix' motif can be classified into subfamilies on the basis of
- sequence similarities. One of these subfamilies groups together [1,2,3]:
-
- - aadR, a transcriptional activator of anaerobic gene expression from
- Rhodopseudomonas palustris.
- - anr, a transcriptional activator of anaerobic gene expression from
- Pseudomonas aeruginosa.
- - crp (also known as cAMP receptor) a protein that complexes with cAMP and
- regulates the transcription of several catabolite-sensitive operons.
- - clp, a protein from Xanthomonas campestris which is involved in the
- regulation of phytopathogenicity. Clp controls the production of
- extracellular enzymes, xanthan gum, and pigment either positively or
- negatively.
- - cysR, a regulator of the expression of genes from the sulfate permease
- complex in Synechococcus PCC 7942
- - fixK, a protein from Rhizobiacae that regulates nitrogen fixation genes
- both positively and negatively.
- - flp, a putative regulatory protein which is linked to the trpDCFBA operon
- of Lactobacillus casei.
- - fnr, a protein that activates genes for proteins involved in a variety of
- anaerobic electron transport systems in Escherichia coli.
- - fnrN, a probable transcriptional regulator that regulates nitrogen fixation
- from Rhizobium leguminosarum biovar viciae.
- - hlyX, a protein from Actinobacillus pleuropneumoniae, which confers a
- hemolytic phenotype on Escherichia coli. HlyX may regulate, rather than
- mediate, hemolytic activity.
- - ntcA, a regulator of the expression of genes subject to nitrogen control
- in cyanobacteria such as Anabaena or Synechococcus.
-
- The 'helix-turn-helix' DNA-binding motif of these proteins is located in the
- C-terminal part of the sequences. The pattern we use to detect these proteins
- starts two residues before the HTH motif and ends two residues after it.
-
- -Consensus pattern: [LIVM]-[STAG]-[RHW]-x(2)-[LI]-[GA]-x-[LIVMFYA]-[LIVS]-G-x-
- [STAC]-x(2)-[MT]-x-[GST]-R-x-[LIVMF]-x(2)-[LIVMF]
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
- -Last update: June 1994 / Text revised.
-
- [ 1] Spiro S., Guest J.R.
- FEMS Microbiol. Rev. 6:399-428(1990).
- [ 2] Irvine A.S., Guest J.R.
- Nucleic Acids Res. 21:753-753(1993).
- [ 3] De Crecy-Lagard V., Glaser P., Lejeune P., Sismeiro O., Barber C.E.,
- Daniels M.J., Danchin A.
- J. Bacteriol. 172:5877-5883(1990).
-