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Perez I, Berndt S, Agarwal R, Castro MA, Vishnivetskiy SA, Smith JC, Sanders CR, Gurevich VV, Iverson T. A Model for the Signal Initiation Complex Between Arrestin-3 and the Src Family Kinase Fgr. J Mol Biol 2022; 434:167400. [PMID: 34902430 PMCID: PMC8752512 DOI: 10.1016/j.jmb.2021.167400] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2021] [Revised: 11/24/2021] [Accepted: 12/04/2021] [Indexed: 02/01/2023]
Abstract
Arrestins regulate a wide range of signaling events, most notably when bound to active G protein-coupled receptors (GPCRs). Among the known effectors recruited by GPCR-bound arrestins are Src family kinases, which regulate cellular growth and proliferation. Here, we focus on arrestin-3 interactions with Fgr kinase, a member of the Src family. Previous reports demonstrated that Fgr exhibits high constitutive activity, but can be further activated by both arrestin-dependent and arrestin-independent pathways. We report that arrestin-3 modulates Fgr activity with a hallmark bell-shaped concentration-dependence, consistent with a role as a signaling scaffold. We further demonstrate using NMR spectroscopy that a polyproline motif within arrestin-3 interacts directly with the SH3 domain of Fgr. To provide a framework for this interaction, we determined the crystal structure of the Fgr SH3 domain at 1.9 Å resolution and developed a model for the GPCR-arrestin-3-Fgr complex that is supported by mutagenesis. This model suggests that Fgr interacts with arrestin-3 at multiple sites and is consistent with the locations of disease-associated Fgr mutations. Collectively, these studies provide a structural framework for arrestin-dependent activation of Fgr.
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Affiliation(s)
- Ivette Perez
- Department of Biochemistry, Vanderbilt University, Nashville, TN 37232-0146;,Center for Structural Biology, Nashville, TN 37232-0146
| | - Sandra Berndt
- Department of Pharmacology, Vanderbilt University, Nashville, TN 37232-0146;,Center for Structural Biology, Nashville, TN 37232-0146
| | - Rupesh Agarwal
- Department of Biochemistry and Cellular and Molecular Biology, University of Tennessee, Knoxville, TN 37996;,UT/ORNL Center for Molecular Biophysics, Oak Ridge National Laboratory, TN
| | - Manuel A. Castro
- Department of Biochemistry, Vanderbilt University, Nashville, TN 37232-0146;,Center for Structural Biology, Nashville, TN 37232-0146
| | | | - Jeremy C. Smith
- Department of Biochemistry and Cellular and Molecular Biology, University of Tennessee, Knoxville, TN 37996;,UT/ORNL Center for Molecular Biophysics, Oak Ridge National Laboratory, TN
| | - Charles R. Sanders
- Department of Biochemistry, Vanderbilt University, Nashville, TN 37232-0146;,Center for Structural Biology, Nashville, TN 37232-0146
| | | | - T.M. Iverson
- Department of Biochemistry, Vanderbilt University, Nashville, TN 37232-0146;,Department of Pharmacology, Vanderbilt University, Nashville, TN 37232-0146;,Center for Structural Biology, Nashville, TN 37232-0146;,Vanderbilt Institute of Chemical Biology, Nashville, TN 37232-0146
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