Dataset Information

Crystal Structure of ?-Arrestin 2 in Complex with CXCR7 Phosphopeptide.

ABSTRACT: ?-Arrestins (?arrs) critically regulate G-protein-coupled receptor (GPCR) signaling and trafficking. ?arrs have two isoforms, ?arr1 and ?arr2. Receptor phosphorylation is a key determinant for the binding of ?arrs, and understanding the intricate details of receptor-?arr interaction is the next frontier in GPCR structural biology. The high-resolution structure of active ?arr1 in complex with a phosphopeptide derived from GPCR has been revealed, but that of ?arr2 remains elusive. Here, we present a 2.3-Å crystal structure of ?arr2 in complex with a phosphopeptide (C7pp) derived from the carboxyl terminus of CXCR7. The structural analysis of C7pp-bound ?arr2 reveals key differences from the previously determined active conformation of ?arr1. One of the key differences is that C7pp-bound ?arr2 shows a relatively small inter-domain rotation. Antibody-fragment-based conformational sensor and hydrogen/deuterium exchange experiments further corroborated the structural features of ?arr2 and suggested that ?arr2 adopts a range of inter-domain rotations.

SUBMITTER: Min K

PROVIDER: S-EPMC7116037 | biostudies-literature | 2020 Sep

REPOSITORIES: biostudies-literature

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Crystal Structure of β-Arrestin 2 in Complex with CXCR7 Phosphopeptide.

Min Kyungjin K Yoon Hye-Jin HJ Park Ji Young JY Baidya Mithu M Dwivedi-Agnihotri Hemlata H Maharana Jagannath J Chaturvedi Madhu M Chung Ka Young KY Shukla Arun K AK Lee Hyung Ho HH

Structure (London, England : 1993) 20200623 9

β-Arrestins (βarrs) critically regulate G-protein-coupled receptor (GPCR) signaling and trafficking. βarrs have two isoforms, βarr1 and βarr2. Receptor phosphorylation is a key determinant for the binding of βarrs, and understanding the intricate details of receptor-βarr interaction is the next frontier in GPCR structural biology. The high-resolution structure of active βarr1 in complex with a phosphopeptide derived from GPCR has been revealed, but that of βarr2 remains elusive. Here, we present ...[more]

PMID: 32579945

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Project description:Chemokine CXCL12 promotes growth and metastasis of more than 20 different human cancers, as well as pathogenesis of other common diseases. CXCL12 binds two different receptors, CXCR4 and CXCR7, both of which recruit and signal through the cytosolic adapter protein ?-arrestin 2. Differences in CXCL12-dependent recruitment of ?-arrestin 2 in cells expressing one or both receptors remain poorly defined. To quantitatively investigate parameters controlling association of ?-arrestin 2 with CXCR4 or CXCR7 in cells co-expressing both receptors, we used a systems biology approach combining real-time, multi-spectral luciferase complementation imaging with computational modeling. Cells expressing only CXCR4 maintain low basal association with ?-arrestin 2, and CXCL12 induces a rapid, transient increase in this interaction. In contrast, cells expressing only CXCR7 have higher basal association with ?-arrestin 2 and exhibit more gradual, prolonged recruitment of ?-arrestin 2 in response to CXCL12. We developed and fit a data-driven computational model for association of either CXCR4 or CXCR7 with ?-arrestin 2 in cells expressing only one type of receptor. We then experimentally validated model predictions that co-expression of CXCR4 and CXCR7 on the same cell substantially decreases both the magnitude and duration of CXCL12-regulated recruitment of ?-arrestin 2 to CXCR4. Co-expression of both receptors on the same cell only minimally alters recruitment of ?-arrestin 2 to CXCR7. In silico experiments also identified ?-arrestin 2 as a limiting factor in cells expressing both receptors, establishing that CXCR7 wins the "competition" with CXCR4 for CXCL12 and recruitment of ?-arrestin 2. These results reveal how competition for ?-arrestin 2 controls integrated responses to CXCL12 in cells expressing both CXCR4 and CXCR7. These results advance understanding of normal and pathologic functions of CXCL12, which is critical for developing effective strategies to target these pathways therapeutically.

Dataset Information

Crystal Structure of ?-Arrestin 2 in Complex with CXCR7 Phosphopeptide.

Publications

Crystal Structure of β-Arrestin 2 in Complex with CXCR7 Phosphopeptide.

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