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KBTBD13 is an actin-binding protein that modulates muscle kinetics

  • Josine M. de Winter
  • , Joery P. Molenaar
  • , Michaela Yuen
  • , Robbert van der Pijl
  • , Shengyi Shen
  • , Stefan Conijn
  • , Martijn van de Locht
  • , Menne Willigenburg
  • , Sylvia Jp Bogaards
  • , Esmee Sb van Kleef
  • , Saskia Lassche
  • , Malin Persson
  • , Dilson E. Rassier
  • , Tamar E. Sztal
  • , Avnika A. Ruparelia
  • , Viola Oorschot
  • , Georg Ramm
  • , Thomas E. Hall
  • , Zherui Xiong
  • , Christopher N. Johnson
  • Frank Li, Balazs Kiss, Noelia Lozano-Vidal, Reinier A. Boon, Manuela Marabita, Leonardo Nogara, Bert Blaauw, Richard J. Rodenburg, Benno Küsters, Jonne Doorduin, Alan H. Beggs, Henk Granzier, Ken Campbell, Weikang Ma, Thomas Irving, Edoardo Malfatti, Norma B. Romero, Robert J. Bryson-Richardson, Baziel Gm van Engelen, Nicol C. Voermans, Coen Ac Ottenheijm
  • Department of Neurology, Rijnstate Hospital, Arnhem, The Netherlands.
  • Discipline of Paediatrics and Child Health, Faculty of Medicine, University of Sydney, Australia.
  • Department of Cellular and Molecular Medicine, University of Arizona, Tucson, AZ, USA.
  • Department of Obstetrics and Gynecology, VU University Medical Center, Amsterdam, The Netherlands; Department of Physiology, VU University Medical Center, Amsterdam, The Netherlands.
  • Department of Neurology, Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center, Nijmegen, The Netherlands.
  • Department of Physiology and Pharmacology, Section of Anesthesiology and Intensive Care Medicine, Karolinska Institutet, 171 77, Stockholm, Sweden.
  • Department of Kinesiology and Physical Education, McGill University, Montreal, Canada.
  • School of Biological Sciences, Monash University, Melbourne, Australia.
  • Monash Ramaciotti Centre for Structural Cryo-Electron Microscopy, Monash University, Melbourne, Australia.
  • Biochemistry and Molecular Biology, Monash Biomedicine Discovery Institute, Monash University, Melbourne, Victoria, Australia.
  • Queensland Brain Institute, The University of Queensland, Brisbane, QLD 4072, Australia; Institute for Molecular Bioscience, The University of Queensland, Brisbane, QLD 4072, Australia.
  • Division of Clinical Pharmacology, Center for Arrhythmia Research and Therapeutics and Center for Structural Biology, Vanderbilt University Medical Center, Nashville, Tennessee, USA.
  • Venetian Institute of Molecular Medicine, Department of Biomedical Sciences, University of Padova, Italy.
  • Department of Pediatrics, Radboud University Medical Centre, Translational Metabolic Laboratory, Nijmegen, Netherlands.
  • Department of Pathology, Radboud University Medical Centre, Geert Grooteplein Zuid 10, 6525 GA, Nijmegen, The Netherlands.
  • Division of Genetics and Genomics, The Manton Center for Orphan Disease Research, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts, USA.
  • Department of Physiology and Division of Cardiovascular Medicine, University of Kentucky, Lexington, Kentucky, USA.
  • BioCAT, Illinois Institute of Technology, Chicago, Illinois, USA.
  • Service Neurologie Médicale, Centre de Référence Maladies Neuromusculaire Paris-Nord CHU Raymond-Poincaré, U1179 UVSQ-INSERM Handicap Neuromusculaire: Physiologie, Biothérapie et Pharmacologie Appliquées, UFR des Sciences de la Santé Simone Veil, Université Versailles-Saint-Quentin-en-Yvelines, Garches, France.
  • Centre de Référence de Pathologie Neuromusculaire Paris-Est, GHU Pitié-Salpêtrière, Assistance Publique-Hôpitaux de Paris, Paris, France.

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Abstract

The mechanisms that modulate the kinetics of muscle relaxation are critically important for muscle function. A prime example of the impact of impaired relaxation kinetics is nemaline myopathy caused by mutations in KBTBD13 (NEM6). In addition to weakness, NEM6 patients have slow muscle relaxation, compromising contractility and daily life activities. The role of KBTBD13 in muscle is unknown, and the pathomechanism underlying NEM6 is undetermined. A combination of transcranial magnetic stimulation-induced muscle relaxation, muscle fiber- and sarcomere-contractility assays, low-angle x-ray diffraction, and superresolution microscopy revealed that the impaired muscle-relaxation kinetics in NEM6 patients are caused by structural changes in the thin filament, a sarcomeric microstructure. Using homology modeling and binding and contractility assays with recombinant KBTBD13, Kbtbd13-knockout and Kbtbd13R408C-knockin mouse models, and a GFP-labeled Kbtbd13-transgenic zebrafish model, we discovered that KBTBD13 binds to actin - a major constituent of the thin filament - and that mutations in KBTBD13 cause structural changes impairing muscle-relaxation kinetics. We propose that this actin-based impaired relaxation is central to NEM6 pathology.
Original languageEnglish
Pages (from-to)754-767
Number of pages14
JournalJournal of clinical investigation
Volume130
Issue number2
DOIs
Publication statusPublished - 3 Feb 2020

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