PDBsum entry 2idm

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protein ligands links
Signaling protein PDB id
Protein chain
128 a.a. *
Waters ×100
* Residue conservation analysis
PDB id:
Name: Signaling protein
Title: 2.00 a structure of t87i/y106w phosphono-chey
Structure: Chemotaxis protein chey. Chain: a. Engineered: yes. Mutation: yes
Source: Escherichia coli. Organism_taxid: 562. Gene: chey. Expressed in: escherichia coli. Expression_system_taxid: 562.
2.00Å     R-factor:   0.233     R-free:   0.328
Authors: C.J.Halkides,R.M.Haas,K.A.Mcadams,E.S.Casper, B.D.Santarsiero,A.D.Mesecar
Key ref: K.McAdams et al. (2008). The structures of T87I phosphono-CheY and T87I/Y106W phosphono-CheY help to explain their binding affinities to the FliM and CheZ peptides. Arch Biochem Biophys, 479, 105-113. PubMed id: 18801331
15-Sep-06     Release date:   25-Sep-07    
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Protein chain
Pfam   ArchSchema ?
P0AE67  (CHEY_ECOLI) -  Chemotaxis protein CheY
129 a.a.
128 a.a.*
Key:    PfamA domain  Secondary structure  CATH domain
* PDB and UniProt seqs differ at 3 residue positions (black crosses)

 Gene Ontology (GO) functional annotation 
  GO annot!
  Cellular component     cytoplasm   1 term 
  Biological process     bacterial-type flagellar cell motility   6 terms 
  Biochemical function     protein binding     4 terms  


Arch Biochem Biophys 479:105-113 (2008)
PubMed id: 18801331  
The structures of T87I phosphono-CheY and T87I/Y106W phosphono-CheY help to explain their binding affinities to the FliM and CheZ peptides.
K.McAdams, E.S.Casper, R.Matthew Haas, B.D.Santarsiero, A.L.Eggler, A.Mesecar, C.J.Halkides.
CheY is a response regulator in bacterial chemotaxis. Escherichia coli CheY mutants T87I and T87I/Y106W CheY are phosphorylatable on Asp57 but unable to generate clockwise rotation of the flagella. To understand this phenotype in terms of structure, stable analogs of the two CheY-P mutants were synthesized: T87I phosphono-CheY and T87I phosphono-CheY. Dissociation constants for peptides derived from flagellar motor protein FliM and phosphatase CheZ were determined for phosphono-CheY and the two mutants. The peptides bind phosphono-CheY almost as strongly as CheY-P; however, they do not bind T87I phosphono-CheY or T87I/Y106W phosphono-CheY, implying that the mutant proteins cannot bind FliM or CheZ tightly in vivo. The structures of T87I phosphono-CheY and T87I/Y106W phosphono-CheY were solved to resolutions of 1.8 and 2.4A, respectively. The increased bulk of I87 forces the side-chain of Y106 or W106, into a more solvent-accessible conformation, which occludes the peptide-binding site.

Literature references that cite this PDB file's key reference

  PubMed id Reference
20213668 R.J.Falconer, A.Penkova, I.Jelesarov, and B.M.Collins (2010).
Survey of the year 2008: applications of isothermal titration calorimetry.
  J Mol Recognit, 23, 395-413.  
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