5OGC

Molecular basis of human kinesin-8 function and inhibition


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.8 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural basis of human kinesin-8 function and inhibition.

Locke, J.Joseph, A.P.Pena, A.Mockel, M.M.Mayer, T.U.Topf, M.Moores, C.A.

(2017) Proc. Natl. Acad. Sci. U.S.A. 114: E9539-E9548

  • DOI: 10.1073/pnas.1712169114
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Kinesin motors play diverse roles in mitosis and are targets for antimitotic drugs. The clinical significance of these motors emphasizes the importance of understanding the molecular basis of their function. Equally important, investigations into the ...

    Kinesin motors play diverse roles in mitosis and are targets for antimitotic drugs. The clinical significance of these motors emphasizes the importance of understanding the molecular basis of their function. Equally important, investigations into the modes of inhibition of these motors provide crucial information about their molecular mechanisms. Kif18A regulates spindle microtubules through its dual functionality, with microtubule-based stepping and regulation of microtubule dynamics. We investigated the mechanism of Kif18A and its inhibition by the small molecule BTB-1. The Kif18A motor domain drives ATP-dependent plus-end microtubule gliding, and undergoes conformational changes consistent with canonical mechanisms of plus-end-directed motility. The Kif18A motor domain also depolymerizes microtubule plus and minus ends. BTB-1 inhibits both of these microtubule-based Kif18A activities. A reconstruction of BTB-1-bound, microtubule-bound Kif18A, in combination with computational modeling, identified an allosteric BTB-1-binding site near loop5, where it blocks the ATP-dependent conformational changes that we characterized. Strikingly, BTB-1 binding is close to that of well-characterized Kif11 inhibitors that block tight microtubule binding, whereas BTB-1 traps Kif18A on the microtubule. Our work highlights a general mechanism of kinesin inhibition in which small-molecule binding near loop5 prevents a range of conformational changes, blocking motor function.


    Organizational Affiliation

    Institute of Structural and Molecular Biology, Department of Biological Sciences, Birkbeck College, London, WC1E 7HX, United Kingdom.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Kinesin-like protein KIF18A
K
377Homo sapiensGene Names: KIF18A
Find proteins for Q8NI77 (Homo sapiens)
Go to Gene View: KIF18A
Go to UniProtKB:  Q8NI77
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Tubulin alpha chain
A
451Bos taurus
Find proteins for P81947 (Bos taurus)
Go to UniProtKB:  P81947
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Tubulin beta chain
B
445Sus scrofa
Find proteins for P02554 (Sus scrofa)
Go to UniProtKB:  P02554
Small Molecules
Ligands 6 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GDP
Query on GDP

Download SDF File 
Download CCD File 
B
GUANOSINE-5'-DIPHOSPHATE
C10 H15 N5 O11 P2
QGWNDRXFNXRZMB-UUOKFMHZSA-N
 Ligand Interaction
9V5
Query on 9V5

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Download CCD File 
K
4-chloranyl-2-nitro-1-(phenylsulfonyl)benzene
BIS-TRIS BUFFER
C12 H8 Cl N O4 S
VZDUQPHKUBZMLW-UHFFFAOYSA-N
 Ligand Interaction
ZN
Query on ZN

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Download CCD File 
A
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
GTP
Query on GTP

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Download CCD File 
A
GUANOSINE-5'-TRIPHOSPHATE
C10 H16 N5 O14 P3
XKMLYUALXHKNFT-UUOKFMHZSA-N
 Ligand Interaction
MG
Query on MG

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A
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
TA1
Query on TA1

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Download CCD File 
B
TAXOL
C47 H51 N O14
RCINICONZNJXQF-MZXODVADSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.8 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationCountryGrant Number
Cancer Research UKUnited KingdomC33336/A13177
Worldwide Cancer ResearchUnited Kingdom16-0037

Revision History 

  • Version 1.0: 2017-10-25
    Type: Initial release
  • Version 1.1: 2017-11-08
    Type: Database references
  • Version 1.2: 2017-11-15
    Type: Database references