hprT [2017-8-11 16:0:3]

trigger enzyme, hypoxanthine phosphoribosyltransferase and part of a transcription activator

locus: BSU00680

pI: 4.60

mw: 20.10 kDa

protein length: 180 aa

gene length: 540 bp

function: purine salvage and interconversion, control of ftsH expression

product: hypoxanthine phosphoribosyltransferase

essential: no

ec: 2.4.2.8

synonyms

Genomic Context

categories

• [category|SW 2|Metabolism] → [category|SW 2.5|Nucleotide metabolism] → [category|SW 2.5.2|Biosynthesis/ acquisition of nucleotides] → [category|SW 2.5.2.3|Purine salvage and interconversion]
• [category|SW 3|Information processing] → [category|SW 3.4|Regulation of gene expression] → [category|SW 3.4.2|Transcription factors and their control] → [category|SW 3.4.2.5|Transcription factors/ other]
• [category|SW 3|Information processing] → [category|SW 3.4|Regulation of gene expression] → [category|SW 3.4.2|Transcription factors and their control] → [category|SW 3.4.2.7|Control of transcription factor (other than two-component system)]
• [category|SW 3|Information processing] → [category|SW 3.5|Targets of second messengers] → [category|SW 3.5.3|Targets of (p)ppGpp]
• [category|SW 4|Lifestyles] → [category|SW 4.3|Coping with stress] → [category|SW 4.3.2|Cell envelope stress proteins (controlled by SigM, V, W, X, Y)]

Gene

Coordinates: 76,344 → 76,886

Phenotypes of a mutant

• essential [Pubmed|12682299], non-essential according to [Pubmed|28189581]

The protein

Catalyzed reaction/ biological activity

• IMP diphosphate = hypoxanthine 5-phospho-alpha-D-ribose 1-diphosphate (according to Swiss-Prot)

Protein family

• purine/pyrimidine phosphoribosyltransferase family (according to Swiss-Prot)

Effectors of protein activity

• inhibition of enzymatic activity by (p)ppGpp during the ´stringent response´[Pubmed|22981860]

Structure

• [PDB|1J7J] (from ''Salmonella typhimurium'', 51% identity, 73% similarity)

[SW|Localization]

• cytoplasm (according to Swiss-Prot)

Expression and Regulation

Operons

• genes: [gene|473F93EA5ADB78CD23C9C054B5D6B739078DDEEB|tilS]-[gene|B7BFC170EEC88DEC6CF932F80805D3F2C0BD3738|hprT]-[gene|4E7B9426CED372AA8A321A147116A3A589FBF20C|ftsH]
  description: [Pubmed|18179421]

  sigma factors

  • [protein|081DF3EE9FA56209D648C7677188C61CE3AA8E41|SigM]: sigma factor, [Pubmed|18179421], in [regulon|081DF3EE9FA56209D648C7677188C61CE3AA8E41|SigM regulon]
  • [protein|360F48D576DE950DF79C1A2677B7A35A8D8CC30C|SigA]: sigma factor, [Pubmed|7608085], in [regulon|360F48D576DE950DF79C1A2677B7A35A8D8CC30C|SigA regulon]

  regulatory mechanism

  • [protein|473F93EA5ADB78CD23C9C054B5D6B739078DDEEB|TilS]: activation, with [protein|B7BFC170EEC88DEC6CF932F80805D3F2C0BD3738|HprT] [Pubmed|24001521], in [regulon|473F93EA5ADB78CD23C9C054B5D6B739078DDEEB|TilS regulon]
  • [protein|B7BFC170EEC88DEC6CF932F80805D3F2C0BD3738|HprT]: activation, with [protein|473F93EA5ADB78CD23C9C054B5D6B739078DDEEB|TilS] [Pubmed|24001521], in [regulon|B7BFC170EEC88DEC6CF932F80805D3F2C0BD3738|HprT regulon]

  regulation

  • induced by heat shock (class III)

  additional information

  • the mRNA is very stable (half-life > 15 min) [http://www.ncbi.nlm.nih.gov/sites/entrez/12884008 PubMed]

• genes: [gene|7C8DFE00A2B2B30CC8BEB35055D92CC2E4128F3A|spoIIE]-[gene|C8AA53889FC8B389E1D921B762BD78990C7A8E57|yabS]-[gene|E86A96B832351FF513DD9853EAD8998CC44C9951|yabT]-[gene|473F93EA5ADB78CD23C9C054B5D6B739078DDEEB|tilS]-[gene|B7BFC170EEC88DEC6CF932F80805D3F2C0BD3738|hprT]-[gene|4E7B9426CED372AA8A321A147116A3A589FBF20C|ftsH]
  description: [pubmed|22383849]

  sigma factors

  • [protein|CFF318EE6CACDEE763FBF96A2ABB46E944679AAA|SigF]: sigma factor, [Pubmed|16497325], in [regulon|CFF318EE6CACDEE763FBF96A2ABB46E944679AAA|SigF regulon]

  regulation

  • expressed early during sporulation in the forespore ([protein|CFF318EE6CACDEE763FBF96A2ABB46E944679AAA|SigF]) [Pubmed|16497325]

References

Reviews

• 28031352

Original publications

• 18179421,22981860,24001521,6408059,28189581