Abstract
Tropomyosin (Tpm) is one of the most important partners of actin filament that largely determines its properties. In animal organisms, there are different isoforms of Tpm, which are believed to be involved in the regulation of various cellular functions. However, molecular mechanisms by which various Tpm cytoplasmic regulate of the functioning of actin filaments are still poorly understood. Here, we investigated the properties of Tpm2.1 and Tpm4.1 isoforms and compared them to each other and to more extensively studied Tpm isoforms. Tpm2.1 and Tpm4.1 were very similar in their affinity to F-actin, thermal stability, and resistance to limited proteolysis by trypsin, but differed markedly in the viscosity of their solutions and thermal stability of their complexes with F-actin. The main difference of Tpm2.1 and Tpm4.1 from other Tpm isoforms (e.g., Tpm1.6 and Tpm1.7) was their extremely low thermal stability as measured by the CD and DSC methods. We suggested the possible causes of this instability based on comparing the amino acid sequences of Tpm4.1 and Tpm2.1 with the sequences of Tpm1.6 and Tpm1.7 isoforms, respectively, that have similar exon structure.
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Abbreviations
- DSC:
-
differential scanning calorimetry
- F-actin:
-
fibrillar actin
- Tpm:
-
tropomyosin
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This work was supported by the Russian Science Foundation, grant no. 22-74-10106.
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A.M.M. developed the study concept and provided project management; A.S.L., D.S.Y., and V.V.N. obtained Tpm preparations and performed experiments; S.Y.K. performed DSC measurements; A.M.M. and D.I.L. write the original draft. All authors took part in the discussion of the results and editing of the final version of the article.
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Logvinov, A.S., Nefedova, V.V., Yampolskaya, D.S. et al. Structural and Functional Properties of Tropomyosin Isoforms Tpm4.1 and Tpm2.1. Biochemistry Moscow 88, 801–809 (2023). https://doi.org/10.1134/S0006297923060081
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DOI: https://doi.org/10.1134/S0006297923060081