Progestin and adipoQ receptor family member 3 (PAQR3), or Raf Kinase Trapping to Golgi apparatus (RKTG) is a protein that in humans is encoded by the PAQR3gene.[5] It is a member of the progestin and adipoQ receptor (PAQR) family.[6]
PAQR3 is predicted to have seven transmembrane helices and to be localized to the Golgi Apparatus.[7][8] It functions as a tumor suppressor by negatively regulating tumor cell proliferation and migration by inhibiting Raf kinase and AKT pathway.[9][10][11][12][13] PAQR3 was also shown to modulate cholesterolhomeostasis by anchoring the SCAP/SREBP complex to the Golgi under cholesterol depletion conditions.[14]
^Tang YT, Hu T, Arterburn M, Boyle B, Bright JM, Emtage PC, et al. (September 2005). "PAQR proteins: a novel membrane receptor family defined by an ancient 7-transmembrane pass motif". Journal of Molecular Evolution. 61 (3): 372–380. Bibcode:2005JMolE..61..372T. doi:10.1007/s00239-004-0375-2. PMID16044242. S2CID31473802.
^Luo X, Feng L, Jiang X, Xiao F, Wang Z, Feng GS, et al. (September 2008). "Characterization of the topology and functional domains of RKTG". The Biochemical Journal. 414 (3): 399–406. doi:10.1042/BJ20080948. PMID18547165.
^Xie X, Zhang Y, Jiang Y, Liu W, Ma H, Wang Z, et al. (August 2008). "Suppressive function of RKTG on chemical carcinogen-induced skin carcinogenesis in mouse". Carcinogenesis. 29 (8): 1632–1638. doi:10.1093/carcin/bgn139. PMID18550569.
^Zhang Y, Jiang X, Qin X, Ye D, Yi Z, Liu M, et al. (September 2010). "RKTG inhibits angiogenesis by suppressing MAPK-mediated autocrine VEGF signaling and is downregulated in clear-cell renal cell carcinoma". Oncogene. 29 (39): 5404–5415. doi:10.1038/onc.2010.270. PMID20603618.
^Jiang Y, Xie X, Li Z, Wang Z, Zhang Y, Ling ZQ, et al. (April 2011). "Functional cooperation of RKTG with p53 in tumorigenesis and epithelial-mesenchymal transition". Cancer Research. 71 (8): 2959–2968. doi:10.1158/0008-5472.CAN-10-4077. PMID21385899.
^Wang X, Li X, Fan F, Jiao S, Wang L, Zhu L, et al. (November 2012). "PAQR3 plays a suppressive role in the tumorigenesis of colorectal cancers". Carcinogenesis. 33 (11): 2228–2235. doi:10.1093/carcin/bgs245. PMID22828136.
^Fan F, Feng L, He J, Wang X, Jiang X, Zhang Y, et al. (June 2008). "RKTG sequesters B-Raf to the Golgi apparatus and inhibits the proliferation and tumorigenicity of human malignant melanoma cells". Carcinogenesis. 29 (6): 1157–1163. doi:10.1093/carcin/bgn119. PMID18515281.