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-Structure paper
タイトル | Constitutive signal bias mediated by the human GHRHR splice variant 1. |
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ジャーナル・号・ページ | Proc Natl Acad Sci U S A, Vol. 118, Issue 40, Year 2021 |
掲載日 | 2021年10月5日 |
![]() | Zhaotong Cong / Fulai Zhou / Chao Zhang / Xinyu Zou / Huibing Zhang / Yuzhe Wang / Qingtong Zhou / Xiaoqing Cai / Qiaofeng Liu / Jie Li / Lijun Shao / Chunyou Mao / Xi Wang / Jihong Wu / Tian Xia / Li-Hua Zhao / Hualiang Jiang / Yan Zhang / H Eric Xu / Xi Cheng / Dehua Yang / Ming-Wei Wang / ![]() |
PubMed 要旨 | Alternative splicing of G protein-coupled receptors has been observed, but their functions are largely unknown. Here, we report that a splice variant (SV1) of the human growth hormone-releasing ...Alternative splicing of G protein-coupled receptors has been observed, but their functions are largely unknown. Here, we report that a splice variant (SV1) of the human growth hormone-releasing hormone receptor (GHRHR) is capable of transducing biased signal. Differing only at the receptor N terminus, GHRHR predominantly activates G while SV1 selectively couples to β-arrestins. Based on the cryogenic electron microscopy structures of SV1 in the state or GHRH-bound state in complex with the G protein, molecular dynamics simulations reveal that the N termini of GHRHR and SV1 differentiate the downstream signaling pathways, G versus β-arrestins. As suggested by mutagenesis and functional studies, it appears that GHRH-elicited signal bias toward β-arrestin recruitment is constitutively mediated by SV1. The level of SV1 expression in prostate cancer cells is also positively correlated with ERK1/2 phosphorylation but negatively correlated with cAMP response. Our findings imply that constitutive signal bias may be a mechanism that ensures cancer cell proliferation. |
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手法 | EM (単粒子) |
解像度 | 2.6 - 3.29 Å |
構造データ | EMDB-31824, PDB-7v9l: EMDB-31825, PDB-7v9m: |
由来 |
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![]() | STRUCTURAL PROTEIN / class B GPCR / receptor bias / cancer / cell proliferation |