PtsI

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  • Description: Enzyme I, general (non sugar-specific) component of the PTS. Enzyme I transfers the phosphoryl group from phosphoenolpyruvate (PEP) to the phosphoryl carrier protein (HPr)

Gene name ptsI
Synonyms
Essential no
Product phosphotransferase system (PTS) enzyme I
Function PTS-dependent sugar transport
Gene expression levels in SubtiExpress: ptsI
Interactions involving this protein in SubtInteract: PtsI
Metabolic function and regulation of this protein in SubtiPathways:
Central C-metabolism
MW, pI 62,9 kDa, 4.59
Gene length, protein length 1710 bp, 570 amino acids
Immediate neighbours ptsH, splA
Get the DNA and protein sequences
(Barbe et al., 2009)
Genetic context
PtsI context.gif
This image was kindly provided by SubtiList
Expression at a glance   PubMed
PtsI expression.png




























Categories containing this gene/protein

phosphotransferase systems, phosphoproteins

This gene is a member of the following regulons

GlcT regulon, stringent response

The gene

Basic information

  • Locus tag: BSU13910

Phenotypes of a mutant

Database entries

  • DBTBS entry: [1]
  • SubtiList entry: [2]

Additional information

The protein

Basic information/ Evolution

  • Catalyzed reaction/ biological activity: Phosphoenolpyruvate + protein L-histidine = pyruvate + protein N(pi)-phospho-L-histidine (according to Swiss-Prot) PEP-dependent autophosphorylation on His-189, transfer of the phosphoryl group to HPr (His-15)
  • Protein family: PEP-utilizing enzyme family (according to Swiss-Prot) PEP-utilizing enzyme family
  • Paralogous protein(s):

Extended information on the protein

  • Kinetic information:
  • Domains:
    • HPr binding site (N-Terminal Domain)
    • pyruvate binding site (C-Terminal Domain)
    • pyrophosphate/phosphate carrier histidine (central Domain)
  • Modification:
    • transient autophosphorylation on His-189
    • in vivo also phosphorylated on Ser-34 or Ser-36 PubMed
  • Cofactor(s): Magnesium
  • Effectors of protein activity:

Database entries

  • Structure: 2WQD (Enzyme I from Staphylococcus aureus) PubMed
  • KEGG entry: [3]

Additional information

Expression and regulation

  • Regulation:
    • expression activated by glucose (2 fold) (GlcT) PubMed
    • the ptsH promoter is constitutive PubMed
    • subject to negative stringent control upon amino acid limitation (due to control of ptsG transcription initiation) PubMed
  • Additional information:

Biological materials

  • Mutant: available in Stülke lab
    • GP864 (ermC)
    • GP778 (replacement of glcT and the ptsG-ptsH-ptsI operon by a spc cassette)
  • Expression vector:
    • pAG3 (His-tag), available in Galinier lab
    • for expression, purification in E. coli (His-tag), in pWH844: pGP813 available in Stülke lab
  • lacZ fusion:
  • GFP fusion:
  • Antibody:

Labs working on this gene/protein

Josef Deutscher, Paris-Grignon, France

Jörg Stülke, University of Göttingen, Germany Homepage

Your additional remarks

References