6S1K

E. coli Core Signaling Unit, carrying QQQQ receptor mutation

Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 8.38 Å
  • Aggregation State: 2D ARRAY 
  • Reconstruction Method: SUBTOMOGRAM AVERAGING 

wwPDB Validation   3D Report Full Report


This is version 1.0 of the entry. See complete history. 


Literature

Structure and dynamics of the E. coli chemotaxis core signaling complex by cryo-electron tomography and molecular simulations.

Cassidy, C.K., Himes, B.A., Sun, D., Ma, J., Zhao, G., Parkinson, J.S., Stansfeld, P.J., Luthey-Schulten, Z., Zhang, P.

(2020) Commun Biol 3: 24-24

  • DOI: https://doi.org/10.1038/s42003-019-0748-0
  • Primary Citation of Related Structures:  
    6S1K

  • PubMed Abstract: 

    • To enable the processing of chemical gradients, chemotactic bacteria possess large arrays of transmembrane chemoreceptors, the histidine kinase CheA, and the adaptor protein CheW, organized as coupled core-signaling units (CSU). Despite decades of study, important questions surrounding the molecular mechanisms of sensory signal transduction remain unresolved, owing especially to the lack of a high-resolution CSU structure ...

    To enable the processing of chemical gradients, chemotactic bacteria possess large arrays of transmembrane chemoreceptors, the histidine kinase CheA, and the adaptor protein CheW, organized as coupled core-signaling units (CSU). Despite decades of study, important questions surrounding the molecular mechanisms of sensory signal transduction remain unresolved, owing especially to the lack of a high-resolution CSU structure. Here, we use cryo-electron tomography and sub-tomogram averaging to determine a structure of the Escherichia coli CSU at sub-nanometer resolution. Based on our experimental data, we use molecular simulations to construct an atomistic model of the CSU, enabling a detailed characterization of CheA conformational dynamics in its native structural context. We identify multiple, distinct conformations of the critical P4 domain as well as asymmetries in the localization of the P3 bundle, offering several novel insights into the CheA signaling mechanism.

    Organizational Affiliation: 

    Electron Bio-Imaging Centre, Diamond Light Sources, Harwell Science and Innovation Campus, Didcot, OX11 0DE, UK. peijun@strubi.ox.ac.uk.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Chemotaxis protein CheA
A, B
654Escherichia coli str. K-12 substr. MG1655starMutation(s): 0 
Gene Names: cheA, b1888, JW1877
EC: 2.7.13.3
UniProt
Find proteins for P07363 (Escherichia coli (strain K12))
Explore P07363 
Go to UniProtKB:  P07363
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UniProt GroupP07363
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
CheW
C, D
167Escherichia coli str. K-12 substr. MG1655starMutation(s): 0 
UniProt
Find proteins for P0A964 (Escherichia coli (strain K12))
Explore P0A964 
Go to UniProtKB:  P0A964
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UniProt GroupP0A964
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Methyl-accepting chemotaxis protein I
E, F, G, H, I
E, F, G, H, I, J, K, L, M, N, O, P
551Escherichia coli str. K-12 substr. MG1655starMutation(s): 0 
Gene Names: tsr, cheD, b4355, JW4318
Membrane Entity: Yes 
UniProt
Find proteins for P02942 (Escherichia coli (strain K12))
Explore P02942 
Go to UniProtKB:  P02942
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UniProt GroupP02942
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 8.38 Å
  • Aggregation State: 2D ARRAY 
  • Reconstruction Method: SUBTOMOGRAM AVERAGING 
EM Software:
TaskSoftware PackageVersion
MODEL REFINEMENTMDFF

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Biotechnology and Biological Sciences Research CouncilUnited KingdomBB/S003339/1
National Science Foundation (United States)United StatesPHY1430124

Revision History  (Full details and data files)

  • Version 1.0: 2020-01-22
    Type: Initial release