Distinct activation mechanisms of β-arrestin-1 revealed by 19F NMR spectroscopy

Ruibo Zhai, Zhuoqi Wang, Zhaofei Chai, Xiaogang Niu, Conggang Li, Changwen Jin () and Yunfei Hu ()
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Ruibo Zhai: Peking University
Zhuoqi Wang: Peking University
Zhaofei Chai: Chinese Academy of Sciences
Xiaogang Niu: Peking University
Conggang Li: Chinese Academy of Sciences
Changwen Jin: Peking University
Yunfei Hu: Chinese Academy of Sciences

Nature Communications, 2023, vol. 14, issue 1, 1-15

Abstract: Abstract β-Arrestins (βarrs) are functionally versatile proteins that play critical roles in the G-protein-coupled receptor (GPCR) signaling pathways. While it is well established that the phosphorylated receptor tail plays a central role in βarr activation, emerging evidence highlights the contribution from membrane lipids. However, detailed molecular mechanisms of βarr activation by different binding partners remain elusive. In this work, we present a comprehensive study of the structural changes in critical regions of βarr1 during activation using 19F NMR spectroscopy. We show that phosphopeptides derived from different classes of GPCRs display different βarr1 activation abilities, whereas binding of the membrane phosphoinositide PIP2 stabilizes a distinct partially activated conformational state. Our results further unveil a sparsely-populated activation intermediate as well as complex cross-talks between different binding partners, implying a highly multifaceted conformational energy landscape of βarr1 that can be intricately modulated during signaling.

Date: 2023
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DOI: 10.1038/s41467-023-43694-1

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