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Structure paper

TitleNucleotide-free structures of KIF20A illuminate atypical mechanochemistry in this kinesin-6.
Journal, issue, pagesOpen Biol, Vol. 13, Issue 9, Page 230122, Year 2023
Publish dateSep 20, 2023
AuthorsFanomezana Moutse Ranaivoson / Vincent Crozet / Matthieu P M H Benoit / Amna Abdalla Mohammed Khalid / Carlos Kikuti / Helena Sirkia / Ahmed El Marjou / Stéphanie Miserey-Lenkei / Ana B Asenjo / Hernando Sosa / Christoph F Schmidt / Steven S Rosenfeld / Anne Houdusse /
PubMed AbstractKIF20A is a critical kinesin for cell division and a promising anti-cancer drug target. The mechanisms underlying its cellular roles remain elusive. Interestingly, unusual coupling between the ...KIF20A is a critical kinesin for cell division and a promising anti-cancer drug target. The mechanisms underlying its cellular roles remain elusive. Interestingly, unusual coupling between the nucleotide- and microtubule-binding sites of this kinesin-6 has been reported, but little is known about how its divergent sequence leads to atypical motility properties. We present here the first high-resolution structure of its motor domain that delineates the highly unusual structural features of this motor, including a long L6 insertion that integrates into the core of the motor domain and that drastically affects allostery and ATPase activity. Together with the high-resolution cryo-electron microscopy microtubule-bound KIF20A structure that reveals the microtubule-binding interface, we dissect the peculiarities of the KIF20A sequence that influence its mechanochemistry, leading to low motility compared to other kinesins. Structural and functional insights from the KIF20A pre-power stroke conformation highlight the role of extended insertions in shaping the motor's mechanochemical cycle. Essential for force production and processivity is the length of the neck linker in kinesins. We highlight here the role of the sequence preceding the neck linker in controlling its backward docking and show that a neck linker four times longer than that in kinesin-1 is required for the activity of this motor.
External linksOpen Biol / PubMed:37726093 / PubMed Central
MethodsEM (helical sym.) / X-ray diffraction
Resolution2.73 - 3.2 Å
Structure data

28787

8f18

EMDB-28787, PDB-8f18:
Apo KIF20A[1-565] class-2 in complex with a microtubule
Method: EM (helical sym.) / Resolution: 3.2 Å

28789

8f1a

EMDB-28789, PDB-8f1a:
Apo KIF20A[1-565] class-1 in complex with a microtubule
Method: EM (helical sym.) / Resolution: 3.1 Å

PDB-8bjs:
Apo KIF20A[55-510] crystal structure
Method: X-RAY DIFFRACTION / Resolution: 2.73 Å

Chemicals

ChemComp-SO4:
SULFATE ION / Sulfate

ChemComp-HOH:
WATER / Water

ChemComp-MG:
Unknown entry

ChemComp-GTP:
GUANOSINE-5'-TRIPHOSPHATE / GTP, energy-carrying molecule*YM / Guanosine triphosphate

ChemComp-GDP:
GUANOSINE-5'-DIPHOSPHATE / GDP, energy-carrying molecule*YM / Guanosine diphosphate

ChemComp-TA1:
TAXOL / medication, chemotherapy*YM / Paclitaxel

Source
  • mus musculus (house mouse)
  • sus scrofa (pig)
KeywordsMOTOR PROTEIN / Kinesin 6 / motor domain / ATPase / mitosis / cytokinesis / Golgi / microtubule / KIF20A / kinesin / motility / tubulin

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