Crystal Structure of the G.intestinalis Kinesin 2 GiKIN2a Motor Domain

Experimental Data Snapshot

  • Resolution: 1.60 Å
  • R-Value Free: 0.224 
  • R-Value Work: 0.203 
  • R-Value Observed: 0.203 

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High-Resolution Crystal Structure and in Vivo Function of a Kinesin-2 Homologue in Giardia Intestinalis.

Hoeng, J.C.Dawson, S.C.House, S.A.Sagolla, M.S.Pham, J.K.Mancuso, J.J.Loewe, J.Cande, W.Z.

(2008) Mol Biol Cell 19: 3124

  • DOI: https://doi.org/10.1091/mbc.e07-11-1156
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    A critical component of flagellar assembly, the kinesin-2 heterotrimeric complex powers the anterograde movement of proteinaceous rafts along the outer doublet of axonemes in intraflagellar transport (IFT). We present the first high-resolution structures of a kinesin-2 motor domain and an ATP hydrolysis-deficient motor domain mutant from the parasitic protist Giardia intestinalis. The high-resolution crystal structures of G. intestinalis wild-type kinesin-2 (GiKIN2a) motor domain, with its docked neck linker and the hydrolysis-deficient mutant GiKIN2aT104N were solved in a complex with ADP and Mg(2+) at 1.6 and 1.8 A resolutions, respectively. These high-resolution structures provide unique insight into the nucleotide coordination within the active site. G. intestinalis has eight flagella, and we demonstrate that both kinesin-2 homologues and IFT proteins localize to both cytoplasmic and membrane-bound regions of axonemes, with foci at cell body exit points and the distal flagellar tips. We demonstrate that the T104N mutation causes GiKIN2a to act as a rigor mutant in vitro. Overexpression of GiKIN2aT104N results in significant inhibition of flagellar assembly in the caudal, ventral, and posterolateral flagellar pairs. Thus we confirm the conserved evolutionary structure and functional role of kinesin-2 as the anterograde IFT motor in G. intestinalis.

  • Organizational Affiliation

    Medical Research Council Laboratory of Molecular Biology, Cambridge CB2 2QH, United Kingdom.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
350Giardia intestinalisMutation(s): 0 
Find proteins for A8BKD1 (Giardia intestinalis (strain ATCC 50803 / WB clone C6))
Explore A8BKD1 
Go to UniProtKB:  A8BKD1
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA8BKD1
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.60 Å
  • R-Value Free: 0.224 
  • R-Value Work: 0.203 
  • R-Value Observed: 0.203 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 44.875α = 89.3
b = 48.223β = 87.52
c = 72.021γ = 84.29
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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-07-08
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance