7YV9

Cryo-EM structure of full-length Myosin Va in the autoinhibited state


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.78 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Starting Models: experimental
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Literature

Autoinhibition and activation mechanisms revealed by the triangular-shaped structure of myosin Va.

Niu, F.Liu, Y.Sun, K.Xu, S.Dong, J.Yu, C.Yan, K.Wei, Z.

(2022) Sci Adv 8: eadd4187-eadd4187

  • DOI: https://doi.org/10.1126/sciadv.add4187
  • Primary Citation of Related Structures:  
    7YV9

  • PubMed Abstract: 

    As the prototype of unconventional myosin motor family, myosin Va (MyoVa) transport cellular cargos along actin filaments in diverse cellular processes. The off-duty MyoVa adopts a closed and autoinhibited state, which can be relieved by cargo binding. The molecular mechanisms governing the autoinhibition and activation of MyoVa remain unclear. Here, we report the cryo-electron microscopy structure of the two full-length, closed MyoVa heavy chains in complex with 12 calmodulin light chains at 4.78-Å resolution. The MyoVa adopts a triangular structure with multiple intra- and interpolypeptide chain interactions in establishing the closed state with cargo binding and adenosine triphosphatase activity inhibited. Structural, biochemical, and cellular analyses uncover an asymmetric autoinhibition mechanism, in which the cargo-binding sites in the two MyoVa heavy chains are differently protected. Thus, specific and efficient MyoVa activation requires coincident binding of multiple cargo adaptors, revealing an intricate and elegant activity regulation of the motor in response to cargos.


  • Organizational Affiliation

    Brain Research Center, School of Life Sciences, Southern University of Science and Technology, Shenzhen, Guangdong, China.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Unconventional myosin-VaA,
H,
O [auth X],
P [auth Y]
1,828Mus musculusMutation(s): 0 
Gene Names: Myo5a
UniProt & NIH Common Fund Data Resources
Find proteins for Q99104 (Mus musculus)
Explore Q99104 
Go to UniProtKB:  Q99104
IMPC:  MGI:105976
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ99104
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Calmodulin-1
B, C, D, E, F
B, C, D, E, F, G, I, J, K, L, M, N
149Mus musculusMutation(s): 4 
Gene Names: Calm1CalmCamCam1
UniProt
Find proteins for P0DP26 (Mus musculus)
Explore P0DP26 
Go to UniProtKB:  P0DP26
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0DP26
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.78 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONcryoSPARCV3.1.0
MODEL REFINEMENTPHENIX1.18.2

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Natural Science Foundation of China (NSFC)China31971131, 31870757, 32170697, 31800643

Revision History  (Full details and data files)

  • Version 1.0: 2022-12-21
    Type: Initial release
  • Version 1.1: 2024-07-03
    Changes: Data collection, Refinement description