CcpA

• Description: Carbon catabolite control protein A, involved in glucose regulation of many genes; represses catabolic genes and activates genes involved in excretion of excess carbon
  
  

Gene name	ccpA
Synonyms	graR, alsA, amyR
Essential	no
Product	transcriptional regulator (LacI family)
Function	mediates carbon catabolite repression (CCR)
Metabolic function and regulation of this protein in SubtiPathways: Nucleoside catabolism, Nucleotides (regulation), Ile, Leu, Val, His, Coenzyme A, Central C-metabolism
MW, pI	36,8 kDa, 5.06
Gene length, protein length	1002 bp, 334 amino acids
Immediate neighbours	motP, aroA
Get the DNA and protein sequences (Barbe et al., 2009)
Genetic context This image was kindly provided by SubtiList

The gene

Basic information

• Locus tag: BSU29740

Phenotypes of a mutant

Loss of carbon catabolite repression. Loss of PTS-dependent sugar transport due to excessive phosphorylation of HPr by HprK. The mutant is unable to grow on a minimal medium with glucose and ammonium as the only sources of carbon and nitrogen, respectively.

Database entries

• DBTBS entry: [1]

• SubtiList entry: [2]

The protein

Basic information/ Evolution

• Catalyzed reaction/ biological activity: transcriptional regulator of carbon catabolite repression (CCR)

• Protein family: LacI family

• Paralogous protein(s):

Genes controlled by CcpA

• Activation by CcpA: pta, ackA, ilvB-ilvH-ilvC-leuA-leuB-leuC-leuD

• Repression by CcpA: abbA, amyE, bglP-bglH, bglS, cccA, citZ-icd-mdh, levD-levE-levF-levG-sacC, licB-licC-licA-licH, phoP-phoR, xylA-xylB, xynP-xynB

Extended information on the protein

• Kinetic information:

• Domains:
  • HTH lacI-type Domain (1 – 58)
  • DNA binding Domain (6 – 25)

• Modification:

• Cofactor(s): HPr-Ser46-P, Crh-Ser-46-P

• Effectors of protein activity:glucose-6-phosphate, fructose-1,6-bisphosphate Pubmed

• Interactions: CcpA-HPr PubMed, CcpA-Crh PubMed

• Localization:

Database entries

• Structure:
  • 2JCG (Apoprotein from Bacillus megaterium)
  • CcpA-Crh-DNA-complex NCBI
  • complex with P-Ser-HPr and sulphate ions NCBI
  • 3OQM (complex of B. subtilis CcpA with P-Ser-HPr and the ackA operator site)
  • 3OQN (complex of B. subtilis CcpA with P-Ser-HPr and the gntR operator site)
  • 3OQO (complex of B. subtilis CcpA with P-Ser-HPr and a optimal synthetic operator site)

• UniProt: P25144

• KEGG entry: [3]

Expression and regulation

• Operon: ccpA-motP-motS PubMed

• Sigma factor:

• Regulation: constitutively expressed PubMed

• Additional information: there are about 3.000 molecules of CcpA per cell PubMed, this corresponds to a concentration of 3 myM (according to PubMed)

Biological materials

• Mutant: QB5407 (spc), GP302 (erm), GP300 (an in frame deletion of ccpA), available in Stülke lab

• Expression vector: pGP643 (N-terminal Strep-tag, purification from B. subtilis, for SPINE, in pGP380), available in Stülke lab

• lacZ fusion:

• GFP fusion:

• Antibody: available in Hillen and Stülke labs

Labs working on this gene/protein

• • Wolfgang Hillen, Erlangen University, Germany Homepage
  • Richard Brennan, Houston, Texas, USA Homepage
  • Milton H. Saier, University of California at San Diego, USA Homepage
  • Yasutaro Fujita, University of Fukuyama, Japan
  • Jörg Stülke, University of Göttingen, Germany Homepage
  • Oscar Kuipers, University of Groningen, The Netherlands Homepage