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Related Experiment Videos

Structure and evolution of the actin crosslinking proteins.

R R Dubreuil1

  • 1Biological Laboratories, Harvard University, Cambridge, MA 02138.

Bioessays : News and Reviews in Molecular, Cellular and Developmental Biology
|May 1, 1991
PubMed
Summary

Actin crosslinking proteins show diverse structures due to evolutionary gene shuffling. A common actin-binding domain is shared among proteins like spectrin and dystrophin, explaining their related functions despite structural differences.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Evolutionary Biology

Background:

  • Actin crosslinking proteins are crucial for cell structure and function.
  • These proteins display significant diversity in size, shape, and mechanism of actin filament crosslinking.

Purpose of the Study:

  • To investigate the evolutionary origins of diversity among actin crosslinking proteins.
  • To identify common structural and functional elements contributing to actin binding.

Main Methods:

  • Amino acid sequence analysis of various actin crosslinking proteins.
  • Comparative analysis of homologous sequence segments.

Main Results:

  • A conserved homologous sequence segment, identified as the common actin-binding domain, is shared among spectrin, alpha-actinin, ABP-120, ABP-280, fimbrin, and dystrophin.

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  • The remaining protein structures are composed of shuffled and multiplied repetitive and non-repetitive sequence segments.

    • Conclusions:

    • Protein diversity arises from the evolutionary combination of a common actin-binding domain with variable structural elements.
    • This evolutionary mechanism explains the functional and compositional relationships, as well as the significant structural variations, observed in actin crosslinking proteins.