pxpB

subunit of ATP-dependent 5-oxoprolinase, inhibitor of [protein|B29CAD04FB89ACC482EFCD29D50EDDA19145CAA2|KinA], control of the [SW|phosphorelay]

locus: BSU_04080

pI: 4.66

mw: 26.57 kDa

protein length: 240 aa

gene length: 723 bp

function: detoxification of 5-oxoproline, control of the [SW|phosphorelay], initiation of [SW|sporulation]

product: subunit of 5-oxoprolinase, inhibitor of [protein|B29CAD04FB89ACC482EFCD29D50EDDA19145CAA2|KinA]

essential: no

synonyms: kipI,ycsJ

Genomic Context

categories

• [category|SW 2|Metabolism] → [category|SW 2.7|Detoxification reactions]
• [category|SW 3|Information processing] → [category|SW 3.4|Regulation of gene expression] → [category|SW 3.4.7|phosphorelay] → [category|SW 3.4.7.2|Proteins controlling the activity of the kinases]
• [category|SW 4|Lifestyles] → [category|SW 4.2|Sporulation] → [category|SW 4.2.2|phosphorelay] → [category|SW 4.2.2.2|Proteins controlling the activity of the kinases]

Gene

Coordinates: 459,867 460,589

Phenotypes of a mutant

• no growth with 5-oxoproline as single source of nitrogen [pubmed|28830929]
• reduced growth with ammonium as source of nitrogen due to the accumulation of toxic 5-oxoproline [pubmed|28830929]

The protein

Catalyzed reaction/ biological activity

• 5-oxoproline + ATP --> glutamate + ADP + P_i [pubmed|28830929]

Protein family

• PxpB family (single member, according to UniProt)

Kinetic information

• K_m (5-oxoproline): 39 M [pubmed|28830929]

Effectors of protein activity

• binding of [protein|3BA8F1F71B1D65EB30867ABD27867F925DAD2D7B|PxpC] prevents [protein|5A5E17D39296FECC1C03B1A7791AB1065BB4E4DF|PxpB] from binding to [protein|B29CAD04FB89ACC482EFCD29D50EDDA19145CAA2|KinA] [Pubmed|9334321]

Structure

• [PDB|2ZP2] [Pubmed|18823995]

Expression and Regulation

Operons

• genes: [gene|77F758CE9A59AC41F283CB1F5099097386133799|pxpA]-[gene|9AD419E3CB86C54A0F11E96C82E80A357C6B23D2|ycsG]-[gene|312E2A4ADFBCB9DD9AD9EEEC9FE53F3932AF5DBA|ycsI]-[gene|5A5E17D39296FECC1C03B1A7791AB1065BB4E4DF|pxpB]-[gene|3BA8F1F71B1D65EB30867ABD27867F925DAD2D7B|pxpC]-[gene|7DA9A79876C546B78B716A64706A3A3716018C2E|kipR]-[gene|05910B4500420D4DB75DAD3A7A2358C360FF2154|lipC]
  description: [Pubmed|9334321]

  regulatory mechanism

  • [protein|7DA9A79876C546B78B716A64706A3A3716018C2E|KipR]: repression, [Pubmed|9334321], in [regulon|7DA9A79876C546B78B716A64706A3A3716018C2E|KipR regulon]
  • [protein|857EF1AC54DEA0690C01B7F8CEFFD16312C58F20|TnrA]: activation, [Pubmed|9334321], in [regulon|857EF1AC54DEA0690C01B7F8CEFFD16312C58F20|TnrA regulon]

  regulation

  • induced in the presence of 5-oxoproline [pubmed|28830929]

Biological materials

Mutant

• BKE04080 ([gene|5A5E17D39296FECC1C03B1A7791AB1065BB4E4DF|pxpB]::erm trpC2) available at [http://www.bgsc.org/getdetail.php?bgscid=BKE04080 BGSC], [Pubmed|28189581], upstream reverse: _UP1_CATCTTTCTCACCTCTTTTA, downstream forward: _UP4_TATAAGGAGGAGTCCAATTG
• BKK04080 ([gene|5A5E17D39296FECC1C03B1A7791AB1065BB4E4DF|pxpB]::kan trpC2) available at [http://www.bgsc.org/getdetail.php?bgscid=BKK04080 BGSC], [Pubmed|28189581], upstream reverse: _UP1_CATCTTTCTCACCTCTTTTA, downstream forward: _UP4_TATAAGGAGGAGTCCAATTG

References

• 9334321,20524093,18823995,21050859,25755103,28830929