2LNK

Solution structure of Ca-bound S100A4 in complex with non-muscle myosin IIA


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Asymmetric Mode of Ca(2+)-S100A4 Interaction with Nonmuscle Myosin IIA Generates Nanomolar Affinity Required for Filament Remodeling.

Elliott, P.R.Irvine, A.F.Jung, H.S.Tozawa, K.Pastok, M.W.Picone, R.Badyal, S.K.Basran, J.Rudland, P.S.Barraclough, R.Lian, L.Y.Bagshaw, C.R.Kriajevska, M.Barsukov, I.L.

(2012) Structure 20: 654-666

  • DOI: 10.1016/j.str.2012.02.002

  • PubMed Abstract: 
  • Filament assembly of nonmuscle myosin IIA (NMIIA) is selectively regulated by the small Ca²⁺-binding protein, S100A4, which causes enhanced cell migration and metastasis in certain cancers. Our NMR structure shows that an S100A4 dimer binds to a sing ...

    Filament assembly of nonmuscle myosin IIA (NMIIA) is selectively regulated by the small Ca²⁺-binding protein, S100A4, which causes enhanced cell migration and metastasis in certain cancers. Our NMR structure shows that an S100A4 dimer binds to a single myosin heavy chain in an asymmetrical configuration. NMIIA in the complex forms a continuous helix that stretches across the surface of S100A4 and engages the Ca²⁺-dependent binding sites of each subunit in the dimer. Synergy between these sites leads to a very tight association (K(D) ∼1 nM) that is unique in the S100 family. Single-residue mutations that remove this synergy weaken binding and ameliorate the effects of S100A4 on NMIIA filament assembly and cell spreading in A431 human epithelial carcinoma cells. We propose a model for NMIIA filament disassembly by S100A4 in which initial binding to the unstructured NMIIA tail initiates unzipping of the coiled coil and disruption of filament packing.


    Organizational Affiliation

    Institute of Integrative Biology, BioSciences Building, Crown Street, University of Liverpool, Liverpool L69 7ZB, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Myosin heavy chain, non-muscle IIa
C
39Homo sapiensMutation(s): 0 
Gene Names: MYH9
Find proteins for P35579 (Homo sapiens)
Go to Gene View: MYH9
Go to UniProtKB:  P35579
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Protein S100-A4
A, B
113Homo sapiensMutation(s): 0 
Gene Names: S100A4 (CAPL, MTS1)
Find proteins for P26447 (Homo sapiens)
Go to Gene View: S100A4
Go to UniProtKB:  P26447
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 
  • Olderado: 2LNK Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-04-25
    Type: Initial release