CheW

• Description: modulation of CheA activity in response to attractants, scaffold protein: facilitates coupling between CheA and receptors
  
  

Gene name	cheW
Synonyms
Essential	no
Product	CheA modulator
Function	control of CheA activity
Gene expression levels in SubtiExpress: cheW
MW, pI	17 kDa, 4.422
Gene length, protein length	468 bp, 156 aa
Immediate neighbours	cheA, cheC
Sequences	Protein DNA DNA_with_flanks
Genetic context This image was kindly provided by SubtiList
Expression at a glance   PubMed

Categories containing this gene/protein

motility and chemotaxis

This gene is a member of the following regulons

CodY regulon, DegU regulon, SigD regulon, Spo0A regulon

The gene

Basic information

• Locus tag: BSU16440

Phenotypes of a mutant

• cheV cheW double mutants exhibit complete loss of chemotaxis PubMed

Database entries

• BsubCyc: BSU16440

• DBTBS entry: [1]

• SubtiList entry: [2]

The protein

Basic information/ Evolution

• Catalyzed reaction/ biological activity:

• Protein family:

• Paralogous protein(s): CheV (N-terminal domain)

Extended information on the protein

• Kinetic information:

• Domains:

• Modification:

• Cofactor(s):

• Effectors of protein activity:

• Interactions:
  • CheA-CheW PubMed
  • McpB-CheW PubMed

• Localization:
  • cytoplasm (according to Swiss-Prot)
  • predominantly present at the cell poles PubMed

Database entries

• BsubCyc: BSU16440

• Structure:

• UniProt: P39802

• KEGG entry: [3]

• E.C. number:

Additional information

• subject to Clp-dependent proteolysis upon glucose starvation PubMed

Expression and regulation

• Operon: part of the fla-che operon
  • flgB-flgC-fliE-fliF-fliG-fliH-fliI-fliJ-ylxF-fliK-flgD-flgE-fliL-fliM-fliY-cheY-fliZ-fliP-fliQ-fliR-flhB-flhA-flhF-flhG-cheB-cheA-cheW-cheC-cheD-sigD-swrB PubMed
  • ylxF-fliK-flgD-flgE-fliL-fliM-fliY-cheY-fliZ-fliP-fliQ-fliR-flhB-flhA-flhF-flhG-cheB-cheA-cheW-cheC-cheD-sigD-swrB PubMed

• Expression browser: cheW PubMed

• Sigma factor:
  • flgB: SigA PubMed, SigD PubMed
  • ylxF: SigD PubMed

• Regulation: see fla-che operon

• Regulatory mechanism: see fla-che operon

• Additional information:
  • subject to Clp-dependent proteolysis upon glucose starvation PubMed
  • in minimal medium, CheW is present with 2,100 +/- 430 molecules per cell PubMed
  • number of protein molecules per cell (minimal medium with glucose and ammonium): 840 PubMed
  • number of protein molecules per cell (complex medium with amino acids, without glucose): 1423 PubMed
  • number of protein molecules per cell (minimal medium with glucose and ammonium, exponential phase): 1996 PubMed
  • number of protein molecules per cell (minimal medium with glucose and ammonium, early stationary phase after glucose exhaustion): 1296 PubMed
  • number of protein molecules per cell (minimal medium with glucose and ammonium, late stationary phase after glucose exhaustion): 699 PubMed

Biological materials

• Mutant:

• Expression vector:

• lacZ fusion:

• GFP fusion:

• two-hybrid system:

• Antibody:

References

Reviews

Gerald L Hazelbauer, Wing-Cheung Lai
Bacterial chemoreceptors: providing enhanced features to two-component signaling.
Curr Opin Microbiol: 2010, 13(2);124-32
[PubMed:20122866] [WorldCat.org] [DOI] (I p)