Download MendeleySolution NMR assignments and structure for the dimeric kinesin neck domain.
Seo, D., Kammerer, R.A., Alexandrescu, A.T.(2023) Biomol NMR Assign 17: 301-307
- PubMed: 37861970
- DOI: https://doi.org/10.1007/s12104-023-10159-x
- Primary Citation of Related Structures:
8TT7 - PubMed Abstract:
Kinesin is a motor protein, comprised of two heavy and two light chains that transports cargo along the cytoskeletal microtubule filament network. The heavy chain has a neck domain connecting the ATPase motor head responsible for walking along microtubules, with the stalk and subsequent tail domains that bind cargo. The neck domain consists of a coiled coli homodimer with about five heptad repeats, preceded by a linker region that joins to the ATPase head. Here we report 1 H, 15 N, and 13 C NMR assignments and a solution structure for the kinesin neck domain from rat isoform Kif5c. The calculation of the NMR structure of the homodimer was facilitated by unambiguously assigning sidechain NOEs between heptad a and d positions to interchain contacts, since these positions are too far apart to give sidechain contacts in the monomers. The dimeric coiled coil NMR structure is similar to the previously described X-ray structure, whereas the linker region is disordered in solution but contains a short segment with β-strand propensity- the β-linker. Only the coiled coil is protected from solvent exchange, with ∆G values for hydrogen exchange on the order of 4-6 kcal/mol. The high stability of the hydrogen-bonded α-helical structure makes it unlikely that unzippering of the coiled coil is involved in kinesin walking. Rather, the linker region serves as a flexible hinge between the kinesin head and neck.
Organizational Affiliation:
Department of Molecular and Cell Biology, University of Connecticut, 91 N. Eagleville Road, Storrs, CT, 06269-3125, USA.
