8TT7 image
Deposition Date 2023-08-12
Release Date 2023-11-01
Last Version Date 2024-05-15
Entry Detail
PDB ID:
8TT7
Keywords:
Title:
NMR Assignments and Structure for the Dimeric Kinesin Neck Domain
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Conformers Calculated:
50
Conformers Submitted:
20
Selection Criteria:
structures with the lowest energy
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Kinesin heavy chain isoform 5C
Gene (Uniprot):Kif5c
Chain IDs:A, B
Chain Length:54
Number of Molecules:2
Biological Source:Rattus norvegicus
Ligand Molecules
Primary Citation
Solution NMR assignments and structure for the dimeric kinesin neck domain.
Biomol.Nmr Assign. 17 301 307 (2023)
PMID: 37861970 DOI: 10.1007/s12104-023-10159-x

Abstact

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 1H, 15N, and 13C 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.

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Primary Citation of related structures