Cited by 145Glycosylation and Glycoproteins ResearchCardiomyopathy and Myosin StudiesRedox biology and oxidative stress

O -Linked GlcNAc Modification of Cardiac Myofilament Proteins: A Novel Regulator of Myocardial Contractile Function

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Ramirez-Correa, Genaro A., Jin, Wenhai, Wang, Zihao, Zhong, Xin, Gao, Wei Dong, Dias, Wagner B., Vecoli, Cecilia, Hart, Gerald W. +1 more·2008·Circulation Research

Abstract

In addition to O -phosphorylation, O -linked modifications of serine and threonine by β- N -acetyl- d -glucosamine (GlcNAc) may regulate muscle contractile function. This study assessed the potential role of O -GlcNAcylation in cardiac muscle contractile activation. To identify specific sites of O -GlcNAcylation in cardiac myofilament proteins, a recently developed methodology based on GalNAz-biotin labeling followed by dithiothreitol replacement and light chromatography/tandem mass spectrometry site mapping was adopted. Thirty-two O -GlcNAcylated peptides from cardiac myofilaments were identified on cardiac myosin heavy chain, actin, myosin light chains, and troponin I. To assess the potential physiological role of the GlcNAc, force–[Ca 2+ ] relationships were studied in skinned rat trabeculae. Exposure to GlcNAc significantly decreased calcium sensitivity (pCa50), whereas maximal force ( F max ) and Hill coefficient ( n ) were not modified. Using a pan-specific O -GlcNAc antibody, it was determined that acute exposure of myofilaments to GlcNAc induced a significant increase in actin O -GlcNAcylation. This study provides the first identification of O -GlcNAcylation sites in cardiac myofilament proteins and demonstrates their potential role in regulating myocardial contractile function.

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Authors
Ramirez-Correa, G. A., Jin, W., Wang, Z., Zhong, X., Gao, W. D., Dias, W. B., Vecoli, C., Hart, G. W., & Murphy, A. M.
Affiliations
  • From the Departments of Pediatrics (G.A.R.-C., W.J., A.M.M.) and Medicine (C.V.), Division of Cardiology; Departments of Biological Chemistry (Z.W., W.B.D., G.W.H.) and Anesthesia and Critical Care Medicine (X.Z., W.D.G.), Johns Hopkins University School of Medicine, Baltimore, Md; and Department of Pathophysiology (X.Z.), Harbin Medical University, People’s Republic of China.
  • Johns Hopkins University (US)
Venue
Circulation Research
Published
2008-12-05
Volume
103
Issue
12
Pages
1354-1358
ISSN
  • 0009-7330 (ISSN-L)
  • 1524-4571
OpenAlex
W2120416709
Cited by
145
References
25
Citations by year
2026: 5 · 2025: 6 · 2024: 12 · 2023: 7 · 2022: 7 · 2021: 8 · 2020: 15 · 2019: 4 · 2018: 12 · 2017: 3 · 2016: 12 · 2015: 7 · 2014: 13 · 2013: 5 · 2012: 14
FWCI
2.06
Type
journal article
Language
en
Open access
Locations
  • Circulation Research (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institutes of Health (n01hv28180-13-0-0)
  • National Heart, Lung, and Blood Institute (N01 HV-28180, R01HL063038, N01 HV028180, R01-HL-63038)
  • National Institute of Diabetes and Digestive and Kidney Diseases (R01DK061671, R01-DK61671)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Glycosylation and Glycoproteins Research
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiomyopathy and Myosin Studies
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Redox biology and oxidative stress
Keywords
O-GlcNAcylation, cardiac contractility, calcium sensitivity, myosin heavy chain, myosin light chain, troponin I, Hill coefficient
MeSH terms
Acetylglucosamine, Acylation, Animals, Carbohydrate Conformation, Mice, Inbred C57BL, Actin Cytoskeleton, Myocardial Contraction, Myocardium, Mice, Rats

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