3JA6

Cryo-electron Tomography and All-atom Molecular Dynamics Simulations Reveal a Novel Kinase Conformational Switch in Bacterial Chemotaxis Signaling


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 12.7 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: TOMOGRAPHY 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

CryoEM and computer simulations reveal a novel kinase conformational switch in bacterial chemotaxis signaling.

Cassidy, C.K.Himes, B.A.Alvarez, F.J.Ma, J.Zhao, G.Perilla, J.R.Schulten, K.Zhang, P.

(2015) Elife 4: e08419-e08419

  • DOI: 10.7554/eLife.08419

  • PubMed Abstract: 
  • Chemotactic responses in bacteria require large, highly ordered arrays of sensory proteins to mediate the signal transduction that ultimately controls cell motility. A mechanistic understanding of the molecular events underlying signaling, however, h ...

    Chemotactic responses in bacteria require large, highly ordered arrays of sensory proteins to mediate the signal transduction that ultimately controls cell motility. A mechanistic understanding of the molecular events underlying signaling, however, has been hampered by the lack of a high-resolution structural description of the extended array. Here, we report a novel reconstitution of the array, involving the receptor signaling domain, histidine kinase CheA, and adaptor protein CheW, as well as a density map of the core-signaling unit at 11.3 Å resolution, obtained by cryo-electron tomography and sub-tomogram averaging. Extracting key structural constraints from our density map, we computationally construct and refine an atomic model of the core array structure, exposing novel interfaces between the component proteins. Using all-atom molecular dynamics simulations, we further reveal a distinctive conformational change in CheA. Mutagenesis and chemical cross-linking experiments confirm the importance of the conformational dynamics of CheA for chemotactic function.


    Organizational Affiliation

    Department of Physics and Beckman Institute, University of Illinois at Urbana-Champaign, Urbana, United States.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Chemotaxis protein CheW
A, B, D, F
139Thermotoga maritima (strain ATCC 43589 / MSB8 / DSM 3109 / JCM 10099)Mutation(s): 0 
Gene Names: cheW
Find proteins for Q56311 (Thermotoga maritima (strain ATCC 43589 / MSB8 / DSM 3109 / JCM 10099))
Go to UniProtKB:  Q56311
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Chemotaxis protein CheA
C, E
379Thermotoga maritima (strain ATCC 43589 / MSB8 / DSM 3109 / JCM 10099)Mutation(s): 0 
Gene Names: cheA
EC: 2.7.13.3
Find proteins for Q56310 (Thermotoga maritima (strain ATCC 43589 / MSB8 / DSM 3109 / JCM 10099))
Go to UniProtKB:  Q56310
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Methyl-accepting chemotaxis protein 2
G, I, K, M, O, Q
309Thermotoga maritima (strain ATCC 43589 / MSB8 / DSM 3109 / JCM 10099)Mutation(s): 0 
Gene Names: mcp2
Find proteins for Q9X0M7 (Thermotoga maritima (strain ATCC 43589 / MSB8 / DSM 3109 / JCM 10099))
Go to UniProtKB:  Q9X0M7
Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
Methyl-accepting chemotaxis protein 2
H, J, L, N, P, R
307Thermotoga maritima (strain ATCC 43589 / MSB8 / DSM 3109 / JCM 10099)Mutation(s): 0 
Gene Names: mcp2
Find proteins for Q9X0M7 (Thermotoga maritima (strain ATCC 43589 / MSB8 / DSM 3109 / JCM 10099))
Go to UniProtKB:  Q9X0M7
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 12.7 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: TOMOGRAPHY 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-12-09
    Type: Initial release