Key result
Combined NMR and calorimetry reveal the structural and thermodynamic impact of a troponin activator.
Why the study?
Troponin modulators binding allosterically with calcium have potential to improve contractility in reduced cardiac function, but rational design approaches beyond traditional structural methods are needed.
Provides a structural and thermodynamic rationale for the rational design of cardiac troponin activators to potentially improve contractility in heart failure.
May enable troponin-targeted inotrope development; leaves open clinical efficacy and safety in HF.
Cardiac troponin is a regulatory protein complex located on the sarcomere that regulates the engagement of myosin on actin filaments. Low-molecular weight modulators of troponin that bind allosterically with the calcium ion have the potential to improve cardiac contractility in patients with reduced cardiac function. Here we propose an approach to the rational design of troponin modulators through the combined use of solution nuclear magnetic resonance and isothermal titration calorimetry methods. In contrast to traditional approaches limited to calcium and activator-bound troponin structures, here we analyzed the structural and thermodynamic impact of an activator in the context of the troponin functional cycle. This led us to propose a rationale for developing an efficacious troponin activator.
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Poppe et al. (2022) studied this question. Low-molecular weight modulators of troponin was evaluated. A combined approach using solution nuclear magnetic resonance and isothermal titration calorimetry elucidated the structural and thermodynamic impact of an activator on the troponin functional cycle.
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