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Crystal structure of the dynamin tetramer.

Thomas F Reubold1, Katja Faelber2, Nuria Plattner3

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The mechanochemical protein dynamin

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Dynamin, a large GTPase, is crucial for membrane remodeling in cellular processes.
  • Dynamin tetramers oligomerize to constrict and sever clathrin-coated vesicles.
  • The molecular basis for dynamin assembly and regulation remains incompletely understood.

Purpose of the Study:

  • To elucidate the molecular determinants of dynamin assembly and regulation.
  • To present the high-resolution structure of the human dynamin tetramer.
  • To link dynamin structure and function to cellular processes and disease.

Main Methods:

  • X-ray crystallography of human dynamin tetramer (nucleotide-free state).
  • Mutational studies to assess protein function and interactions.
  • Oligomerization assays and Markov state models from molecular dynamics simulations.

Main Results:

  • The crystal structure of the human dynamin tetramer was determined.
  • A mechanism linking dynamin oligomerization to the release of autoinhibition was proposed.
  • Mutations affecting tetramer formation and autoinhibition are linked to neuromuscular disorders.

Conclusions:

  • The bent tetramer structure explains dynamin's helical assembly and membrane constriction role.
  • Understanding dynamin's molecular mechanisms provides insights into its cellular functions.
  • This study illuminates the structural basis of dynamin-related congenital muscle disorders.