Key result
The T2p-alpha fragment of troponin T bound more strongly to TnC and Tm than T2p-beta, and exhibited 3-fold higher Ca2+ affinities at the regulatory sites of TnC.
Population
Rabbit skeletal TnT cDNA clones overexpressed in Escherichia coli to produce T2p-alpha and T2p-beta fragments
Comparison
T2p-alpha fragment vs T2p-beta fragment
Design
Preclinical
Authors
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Troponin T isoform differences may modulate Ca2+ sensitivity; leaves open relevance to human cardiac disease.
Effect estimate: 3-fold higher
The alpha and beta isoforms of troponin T exhibit functional differences in binding affinities to TnC and tropomyosin, potentially contributing to the Ca2+ sensitivity of muscle fibers.
Pan et al. (1992) studied this question. T2p-alpha vs. T2p-beta was evaluated on Binding affinity to TnC and Tm, and Ca2+ affinities (3-fold higher). The T2p-alpha fragment of troponin T bound more strongly to TnC and Tm than T2p-beta, and exhibited 3-fold higher Ca2+ affinities at the regulatory sites of TnC.
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