5f4y

Publication Abstract from PubMed

Shroom-mediated remodeling of the actomyosin cytoskeleton is a critical driver of cellular shape and tissue morphology that underlies the development of many tissues, including the neural tube, eye, intestines, and vasculature. Shroom uses a conserved SD2 domain to direct the subcellular localization of Rho-kinase (Rock) which in turn drives changes in the cytoskeleton and cellular morphology through its ability to phosphorylate and activate non-muscle myosin II. Here, we present the structure of the human Shroom-Rock binding module, revealing an unexpected stoichiometry for Shrm in which two Shrm SD2 domains bind independent surfaces on Rock. Mutation of interfacial residues impaired Shroom-Rock binding in vitro, and resulted in altered remodeling of the cytoskeleton and loss of Shroom-mediated changes in cellular morphology. Additionally, we provide the first direct evidence that Shroom can function as a Rock activator. These data provide molecular insight into the Shroom-Rock interface and demonstrate that Shroom directly participates in regulating cytoskeletal dynamics, adding to its known role in Rock localization.

Structure of the Shroom-Rho kinase complex reveals a binding interface with monomeric Shroom that regulates cell morphology and stimulates kinase activity.,Zalewski JK, Mo JH, Heber S, Heroux A, Gardner RG, Hildebrand JD, VanDemark AP J Biol Chem. 2016 Oct 10. pii: jbc.M116.738559. PMID:27758857^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.