What question did this study set out to answer?

This research aims to investigate how pseudo-acetylation of specific actin residues affects contractile regulation in cardiac muscle.

January 10, 2026Journal of Molecular and Cellular Cardiology0 citationsOpen Access

Pseudo-acetylation of ACTC1 K326 and K328 promotes dysinhibition of reconstituted human cardiac thin filaments

Q: What does this research mean for the field?

Pseudo-acetylation of ACTC1 K326 and K328 reduces inhibition of myosin-driven motility in cardiac thin filaments at low calcium levels. Novelty: ClaimNovelty.NOVEL_FINDING. Consensus alignment: ConsensusAlignment.NEUTRAL.

KCKripa ChitreJohns Hopkins University OKOlga E. KarpichevaBoston University CKChloe J. KingUniversity of Guelph

Key Result

Pseudo-acetylation of ACTC1 K326 and K328 reduced inhibition of myosin-driven motility in cardiac thin filaments at low calcium levels.

Key Points

This research aims to investigate how pseudo-acetylation of specific actin residues affects contractile regulation in cardiac muscle.
Verification of acetylation on human cardiac actin (ACTC1)
Generation of recombinant K326/328Q acetylation mutants
Analysis of myosin-driven motility in thin filament assays
Pseudo-acetylation of K326/328 reduced myosin inhibition in F-actin-tropomyosin systems
Dysfunctional interaction at low calcium levels
Altered contractile dynamics observed in reconstituted cardiac thin filaments

Structured PICO

Population

Reconstituted human cardiac thin filaments (human cardiac actin ACTC1)

Intervention

Recombinant K326/328Q pseudo-acetylated ACTC1

Outcome

Inhibition of myosin-driven motility of F-actin-tropomyosin and F-actin-tropomyosin-troponin at low Casurrogate

Pseudo-acetylation of ACTC1 K326 and K328 disrupts thin filament-based contractile regulation by reducing inhibition of myosin-driven motility.

Main Result

Absolute Event Rate: 0% vs 0%

Abstract

Electrostatic interactions between actin residues K326 and K328 and tropomyosin bias tropomyosin to an F-actin location where it blocks myosin attachment. K326/328 acetylation neutralizes their charge, potentially disrupting thin filament-based contractile regulation. We verified acetylation of K326/328 on human cardiac actin (ACTC1) and generated recombinant K326/328Q, pseudo-acetylated ACTC1. Pseudo-acetylation reduced inhibition of myosin-driven motility of F-actin-tropomyosin and F-actin-tropomyosin-troponin at low Ca

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