Key result
Adjacent cardiac troponin I mutations alter conformation, with K118C uniquely reducing TnT binding affinity.
These findings elucidate how distinct adjacent pathogenic mutations in the TnI-TnT interface can cause cardiomyopathy through differential conformational and functional impacts.
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Distinct TnI mutation effects on TnT binding are hypothesis-generating in mice; human studies needed before clinical relevance.
Akhter et al. (2015) studied Cardiomyopathy. A117G and K118C mutations in cardiac troponin I vs. Wild-type cardiac troponin I was evaluated on Protein conformation and binding affinities for troponin T and troponin C. The adjacent A117G and K118C mutations in the TnT-interfacing helix of cardiac troponin I produced distinct conformational and functional changes, with K118C uniquely decreasing TnT binding affinity.
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