PMID: 24097982

Authors:

Nascimento AF, Trindade DM, Tonoli CC, de Giuseppe PO, Assis LH, Honorato RV, de Oliveira PS, Mahajan P, Burgess-Brown NA, von Delft F, Larson RE, Murakami MT

Title:

Structural insights into functional overlapping and differentiation among myosin V motors.

Journal:

J Biol Chem. 2013 Oct 4.

Abstract:

Myosin V (MyoV) motors have been implicated in the intracellular transport of diverse cargoes including vesicles, organelles, RNA-protein complexes and regulatory proteins. Here, we have solved the cargo-binding domain (CBD) structures of the three human MyoV paralogs (Va, Vb and Vc), revealing subtle structural changes that drive functional differentiation and a novel redox mechanism controlling the CBD dimerization process, which is unique for the MyoVc subclass. Moreover, the cargo- and motor-binding sites were structurally assigned indicating the conservation of residues involved in the recognition of adaptors for peroxisome transport and providing high-resolution insights into motor domain (MD) inhibition by CBD. These results contribute to understanding the structural requirements for cargo transport, auto-inhibition and regulatory mechanisms in myosin V motors.