CitZ

• Description: citrate synthase
  
  

Gene name	citZ
Synonyms	citA2
Essential	no
Product	citrate synthase II
Function	TCA cycle
MW, pI	41 kDa, 5.451
Gene length, protein length	1116 bp, 372 aa
Immediate neighbours	ytwI, icd
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: BSU29140

Phenotypes of a mutant

glutamate auxotrophy and a defect in sporulation PubMed

Database entries

• DBTBS entry: [1]

• SubtiList entry: [2]

The protein

Basic information/ Evolution

• Catalyzed reaction/ biological activity: Acetyl-CoA + H₂O + oxaloacetate = citrate + CoA (according to Swiss-Prot) acetyl-CoA + oxaloacetate ---> citrate, the reaction is irreversible

• Protein family: citrate synthase family (according to Swiss-Prot)

• Paralogous protein(s): MmgD, CitA

Extended information on the protein

• Kinetic information:

• Domains:

• Modification: phosphorylation on Ser-284 PubMed

• Cofactor(s):

• Effectors of protein activity: inhibited by ATP PubMed

• Interactions:

• Localization:

Database entries

• Structure: 2C6X

• Swiss prot entry: P39120

• KEGG entry: [3]

• E.C. number: 2.3.3.1

Expression and regulation

• Operon: citZ-icd-mdh

• Sigma factor: SigA

• Regulation: repressed by glucose (6.7-fold) (CcpA) PubMed, catabolite repression (CcpA), repression by glucose + glutamate (CcpC) PubMed, repression under anaerobic conditions PubMed

• Regulatory mechanism: CcpA: transcription repression, CcpA: transcription repression, CcpC: transcription repression PubMed

• Additional information:

Biological materials

• Mutant: GP678 (erm), available in Stülke lab

• Expression vector:
  • pGP1120 (N-terminal Strep-tag, for SPINE, purification from B. subtilis, in pGP380)

• lacZ fusion:

• GFP fusion:

• two-hybrid system:

• Antibody: available in Linc Sonenshein lab

Labs working on this gene/protein

Linc Sonenshein, Tufts University, Boston, MA, USA Homepage

Jörg Stülke, University of Göttingen, Germany Homepage

References

1. Blencke et al. (2003) Transcriptional profiling of gene expression in response to glucose in Bacillus subtilis: regulation of the central metabolic pathways. Metab Eng. 5: 133-149 PubMed
2. Macek et al. (2007) The serine/ threonine/ tyrosine phosphoproteome of the model bacterium Bacillus subtilis. Mol. Cell. Proteomics 6: 697-707 PubMed
3. Kim HJ, Roux A, Sonenshein AL (2002b) Direct and indirect roles of CcpA in regulation of Bacillus subtilis Krebs cycle genes. Mol Microbiol 45:179-190. PubMed
4. Nakano MM, Zuber P, Sonenshein AL (1998) Anaerobic regulation of Bacillus subtilis Krebs cycle genes. J Bacteriol. 180: 3304-3311. PubMed
5. Jin S, Sonenshein AL (1994) Identification of two distinct Bacillus subtilis citrate synthase genes J Bacteriol. 176: 4669-4679. PubMed
6. Author1, Author2 & Author3 (year) Title Journal volume: page-page. PubMed