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ATP Synthase: Mechanism

ATP Synthase: Mechanism

In animals, the mitochondrial F1F0 ATP synthase is the key protein that synthesizes ATP molecules through a complex catalytic mechanism. While the nuclear genome encodes the majority of ATP synthase subunits, the mitochondrial genome encodes some of the enzyme's most critical components. The formation of this multi-subunit enzyme is a complex multi-step process regulated at the level of transcription, translation, and assembly. Defects in one or more of these steps can result in decreased...

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Cys340Ser Mutation Abolishing S-Nitrosylation Drives GRK2 Mitochondrial Localization and Dysfunction.

Gizem Kayki Mutlu¹, Stephanie M Kereliuk², Maya Hoteit²

¹Department of Pharmacology, Faculty of Pharmacy, Ankara University, Tandogan, 06100 Ankara, Turkey.

|March 14, 2026

Summary

S-nitrosylation normally limits G protein-coupled receptor kinase 2 (GRK2) in mitochondria. Inhibiting this modification worsens cardiac mitochondrial function and dynamics, highlighting GRK2 regulation as a therapeutic target.

Keywords:

GRK2 S-nitrosylation hypoxia/reoxygenation mitochondria

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Area of Science:

Cardiovascular Biology
Mitochondrial Medicine
Molecular Cardiology

Background:

G protein-coupled receptor kinase 2 (GRK2) is upregulated in cardiac pathologies.
GRK2 contributes to cardiac dysfunction through both receptor-mediated and mitochondrial effects.
S-nitrosylation of GRK2 at Cysteine 340 acts as an endogenous brake on its activity.

Purpose of the Study:

To investigate the role of S-nitrosylation in regulating GRK2's mitochondrial localization and function.
To examine GRK2's impact on mitochondrial dynamics and mitophagy under hypoxia/reoxygenation stress.

Main Methods:

Utilized AC16 cardiac cells infected with adenoviruses expressing a GRK2 C340S mutation to block S-nitrosylation.
Assessed mitochondrial function via oxygen consumption rates and ATP production.
Analyzed mitochondrial dynamics and mitophagy.

Main Results:

Inhibition of S-nitrosylation significantly enhanced GRK2's mitochondrial localization, particularly under pathological conditions.
Mitochondrial function, including oxygen consumption and ATP production, was impaired when S-nitrosylation was blocked.
GRK2 without S-nitrosylation led to adverse outcomes due to altered mitochondrial dynamics and mitophagy.

Conclusions:

S-nitrosylation is crucial for regulating GRK2's mitochondrial function and localization in cardiac cells.
Disrupting GRK2 S-nitrosylation exacerbates mitochondrial dysfunction and adverse cardiac outcomes.
Targeting GRK2 post-translational modifications, like S-nitrosylation, presents a potential therapeutic strategy for cardiac pathologies.