Identification of dynamin 2, an isoform ubiquitously expressed in rat tissues

Tiffany A. Cook, Raul Urrutia, Mark A. McNiven

Research output: Contribution to journalArticle

153 Scopus citations

Abstract

Dynamin is a 100-kDa microtubule-activated GTPase originally isolated from mammalian brain that has been proposed to be crucial in the early steps of endocytosis. Previous studies on the primary structure, biochemical properties, and functional role of dynamin indicated that it was neuron- specific. However, using an antibody against a synthetic peptide representing an enzymatic region of rat brain dynamin (D100), we identified a 100-kDa protein doublet in rat liver, suggesting that dynamin exists as different isoforms that are distinct from the brain counterpart. We then initiated a search for distinctive dynamin isoforms with antibodies and cDNA probes. A 500-bp PCR-generated cDNA probe corresponding to the enzymatic region of the rat brain dynamin-encoding gene was used to isolate six overlapping clones from a rat liver cDNA library that together span the complete coding sequence of another dynamin gene, 'Dyn2.' Sequence analyses reveal that dynamin 2 (Dyn2) is 75% identical to brain dynamin at the DNA level and is 79% identical at the protein level. By Northern blot analysis and isoform- specific PCR, Dyn2 was found ubiquitously in adult rat tissues as two transcripts of 3.5 kb and 4 kb; the highest levels were found in testis. These results indicate that dynamin proteins are encoded by at least two genes expressed differentially in mammalian tissues and that the expression of Dyn2, and not of brain dynamin, accounts for the ubiquitous distribution of dynamin in rat tissues.

Original languageEnglish (US)
Pages (from-to)644-648
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Volume91
Issue number2
DOIs
StatePublished - Jan 18 1994

Keywords

  • endocytosis
  • liver
  • molecular cloning
  • vesicular transport

ASJC Scopus subject areas

  • General

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