The C-terminal of Roc domain, COR, along with Roc functions as the putative regulator of kinase activity. It functions as a proper GTP-binding protein with a low GTPase activity somehow stimulating the kinase activity [1].

1: Structure of the Roc-COR domain tandem of C. tepidum, a prokaryotic homologue of the human LRRK2 Parkinson kinase. Gotthardt K, Weyand M, Kortholt A, Van Haastert PJ, Wittinghofer A; EMBO J. 2008;27:2239-2249. PMID:18650931