6ZPI

Microtubule complexed with Kif15 motor domain. Symmetrised asymmetric unit

Summary for 6ZPI

• Entry DOI: 10.2210/pdb6zpi/pdb
• Related: 6ZPG 6ZPH
• EMDB information: 11338 11339 11340
• Descriptor: Kinesin-like protein KIF15, Tubulin alpha-1B chain, Tubulin beta chain, ... (8 entities in total)
• Functional Keywords: kinesin, microtubules, kinesin binding protein, kbp, motor protein
• Biological source: Homo sapiens (Human); More
• Total number of polymer chains: 3
• Total formula weight: 140510.57

Authors

Atherton, J.,Hummel, J.J.A.,Olieric, N.,Locke, J.,Pena, A.,Rosenfeld, S.S.,Steinmetz, M.O.,Hoogenraad, C.C.,Moores, C.A. (deposition date: 2020-07-08, release date: 2020-12-30, Last modification date: 2024-11-06)

Primary citation

Atherton, J.,Hummel, J.J.,Olieric, N.,Locke, J.,Pena, A.,Rosenfeld, S.S.,Steinmetz, M.O.,Hoogenraad, C.C.,Moores, C.A.
The mechanism of kinesin inhibition by kinesin-binding protein.
Elife, 9:-, 2020

PubMed Abstract: Subcellular compartmentalisation is necessary for eukaryotic cell function. Spatial and temporal regulation of kinesin activity is essential for building these local environments via control of intracellular cargo distribution. Kinesin-binding protein (KBP) interacts with a subset of kinesins via their motor domains, inhibits their microtubule (MT) attachment, and blocks their cellular function. However, its mechanisms of inhibition and selectivity have been unclear. Here we use cryo-electron microscopy to reveal the structure of KBP and of a KBP-kinesin motor domain complex. KBP is a tetratricopeptide repeat-containing, right-handed α-solenoid that sequesters the kinesin motor domain's tubulin-binding surface, structurally distorting the motor domain and sterically blocking its MT attachment. KBP uses its α-solenoid concave face and edge loops to bind the kinesin motor domain, and selected structure-guided mutations disrupt KBP inhibition of kinesin transport in cells. The KBP-interacting motor domain surface contains motifs exclusively conserved in KBP-interacting kinesins, suggesting a basis for kinesin selectivity.

PubMed: 33252036
DOI: 10.7554/eLife.61481

Experimental method

ELECTRON MICROSCOPY (4.5 Å)