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Article
Brooke M. Ahern, Andrea Sebastian, Bryana M. Levitan, Jensen Goh, Douglas A. Andres, Jonathan Satin
Ahern et al. show that the absence of Rad increases peak L-type calcium influx independently of β-adrenergic receptor signaling. This increased peak current is homeostatically balanced by channel inactivation, allowing enhanced contraction without action potential prolongation. The loss of Rad is a potential therapeutic target for safe positive inotropic support.
Article
Nicolae Moise, Heather L. Struckman, Celine Dagher, Rengasayee Veeraraghavan, Seth H. Weinberg
Moise et al. develop a finite element model of the intercalated disk (ID) that takes into account the nanoscale structure. Incorporating these details in a cardiac tissue model predicts that alterations in ID structure can affect electrical conduction in the heart.
Article
Maria Lopez-Redondo, Shujie Fan, Akiko Koide, Shohei Koide, Oliver Beckstein, David L. Stokes
Lopez-Redondo et al. use cryo-EM and molecular dynamics to evaluate the effects of Zn2+ binding on the conformation and dynamics of the zinc/proton antiporter YiiP. Removal of Zn2+ leads to enhanced conformational dynamics and causes a transition to an intermediate state in the transport cycle.
Article
Chang Zhao, Liang Hong, Jason D. Galpin, Saleh Riahi, Victoria T. Lim, Parker D. Webster, Douglas J. Tobias, Christopher A. Ahern, Francesco Tombola
Zhao et al. leverage the analysis of local conformational changes in a mutant Hv1 channel to inform the design of new inhibitors. These arginine mimics have improved interaction with the voltage-sensing domain and inhibit the wild-type channel with higher strength than guanidine derivatives.
Article
Chang Zhao, Liang Hong, Saleh Riahi, Victoria T. Lim, Douglas J. Tobias, Francesco Tombola
Zhao and colleagues use the Hv1 channel to study drugs that modulate channel activity by binding to the voltage-sensing domain (VSD). They describe a new compound that interacts with a known and a new site in distinct conformations and thus suggests new strategies to identify VSD-binding compounds.
Article
June-Chiew Han, Kenneth Tran, David J. Crossman, Claire L. Curl, Parisa Koutsifeli, Joshua P.H. Neale, Xun Li, Stephen B. Harrap, Andrew J. Taberner, Lea M.D. Delbridge, Denis S. Loiselle, Kimberley M. Mellor
Han et al. study the effect of primary cardiac hypertrophy on cardiac mechano-energetics. Using isolated cardiac tissues, they show that despite impaired contractile performance, cardiac mechanical efficiency is preserved in hypertrophic hearts.
Article
Robbert J. van der Pijl, Marloes van den Berg, Martijn van de Locht, Shengyi Shen, Sylvia J.P. Bogaards, Stefan Conijn, Paul Langlais, Pleuni E. Hooijman, Siegfried Labeit, Leo M.A. Heunks, Henk Granzier, Coen A.C. Ottenheijm
Passive force generated in titin plays an important role in maintaining sarcomere structure. In this paper, van der Pijl et al. describe a mechanism by which muscle ankyrin repeat protein 1 (MARP1) locks titin to the thin filament to increase passive force.

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Issue Cover
Current Issue
Volume 153,
Issue 7,
July 5, 2021
Reviews & Opinions
Research News
Ben Short
Single-channel recordings reveal that norfluoxetine inhibits the two-pore domain K+ channel TREK-2 by a complex array of mechanisms.
Editorial
Christine Cremo, Richard L. Moss, Henk Granzier
The July 2021 issue of JGP is a collection of peer-reviewed articles focused on the function and dynamic regulation of contractile systems in muscle and non-muscle cells.
Commentary
Anthony L. Hessel, Wolfgang A. Linke
The sarcomeric titin springs and accessory proteins modulate muscle force and mechanical signaling at the N2A signalosome.

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