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Protein kinase C-related kinase homology region 1 (HR1) Rho-binding domain of Rho-associated coiled-coil containing protein kinase 1 ROCK1 is a serine/threonine kinase and is preferentially expressed in the liver, lung, spleen, testes, and kidney. It mediates signaling from Rho to the actin cytoskeleton. It is implicated in the development of cardiac fibrosis, cardiomyocyte apoptosis, and hyperglycemia. Mice deficient with ROCK1 display eyelids open at birth (EOB) and omphalocele phenotypes due to the disorganization of actin filaments in the eyelids and the umbilical ring. ROCK1 contains an N-terminal extension, a catalytic kinase domain, and a long C-terminal extension, which contains a Rho-binding HR1 domain and a pleckstrin homology (PH) domain. It is auto-inhibited by HR1 and PH domains interacting with the catalytic domain. HR1 domains are anti-parallel coiled-coil (ACC) domains that bind small GTPases from the Rho family. |
Jiyao W et al.(2023). "The conserved domain database in 2023.",