PurC

• Description: phosphoribosylaminoimidazole succinocarboxamide synthase
  
  

Gene name	purC
Synonyms
Essential	no
Product	phosphoribosylaminoimidazole succinocarboxamide synthase
Function	purine biosynthesis
Gene expression levels in SubtiExpress: purC
Metabolic function and regulation of this protein in SubtiPathways: purC
MW, pI	27 kDa, 4.875
Gene length, protein length	723 bp, 241 aa
Immediate neighbours	purB, purS
Sequences	Protein DNA DNA_with_flanks
Genetic context This image was kindly provided by SubtiList
Expression at a glance   PubMed

Categories containing this gene/protein

biosynthesis/ acquisition of nucleotides, most abundant proteins

This gene is a member of the following regulons

G-box, PurR regulon

The gene

Basic information

• Locus tag: BSU06450

Database entries

• BsubCyc: BSU06450

• DBTBS entry: [1]

• SubtiList entry: [2]

The protein

Basic information/ Evolution

• Catalyzed reaction/ biological activity: ATP + 5-amino-1-(5-phospho-D-ribosyl)imidazole-4-carboxylate + L-aspartate = ADP + phosphate + (S)-2-(5-amino-1-(5-phospho-D-ribosyl)imidazole-4-carboxamido)succinate (according to Swiss-Prot)

• Protein family: SAICAR synthetase family (according to Swiss-Prot)

• Paralogous protein(s):

Extended information on the protein

• Kinetic information:

• Domains:

• Modification:

• Cofactors:

• Effectors of protein activity:

• Interactions:

• Localization:

Database entries

• BsubCyc: BSU06450

• Structure: 1KUT (from Thermotoga maritima, 40% identity, 57% similarity) PubMed

• UniProt: P12046

• KEGG entry: [3]

• E.C. number: 6.3.2.6

Expression and regulation

• Operon: purE-purK-purB-purC-purS-purQ-purL-purF-purM-purN-purH-purD PubMed

• Expression browser: purC PubMed

• Sigma factor: SigA PubMed

• Regulation:
  • repressed in the presence of purine nucleotides (PurR) PubMed
  • repressed in the presence of adenine or adenosine(PurR) PubMed
  • repressed in the presence of guanine(G-box) PubMed

• Regulatory mechanism:
  • [PurR]]: transcription repression PubMed
  • PurR: transcription repression (molecular inducer: PRPP) PubMed
  • G-box: transcription termination/ antitermination (riboswitch) PubMed1 PubMed2

• Additional information:
  • the mRNA is very stable (half-life > 15 min) PubMed
  • belongs to the 100 most abundant proteins PubMed
  • number of protein molecules per cell (minimal medium with glucose and ammonium): 1218 PubMed
  • number of protein molecules per cell (complex medium with amino acids, without glucose): 4129 PubMed

Biological materials

• Mutant:

• Expression vector:

• lacZ fusion:

• GFP fusion:

• two-hybrid system:

• Antibody: