The synthetic peptide derived from the NH2-terminal extracellular region of an orphan G protein-coupled receptor, GPR1, preferentially inhibits infection of X4 HIV-1.
Jinno-Oue A, Shimizu N, Soda Y, Tanaka A, Ohtsuki T, Kurosaki D, Suzuki Y, Hoshino H. J Biol Chem. 2005 Sep 2; 280(35):30924-34. Epub 2005 May 26.