pfam12781: AAA_9 (This model is not part of the current CDD release)
ATP-binding dynein motor region
This domain is found in human cytoplasmic dynein-2 proteins. Cytoplasmic dynein-2 (dynein-2) performs intraflagellar transport and is associated with human skeletal ciliopathies. Dyneins share a conserved motor domain that couples cycles of ATP hydrolyzis with conformational changes to produce movement. Structural analysis reveal that the motor's ring consists of six AAA+ domains (ATPases associated with various cellular activities (AAA1-AAA6). This is the fifth AAA+ domain subdomain AAA5S. Structural analysis reveal that it is the coiled-coil buttress interface. The relative movement of AAA5S together with the stalk (AAA4S), is coupled to rearrangements in the AAA+ ring. Closure of the AAA1 site and the rigid body movement of AAA2-AAA4 force the AAA4/AAA5 interface to close and the AAA6L subdomain to rotate towards the ring centre. The AAA5S subdomain rotates as a unit together with AAA6L, and this movement pulls the buttress relative to the stalk.
Jiyao W et al.(2023). "The conserved domain database in 2023.",