4LL8

Complex of carboxy terminal domain of Myo4p and She3p middle fragment


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.578 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.224 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure of a myosinbulletadaptor complex and pairing by cargo.

Shi, H.Singh, N.Esselborn, F.Blobel, G.

(2014) Proc.Natl.Acad.Sci.USA 111: E1082-E1090

  • DOI: 10.1073/pnas.1401428111
  • Primary Citation of Related Structures:  4LL6, 4LL7

  • PubMed Abstract: 
  • Myosin 4 protein (Myo4p), one of five distinct myosins of yeast, is dedicated to cytoplasmic transport of two types of cargos, zipcoded messenger ribonucleoprotein particles (mRNPs) and tubular endoplasmic reticulum (tER). Neither cargo binds directl ...

    Myosin 4 protein (Myo4p), one of five distinct myosins of yeast, is dedicated to cytoplasmic transport of two types of cargos, zipcoded messenger ribonucleoprotein particles (mRNPs) and tubular endoplasmic reticulum (tER). Neither cargo binds directly to Myo4p. Instead, swi5p-dependent HO expression 3 protein (She3p) serves as an "adaptor" that contains three binding modules, one for Myo4p and one each for zipcoded mRNP and tER. The assembly of a transport-competent motor complex is poorly understood. Here, we report that Myo4p•She3p forms a stable 1:2 heterotrimer in solution. In the Myo4p•She3p crystal structure, Myo4p's C-terminal domain (CTD) assumes a lobster claw-shaped form, the minor prong of which adheres to a pseudocoiled-coil region of She3p. The extensive Myo4p•She3p interactome buries 3,812 Å(2) surface area and is primarily hydrophobic. Because the Myo4p•She3p heterotrimer contains only one myosin molecule, it is not transport-competent. By stepwise reconstitution, we found a single molecule of synthetic oligonucleotide (representing the mRNA zipcode element) bound to a single tetramer of zipcode binding protein She2p to be sufficient for Myo4p•She3p dimerization. Therefore, cargo initiates cross-linking of two Myo4p•She3p heterotrimers to an ensemble that contains two myosin molecules obligatory for movement. An additional crystal structure comprising an overlapping upstream portion of She3p showed continuation of the pseudocoiled-coil structure and revealed another highly conserved surface region. We suggest this region as a candidate binding site for a yet unidentified tER ligand. We propose a model whereby zipcoded mRNP and/or tER ligands couple two Myo4p•She3p heterotrimers and thereby generate a transport-competent motor complex either for separate transport or cotransport of these two cargos.


    Organizational Affiliation

    Laboratory of Cell Biology and Howard Hughes Medical Institute, The Rockefeller University, New York, NY 10065.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Myosin-4
A
539Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Gene Names: MYO4 (SHE1)
Find proteins for P32492 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to UniProtKB:  P32492
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
SWI5-dependent HO expression protein 3
E, B
235Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Gene Names: SHE3
Find proteins for P38272 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to UniProtKB:  P38272
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.578 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.224 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 272.013α = 90.00
b = 38.116β = 125.24
c = 183.991γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
SCALEPACKdata scaling
CNSrefinement
HKL-2000data reduction
ADSCdata collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-02-12
    Type: Initial release
  • Version 1.1: 2014-05-21
    Type: Database references
  • Version 1.2: 2017-08-23
    Type: Refinement description, Source and taxonomy