Insights into the activation of Kinesin1 from the molecular characterisation of JIP3/4 binding to Kif5b
Vilela, F.; Chenon, M.; Velours, C.; Andreani, J.; Llinas, P.; Menetrey, J.
Show abstract
Whereas our understanding of kinesin auto-inhibition mechanisms is improving faster, important insights into kinesin activation mechanisms such as those controlled by cargo-motor adaptors are still missing. JIP3 and JIP4 are versatile motor-cargo adaptors for kinesin1 and dynein-dynactin motors enabling bi-directional transport on microtubules. JIP3 activates kinesin1 heavy chains, independently of kinesin1 light chains. In this report, we characterize the molecular details of the binding of the kinesin1 heavy chain, Kif5b to the motor-cargo adaptors, JIP3 and JIP4, using biophysical approaches. The definition of the exact binding site of Kif5b, as well as the specificity of interaction between JIP3 and JIP4 provide new insights into kinesin1 activation.
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