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The light chains of kinesin-1 are autoinhibited

DOI: 10.1073/pnas.1520817113 DOI Help
PMID: 26884162 PMID Help

Authors: Yan Y. Yip (King’s College London) , Stefano Pernigo (King's College London) , Anneri Sanger (King’s College London) , Mengjia Xu (King’s College London) , Maddy Parsons (King’s College London) , Roberto Steiner (King's College London) , Mark P. Dodding (King’s College London)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Proceedings Of The National Academy Of Sciences , VOL 113 (9)

State: Published (Approved)
Published: February 2016

Abstract: The light chains (KLCs) of the microtubule motor kinesin-1 bind cargoes and regulate its activity. Through their tetratricopeptide repeat domain (KLCTPR), they can recognize short linear peptide motifs found in many cargo proteins characterized by a central tryptophan flanked by aspartic/glutamic acid residues (W-acidic). Using a fluorescence resonance energy transfer biosensor in combination with X-ray crystallographic, biochemical, and biophysical approaches, we describe how an intramolecular interaction between the KLC2TPR domain and a conserved peptide motif within an unstructured region of the molecule, partly occludes the W-acidic binding site on the TPR domain. Cargo binding displaces this interaction, effecting a global conformational change in KLCs resulting in a more extended conformation. Thus, like the motor-bearing kinesin heavy chains, KLCs exist in a dynamic conformational state that is regulated by self-interaction and cargo binding. We propose a model by which, via this molecular switch, W-acidic cargo binding regulates the activity of the holoenzyme.

Journal Keywords: Kinesin; KLC; TPR domain; microtubule motor; cytoskeleton

Subject Areas: Biology and Bio-materials


Instruments: I24-Microfocus Macromolecular Crystallography

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