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 

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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
  • Primary Citation of Related Structures:  
    3JA6

  • 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, has been hampered by the lack of a high-resolution structural description of the extended array ...

    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 Structural Biology, University of Pittsburgh School of Medicine, Pittsburgh, United States.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Chemotaxis protein CheWA, B, D, F139Escherichia coliMutation(s): 0 
UniProt
Find proteins for Q56311 (Thermotoga maritima (strain ATCC 43589 / DSM 3109 / JCM 10099 / NBRC 100826 / MSB8))
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Go to UniProtKB:  Q56311
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UniProt GroupQ56311
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Chemotaxis protein CheAC, E379Escherichia coliMutation(s): 0 
EC: 2.7.13.3
UniProt
Find proteins for Q56310 (Thermotoga maritima (strain ATCC 43589 / DSM 3109 / JCM 10099 / NBRC 100826 / MSB8))
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Go to UniProtKB:  Q56310
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UniProt GroupQ56310
Protein Feature View
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Methyl-accepting chemotaxis protein 2
G, I, K, M, O, Q
G, I, K, M, O, Q
309Escherichia coliMutation(s): 0 
UniProt
Find proteins for Q9X0M7 (Thermotoga maritima (strain ATCC 43589 / DSM 3109 / JCM 10099 / NBRC 100826 / MSB8))
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UniProt GroupQ9X0M7
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Methyl-accepting chemotaxis protein 2
H, J, L, N, P, R
H, J, L, N, P, R
307Escherichia coliMutation(s): 0 
UniProt
Find proteins for Q9X0M7 (Thermotoga maritima (strain ATCC 43589 / DSM 3109 / JCM 10099 / NBRC 100826 / MSB8))
Explore Q9X0M7 
Go to UniProtKB:  Q9X0M7
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UniProt GroupQ9X0M7
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Experimental Data & Validation

Experimental Data

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

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

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