4BYF

Crystal structure of human Myosin 1c in complex with calmodulin in the pre-power stroke state

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.74 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.183 

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Literature

Crystal Structure of Human Myosin 1C-the Motor in Glut4 Exocytosis: Implications for Ca(2+) Regulation and 14-3-3 Binding.

Munnich, S., Taft, M.H., Manstein, D.J.

(2014) J Mol Biol 426: 2070

  • DOI: 10.1016/j.jmb.2014.03.004
  • Primary Citation of Related Structures:  
    4BYF

  • PubMed Abstract: 

    • Myosin 1c (Myo1c) plays a key role in supporting motile events that underlie cell migration, vesicle trafficking, insulin-stimulated glucose uptake and hearing. Here, we present the crystal structure of the human Myo1c motor in complex with its light cha ...

    Myosin 1c (Myo1c) plays a key role in supporting motile events that underlie cell migration, vesicle trafficking, insulin-stimulated glucose uptake and hearing. Here, we present the crystal structure of the human Myo1c motor in complex with its light chain calmodulin. Our structure reveals tight interactions of the motor domain with calmodulin bound to the first IQ motif in the neck region. Several of the calmodulin residues contributing to this interaction are also involved in Ca(2+) binding. Contact residues in the motor domain are linked to the central β-sheet and the HO helix, suggesting a mechanism for communicating changes in Ca(2+) binding in the neck region to the actin and nucleotide binding regions of the motor domain. The structural context and the chemical environment of Myo1c mutations that are involved in sensorineural hearing loss in humans are described and their impact on motor function is discussed. We show that a construct consisting of the motor domain of Myo1c and the first IQ motif is sufficient to establish a tight interaction with 14-3-3β (KD=0.9 μM) and present the model of a double-headed Myo1c-14-3-3 complex. This complex has been implicated in the exocytosis of glucose transporter 4 storage vesicles during insulin-stimulated glucose uptake.

    Organizational Affiliation: 

    Institute for Biophysical Chemistry, Hannover Medical School, Carl-Neuberg-Str. 1, 30625 Hannover, Germany. Electronic address: manstein.dietmar@mh-hannover.de.



Macromolecules
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(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
UNCONVENTIONAL MYOSIN-IC A, C725Homo sapiensMutation(s): 0 
Gene Names: MYO1C
EC: 3.6.4.1
Find proteins for O00159 (Homo sapiens)
Explore O00159 
Go to UniProtKB:  O00159
NIH Common Fund Data Resources
PHAROS:  O00159
GTEx:  ENSG00000197879
Protein Feature View
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  • Reference Sequence
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(by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
CALMODULIN B, D149Homo sapiensMutation(s): 0 
Gene Names: CALM1, CALM, CAM, CAM1
Find proteins for P0DP23 (Homo sapiens)
Explore P0DP23 
Go to UniProtKB:  P0DP23
NIH Common Fund Data Resources
PHAROS:  P0DP23
GTEx:  ENSG00000198668
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
AOV
Query on AOV
Download Ideal Coordinates CCD File 
A, C
ADP ORTHOVANADATE
C10 H17 N5 O14 P2 V
SWCHWRVRYDCWAN-AZGWGOJFSA-J		 Ligand Interaction
MG
Query on MG
Download Ideal Coordinates CCD File 
A, C, D
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.74 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.183 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 59.58α = 90
b = 158.45β = 91.56
c = 114.34γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XDSdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-03-26
    Type: Initial release
  • Version 1.1: 2014-05-14
    Changes: Database references