PurB

• Description: adenylsuccinate lyase
  
  

Gene name	purB
Synonyms
Essential	no
Product	adenylsuccinate lyase
Function	purine biosynthesis
Gene expression levels in SubtiExpress: purB
Metabolic function and regulation of this protein in SubtiPathways: purB
MW, pI	49 kDa, 5.822
Gene length, protein length	1293 bp, 431 aa
Immediate neighbours	purK, purC
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: BSU06440

Database entries

• BsubCyc: BSU06440

• DBTBS entry: [1]

• SubtiList entry: [2]

The protein

Basic information/ Evolution

• Catalyzed reaction/ biological activity: N(6)-(1,2-dicarboxyethyl)AMP = fumarate + AMP (according to Swiss-Prot)

• Protein family: Adenylosuccinate lyase subfamily (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: BSU06440

• Structure: 1F1O

• UniProt: P12047

• KEGG entry: [3]

• E.C. number: 4.3.2.2

Additional information

• subject to Clp-dependent proteolysis upon glucose starvation PubMed

Expression and regulation

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

• Expression browser: purB 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:
  • subject to Clp-dependent proteolysis upon glucose starvation PubMed
  • belongs to the 100 most abundant proteins PubMed
  • number of protein molecules per cell (minimal medium with glucose and ammonium): 3585 PubMed
  • number of protein molecules per cell (complex medium with amino acids, without glucose): 9689 PubMed

Biological materials

• Mutant:

• Expression vector:

• lacZ fusion:

• GFP fusion:

• two-hybrid system:

• Antibody: