PMID: 23012428 , Related PDB id: 2LW9
Lu Q, Ye F, Wei Z, Wen Z, Zhang M
Antiparallel coiled-coil-mediated dimerization of myosin X.
Proc Natl Acad Sci U S A. 2012 Oct 23;109(43):17388-93. doi:, 10.1073/pnas.1208642109. Epub 2012 Sep 10.
Processive movements of unconventional myosins on actin filaments generally require motor dimerization. A commonly accepted myosin dimerization mechanism is via formation of a parallel coiled-coil dimer by a stretch of amino acid residues immediately carboxyl-terminal to the motor's lever-arm domain. Here, we discover that the predicted coiled-coil region of myosin X forms a highly stable, antiparallel coiled-coil dimer (anti-CC). Disruption of the anti-CC either by single-point mutations or by replacement of the anti-CC with a parallel coiled coil with a similar length compromised the filopodial induction activity of myosin X. We further show that the anti-CC and the single alpha-helical domain of myosin X are connected by a semirigid helical linker. The anti-CC-mediated dimerization may enable myosin X to walk on both single and bundled actin filaments.