3VHX

The crystal structure of Arf6-MKLP1 (Mitotic kinesin-like protein 1) complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.81 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.201 
  • R-Value Observed: 0.203 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structural basis for Arf6-MKLP1 complex formation on the Flemming body responsible for cytokinesis

Makyio, H.Ohgi, M.Takei, T.Takahashi, S.Takatsu, H.Katoh, Y.Hanai, A.Ueda, T.Kanaho, Y.Xie, Y.Shin, H.W.Kamikubo, H.Kataoka, M.Kawasaki, M.Kato, R.Wakatsuki, S.Nakayama, K.

(2012) EMBO J 31: 2590-2603

  • DOI: 10.1038/emboj.2012.89
  • Primary Citation of Related Structures:  
    3VHX

  • PubMed Abstract: 
  • A small GTPase, Arf6, is involved in cytokinesis by localizing to the Flemming body (the midbody). However, it remains unknown how Arf6 contributes to cytokinesis. Here, we demonstrate that Arf6 directly interacts with mitotic kinesin-like protein 1 (MKLP1), a Flemming body-localizing protein essential for cytokinesis ...

    A small GTPase, Arf6, is involved in cytokinesis by localizing to the Flemming body (the midbody). However, it remains unknown how Arf6 contributes to cytokinesis. Here, we demonstrate that Arf6 directly interacts with mitotic kinesin-like protein 1 (MKLP1), a Flemming body-localizing protein essential for cytokinesis. The crystal structure of the Arf6-MKLP1 complex reveals that MKLP1 forms a homodimer flanked by two Arf6 molecules, forming a 2:2 heterotetramer containing an extended β-sheet composed of 22 β-strands that spans the entire heterotetramer, suitable for interaction with a concave membrane surface at the cleavage furrow. We show that, during cytokinesis, Arf6 is first accumulated around the cleavage furrow and, prior to abscission, recruited onto the Flemming body via interaction with MKLP1. We also show by structure-based mutagenesis and siRNA-mediated knockdowns that the complex formation is required for completion of cytokinesis. A model based on these results suggests that the Arf6-MKLP1 complex plays a crucial role in cytokinesis by connecting the microtubule bundle and membranes at the cleavage plane.


    Organizational Affiliation

    Structural Biology Research Center, Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Ibaraki, Japan.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ADP-ribosylation factor 6A, C, E, G172Mus musculusMutation(s): 1 
Gene Names: Arf6
UniProt
Find proteins for P62331 (Mus musculus)
Explore P62331 
Go to UniProtKB:  P62331
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Kinesin-like protein KIF23B, D, F, H120Homo sapiensMutation(s): 0 
Gene Names: KIF23KNSL5MKLP1
UniProt & NIH Common Fund Data Resources
Find proteins for Q02241 (Homo sapiens)
Explore Q02241 
Go to UniProtKB:  Q02241
PHAROS:  Q02241
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.81 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.201 
  • R-Value Observed: 0.203 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 45.743α = 90
b = 174.573β = 98.74
c = 76.814γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
PDB_EXTRACTdata extraction
HKL-2000data collection
HKL-2000data reduction
HKL-2000data scaling
PHASERphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-05-16
    Type: Initial release
  • Version 1.1: 2013-06-19
    Changes: Database references