GPR31 and GPR151 are activated under acidic conditions

Misaki Mashiko; Aya Kurosawa; Yuki Tani; Takashi Tsuji; Shigeki Takeda

doi:10.1093/jb/mvz042

GPR31 and GPR151 are activated under acidic conditions

J Biochem. 2019 Oct 1;166(4):317-322. doi: 10.1093/jb/mvz042.

Authors

Misaki Mashiko¹, Aya Kurosawa¹, Yuki Tani¹, Takashi Tsuji¹, Shigeki Takeda¹

Affiliation

¹ Division of Molecular Science, Department of Chemical Biology, Faculty of Science and Technology, Gunma University, 1-5-1 Tenjin-cho, Kiryu, Gunma, Japan.

PMID: 31119277
DOI: 10.1093/jb/mvz042

Abstract

Recent studies have revealed that not only proton-sensing channels, but also one family of G protein-coupled receptors (GPCRs) comprising OGR1, GPR4, G2A and TDAG8 are responsible for the sensing of extracellular protons, or pH. Here, we report that two other GPCRs, GPR31 and GPR151, were also activated in acidic condition. Elevated pH of assay mixtures resulted in a remarkable increase in [35S]GTPγS binding by GPR31-Giα and GPR151-Giα fusion proteins in a narrow range between pH 6 and 5. Our reporter gene assays with CHO cells expressing recombinant GPR31 or GPR151 also showed that activation was maximal at pH ∼5.8. Although these results from in vitro and cellular assays revealed slightly different pH sensitivities, all of our results indicated that GPR31 and GPR151 sensed extracellular protons equally well as other proton-sensing GPCRs.

Keywords: G protein-coupled receptor; orphan receptor; proton-sensing.