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ktrB
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ktrB

high affinity potassium channel KtrA-KtrB, integral membrane subunit
Locus
BSU_31100
Isoelectric point
10.12
Molecular weight
48.27 kDa
Protein length
445 aa Sequence Blast
Gene length
1338 bp Sequence Blast
Function
potassium uptake
Product
high affinity potassium channel KtrA-KtrB, integral membrane subunit
Essential
no
Synonyms
yubG

Genomic Context

      
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Categories containing this gene/protein

Gene

Coordinates
3,189,089 3,190,426

Phenotypes of a mutant

  • a kimA ktrA ktrB mutant requires high potassium concentrations on minimal medium with ammonium as nitrogen source PubMed
  • The protein

    Catalyzed reaction/ biological activity

  • uptake of potassium
  • Protein family

  • TrkH potassium transport family (with KtrD, according to UniProt)
  • Paralogous protein(s)

    Kinetic information

  • the KtrA-KtrB channel has a high affinity for potassium,this is determined by KtrB PubMed
  • Structure

  • 4J7C (the KtrA-KtrB complex) PubMed
  • Localization

  • integral membrane protein PubMed
  • Expression and Regulation

    Operons

    Genes
    Description

    Regulatory mechanism

  • ydaO riboswitch: termination/antitermination, expression is switched off upon binding of c-di-AMP, in ydaO riboswitch
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    Additional information

  • growth at extreme potassium limitation results in the acquisition of promoter mutations with increased ktrA-ktrB expression PubMed
  • Biological materials

    Mutant

  • MGNA-A227 (yubG::erm), available at the NBRP B. subtilis, Japan
  • 1A954 ( ktrB::kan), PubMed, available at BGSC
  • GHB1 (ktrA-ktrB::aphA3), available in Erhard Bremer's lab
  • GP92 (ktrA-ktrB::aphA3), available in Jörg Stülke's lab PubMed
  • GP2083 (ktrA-ktrB::aphA3 ktrC::tet), available in Jörg Stülke's lab PubMed
  • GP2498 (ktrA-ktrB::spc kimA::cat), available in Jörg Stülke's lab
  • BKE31100 (ktrB::erm trpC2) available at BGSC, PubMed, upstream reverse: _UP1_CACCTTTGTCTACATCCCTT, downstream forward: _UP4_TGATATCAAAAAAATCCGGC
  • BKK31100 (ktrB::kan trpC2) available at BGSC, PubMed, upstream reverse: _UP1_CACCTTTGTCTACATCCCTT, downstream forward: _UP4_TGATATCAAAAAAATCCGGC
  • GP2716 (ktrA-ktrB::spc), available in Jörg Stülke's lab
  • GP3064 (ktrB::kan), available in Jörg Stülke's lab
  • Expression vector

  • pGP2992: (IPTG inducible expression, purification in E. coli with N-terminal His-tag, in pWH844), available in Jörg Stülke's lab
  • FLAG-tag construct

  • GP2277 (based on pGP1331), available in Jörg Stülke's lab PubMed
  • Labs working on this gene/protein

  • Erhard Bremer, University of Marburg, Germany Homepage
  • Inga Hänelt, Frankfurt, Germany Homepage
  • João H Morais-Cabral, University of Porto, Portugal Homepage
  • Jörg Stülke, University of Göttingen, Germany Homepage
  • References

    Reviews

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    Original publications

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