Redundant and distinct functions for dynamin-1 and dynamin-2 isoforms

Yoram Altschuler, Shana M. Barbas, Laura J. Terlecky, Kitty Tang, Stephen Hardy, Keith E. Mostov, Sandra L. Schmid

Research output: Contribution to journalArticle

183 Scopus citations

Abstract

A role for dynamin in clathrin-mediated endocytosis is now well established. However, mammals express three closely related, tissue-specific dynamin isoforms, each with multiple splice variants. Thus, an important question is whether these isoforms and splice variants function in vesicle formation from distinct intracellular organelles. There are conflicting data as to a role for dynamin-2 in vesicle budding from the TGN. To resolve this issue, we compared the effects of overexpression of dominant-negative mutants of dynamin-1 (the neuronal isoform) and dynamin-2 (the ubiquitously expressed isoform) on endocytic and biosynthetic membrane trafficking in HeLa cells and polarized MDCK cells. Both dyn1(K44A) and dyn2(K44A) were potent inhibitors of receptor-mediated endocytosis; however neither mutant directly affected other membrane trafficking events, including transport mediated by four distinct classes of vesicles budding from the TGN. Dyn2(K44A) more potently inhibited receptor-mediated endocytosis than dyn1 (K44A) in HeLa cells and at the basolateral surface of MDCK cells. In contrast, dyn1(K44A) more potently inhibited endocytosis at the apical surface of MDCK cells. The two dynamin isoforms have redundant functions in endocytic vesicle formation, but can be targeted to and function differentially at subdomains of the plasma membrane.

Original languageEnglish (US)
Pages (from-to)1871-1881
Number of pages11
JournalJournal of Cell Biology
Volume143
Issue number7
DOIs
StatePublished - Dec 28 1998

Keywords

  • Adenovirus expression
  • Dynamin
  • Polarized MDCK cells
  • Receptor-mediated endocytosis
  • Trans-Golgi network

ASJC Scopus subject areas

  • Cell Biology

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    Altschuler, Y., Barbas, S. M., Terlecky, L. J., Tang, K., Hardy, S., Mostov, K. E., & Schmid, S. L. (1998). Redundant and distinct functions for dynamin-1 and dynamin-2 isoforms. Journal of Cell Biology, 143(7), 1871-1881. https://doi.org/10.1083/jcb.143.7.1871