Key result
The novel C. elegans tropomyosin isoform LEV-11U, containing alternative exon 7c, binds poorly to actin filaments with no measurable affinity, unlike LEV-11T which binds with a Kd of 3.7 μM.
Why the study?
Multiple tropomyosin isoforms are expressed in metazoans and regulate actin cytoskeleton subpopulations, but the functions of many tropomyosin isoforms remain unknown.
Alternative splicing of a single exon in C. elegans tropomyosin produces an isoform with poor actin affinity, suggesting a novel biological function.
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Novel tropomyosin exon in C. elegans extends isoform diversity knowledge; leaves open conservation and cardiac relevance in vertebrates.
Ono et al. (2023) studied this question. LEV-11U (tropomyosin isoform containing exon 7c) vs. LEV-11T (tropomyosin isoform containing exon 7b) was evaluated on F-actin binding affinity (Kd in μM). The novel C. elegans tropomyosin isoform LEV-11U, containing alternative exon 7c, binds poorly to actin filaments with no measurable affinity, unlike LEV-11T which binds with a Kd of 3.7 μM.
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