8F18

Apo KIF20A[1-565] class-2 in complex with a microtubule

Summary for 8F18

• Entry DOI: 10.2210/pdb8f18/pdb
• EMDB information: 28787
• Descriptor: Tubulin alpha-1B chain, Tubulin beta-2B chain, Kinesin-like protein KIF20A, ... (7 entities in total)
• Functional Keywords: kif20a, kinesin, motility, microtubule, tubulin, motor protein
• Biological source: Mus musculus (house mouse); More
• Total number of polymer chains: 3
• Total formula weight: 166137.13

Authors

Benoit, M.P.M.H.,Asenjo, A.B.,Crozet, V.,Ranaivoson, F.M.,Houdusse, A.,Sosa, H. (deposition date: 2022-11-04, release date: 2023-09-20, Last modification date: 2023-10-04)

Primary citation

Ranaivoson, F.M.,Crozet, V.,Benoit, M.P.M.H.,Abdalla Mohammed Khalid, A.,Kikuti, C.,Sirkia, H.,El Marjou, A.,Miserey-Lenkei, S.,Asenjo, A.B.,Sosa, H.,Schmidt, C.F.,Rosenfeld, S.S.,Houdusse, A.
Nucleotide-free structures of KIF20A illuminate atypical mechanochemistry in this kinesin-6.
Open Biology, 13:230122-230122, 2023

PubMed Abstract: 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.

PubMed: 37726093
DOI: 10.1098/rsob.230122

Experimental method

ELECTRON MICROSCOPY (3.2 Å)