qoxB

cytochrome aa3 quinol oxidase (subunit I)

locus: BSU_38160

pI: 8.85

mw: 73.66 kDa

protein length: 649 aa

gene length: 1950 bp

function: respiration

product: cytochrome aa3 quinol oxidase (subunit I)

essential: no

ec: 1.10.3.-

synonyms: ipa-38d

Genomic Context

categories

• [category|SW 2|Metabolism] → [category|SW 2.1|Electron transport and ATP synthesis] → [category|SW 2.1.2|Respiration] → [category|SW 2.1.2.1|Terminal oxidases]
• [category|SW 6|Groups of genes] → [category|SW 6.2|Membrane proteins]

Gene

Coordinates: 3,915,319 → 3,917,268

Phenotypes of a mutant

• inactivation of ''[gene|CBF2DCFFD8195304F942ECBA8596444F0AC47CC6|qoxB]'' restores beta-lactam resistance in a ''[gene|081DF3EE9FA56209D648C7677188C61CE3AA8E41|sigM]'' mutant [Pubmed|22211522]
• inactivation of ''qoxB'' facilitates without a wall (due to reduction of oxidative stress) [Pubmed|26051891]

The protein

Catalyzed reaction/ biological activity

• 2 quinol + O₂ --> 2 quinone + 2 H₂O (according to UniProt)

Protein family

• heme-copper respiratory oxidase family (with [protein|20D1174554A03EECE233A1A045F6DF83AF799959|CtaD], according to UniProt)

Paralogous protein(s)

• [protein|20D1174554A03EECE233A1A045F6DF83AF799959|CtaD]

[SW|Cofactors]

• Cu(B) [Pubmed|10837475]

Structure

• [PDB|1FFT] ([protein|48A9E1E39838BFFCF12CADF0A8D8E6FFDCA6F175|QoxA]-[protein|CBF2DCFFD8195304F942ECBA8596444F0AC47CC6|QoxB]-[protein|CD4520EF427AEFDCF028AE063BC373FA6DCE379E|QoxC] complex from ''E. coli'', 52% identity) [Pubmed|11017202]

[SW|Localization]

• cell membrane [Pubmed|18763711]

Expression and Regulation

Operons

• genes: [gene|48A9E1E39838BFFCF12CADF0A8D8E6FFDCA6F175|qoxA]-[gene|CBF2DCFFD8195304F942ECBA8596444F0AC47CC6|qoxB]-[gene|CD4520EF427AEFDCF028AE063BC373FA6DCE379E|qoxC]-[gene|03335DC50CED7B38E2380640AE108ADA09A2CBDF|qoxD]
  description: [Pubmed|1316894]

  regulatory mechanism

  • [regulon|stringent response|stringent response]: negative regulation, in [regulon|stringent response|stringent response]
  • [protein|E15E9F88B0E03FE8834C646369D2F4B4E713EF41|CitB]: mRNA binding, in [regulon|E15E9F88B0E03FE8834C646369D2F4B4E713EF41|CitB regulon]

  regulation

  • [protein|search|RelA] dependent downregulation (Class I) during stringent response [Pubmed|11948165]

  additional information

  • the presence of an iron-responsive element bound by [SW|CitB] between ''[SW|feuA]'' and ''[SW|feuB]'' suggests iron-dependent regulation by [SW|CitB] [Pubmed|10468622]

Biological materials

Mutant

• BKE38160 (Δ[gene|CBF2DCFFD8195304F942ECBA8596444F0AC47CC6|qoxB]::erm trpC2) available at [http://www.bgsc.org/getdetail.php?bgscid=BKE38160 BGSC], [Pubmed|28189581], upstream reverse: _UP1_CATGCAGGCTTCCTCCTTTC, downstream forward: _UP4_ATTTCCGAATAAGGAGGCGT
• BKK38160 (Δ[gene|CBF2DCFFD8195304F942ECBA8596444F0AC47CC6|qoxB]::kan trpC2) available at [http://www.bgsc.org/getdetail.php?bgscid=BKK38160 BGSC], [Pubmed|28189581], upstream reverse: _UP1_CATGCAGGCTTCCTCCTTTC, downstream forward: _UP4_ATTTCCGAATAAGGAGGCGT

References

• 11073895,1316894,20351111,10551842,18763711,21821766,10837475,24779955,22211522,26196462,26051891,11017202,27503613