Why the study?
Different isoforms of TnI and TnC are expressed in the flight and jump muscles of Locusta migratoria, but how these distinct troponin complexes regulate thin filaments was unclear.
Locust flight muscle troponin partially activates thin filaments in a calcium-dependent manner due to a specific residue in TnC1, suggesting additional regulatory mechanisms are required for full activation.
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Identifies Leu60 as modulator of partial Ca2+ activation in insect TnC1; leaves open relevance to vertebrate cardiac thin-filament regulation.
Liang et al. (2022) studied this question.
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