5JX1

The neck-linker and alpha 7 helix of Mus musculus KIF3A fused to EB1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.67 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.192 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Family-specific Kinesin Structures Reveal Neck-linker Length Based on Initiation of the Coiled-coil.

Phillips, R.K.Peter, L.G.Gilbert, S.P.Rayment, I.

(2016) J.Biol.Chem. 291: 20372-20386

  • DOI: 10.1074/jbc.M116.737577
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Kinesin-1, -2, -5, and -7 generate processive hand-over-hand 8-nm steps to transport intracellular cargoes toward the microtubule plus end. This processive motility requires gating mechanisms to coordinate the mechanochemical cycles of the two motor ...

    Kinesin-1, -2, -5, and -7 generate processive hand-over-hand 8-nm steps to transport intracellular cargoes toward the microtubule plus end. This processive motility requires gating mechanisms to coordinate the mechanochemical cycles of the two motor heads to sustain the processive run. A key structural element believed to regulate the degree of processivity is the neck-linker, a short peptide of 12-18 residues, which connects the motor domain to its coiled-coil stalk. Although a shorter neck-linker has been correlated with longer run lengths, the structural data to support this hypothesis have been lacking. To test this hypothesis, seven kinesin structures were determined by x-ray crystallography. Each included the neck-linker motif, followed by helix α7 that constitutes the start of the coiled-coil stalk. In the majority of the structures, the neck-linker length differed from predictions because helix α7, which initiates the coiled-coil, started earlier in the sequence than predicted. A further examination of structures in the Protein Data Bank reveals that there is a great disparity between the predicted and observed starting residues. This suggests that an accurate prediction of the start of a coiled-coil is currently difficult to achieve. These results are significant because they now exclude simple comparisons between members of the kinesin superfamily and add a further layer of complexity when interpreting the results of mutagenesis or protein fusion. They also re-emphasize the need to consider factors beyond the kinesin neck-linker motif when attempting to understand how inter-head communication is tuned to achieve the degree of processivity required for cellular function.


    Organizational Affiliation

    From the Department of Biochemistry, University of Wisconsin, Madison, Wisconsin 53706 and.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Chimera protein of Kinesin-like protein KIF3A and Microtubule-associated protein RP/EB family member 1
A
75Homo sapiensMus musculus
This entity is chimeric
Mutation(s): 0 
Gene Names: MAPRE1, Kif3a (Kif3)
Find proteins for Q15691 (Homo sapiens)
Go to Gene View: MAPRE1
Go to UniProtKB:  Q15691
Find proteins for P28741 (Mus musculus)
Go to UniProtKB:  P28741
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.67 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.192 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 45.812α = 90.00
b = 80.534β = 90.00
c = 36.834γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-3000data scaling
PHASERphasing
HKL-3000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2016-08-03
    Type: Initial release
  • Version 1.1: 2016-08-10
    Type: Database references
  • Version 1.2: 2016-10-05
    Type: Database references