This family of proteins includes muscle-related coiled-coil protein (MURC), protein kinase C delta-binding protein (PRKCDBP), polymerase I and transcript release factor (PTRF) and serum deprivation-response protein (SDPR). MURC activates the Rho/ROCK pathway [1]. PRKCDBP appears to act as an immune potentiator [2]. PTRF is involved in caveolae formation and function [3]. SDPR is involved in the targetting of protein kinase Calpha to caveolae [4].

1: MURC, a muscle-restricted coiled-coil protein that modulates the Rho/ROCK pathway, induces cardiac dysfunction and conduction disturbance. Ogata T, Ueyama T, Isodono K, Tagawa M, Takehara N, Kawashima T, Harada K, Takahashi T, Shioi T, Matsubara H, Oh H; Mol Cell Biol. 2008;28:3424-3436. PMID:18332105

2: Differential regulation of the protein tyrosine kinase activity following interleukin-2 (IL-2), interferron gamma (IFN-gamma) and SRBC administration in brain tumor-induced conditions: SRBC acting as a dual potentiator in regulating the cytokine profile. Bhattacharjee M, Sarkar S, Dutta S, Begum Z, Roy UR, Chaudhuri S, Chaudhuri S; Cancer Biol Ther. 2004;3:755-760. PMID:15197346

3: PTRF-Cavin, a conserved cytoplasmic protein required for caveola formation and function. Hill MM, Bastiani M, Luetterforst R, Kirkham M, Kirkham A, Nixon SJ, Walser P, Abankwa D, Oorschot VM, Martin S, Hancock JF, Parton RG; Cell. 2008;132:113-124. PMID:18191225

4: Targeting of protein kinase Calpha to caveolae. Mineo C, Ying YS, Chapline C, Jaken S, Anderson RG; J Cell Biol. 1998;141:601-610. PMID:9566962