Calmodulin Regulates Endosome Fusion*

Calmodulin (CaM) has previously been implicated in regulated exocytosis, transcytosis, and receptor recycling. We have investigated the role of CaM in endocytic transport by examining the effects of several CaM antagonists in intact cells. We present evidence indicating that the mixing of sequentially internalized ligands is inhibited by CaM antagonists, indicating that CaM may play a general role in regulating endosomal membrane trafficking. To address the specific events that are affected by CaM we studied its role in an in vitro assay that reconstitutes fusion among endosomes. CaM antagonists inhibited endosome fusion, and the inhibition was reversed by the addition of CaM. Moreover, we found that Ca2+ stimulates fusion among endosomes and that addition of CaM stimulates fusion beyond that produced by Ca2+ alone. Our data indicate that one of the possible targets for CaM in endosome fusion is the CaM-dependent kinase II. We propose that CaM regulates endocytic transport by modulating an essential component(s) of the membrane traffic machinery.

• Publication year

  1997

• Venue

  Journal of Biological Chemistry

• Publication date

  1997-03-21

• Fields of study

  Biology, Medicine, Chemistry

• Identifiers
  DOI 10.1074/jbc.272.12.7707PMID 9065429
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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