S-Nitrosylation of β-Arrestins Biases Receptor Signaling and Confers Ligand Independence.
Most G protein-coupled receptors (GPCRs) signal through both heterotrimeric G proteins and β-arrestins (βarr1 and βarr2). Although synthetic ligands can elicit biased signaling by G protein- vis-à-vis βarr-mediated transduction, endogenous mechanisms for biasing signaling remain elusive. Here we report that S-nitrosylation of a novel site within βarr1/2 provides a general mechanism to bias ligand-induced signaling through GPCRs by selectively inhibiting βarr-mediated transduction. Concomitantly, S-nitrosylation endows cytosolic βarrs with receptor-independent function. Enhanced βarr S-nitrosylation characterizes inflammation and aging as well as human and murine heart failure. In genetically engineered mice lacking βarr2-Cys253 S-nitrosylation, heart failure is exacerbated in association with greatly compromised β-adrenergic chronotropy and inotropy, reflecting βarr-biased transduction and β-adrenergic receptor downregulation. Thus, S-nitrosylation regulates βarr function and, thereby, biases transduction through GPCRs, demonstrating a novel role for nitric oxide in cellular signaling with potentially broad implications for patho/physiological GPCR function, including a previously unrecognized role in heart failure.
Duke Scholars
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- beta-Arrestins
- Signal Transduction
- Receptors, G-Protein-Coupled
- RAW 264.7 Cells
- Nitric Oxide
- Middle Aged
- Mice, Inbred C57BL
- Mice
- Male
- Ligands
Citation
Published In
DOI
EISSN
Publication Date
Volume
Issue
Start / End Page
Location
Related Subject Headings
- beta-Arrestins
- Signal Transduction
- Receptors, G-Protein-Coupled
- RAW 264.7 Cells
- Nitric Oxide
- Middle Aged
- Mice, Inbred C57BL
- Mice
- Male
- Ligands