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Specific role for the PH domain of dynamin‐1 in the regulation of rapid endocytosis in adrenal chromaffin cells

Specific role for the PH domain of dynamin‐1 in the regulation of rapid endocytosis in adrenal... Dynamin plays a key role in the scission event common to various types of endocytosis. We demonstrate that the pleckstrin homology (PH) domain of dynamin‐1 is critical in the process of rapid endocytosis (RE) in chromaffin cells. Introduction of this isolated PH domain into cells at concentrations as low as 1 μM completely suppressed RE. PH domains from other proteins, including that from the closely related dynamin‐2, were ineffective as inhibitors, even at high concentrations. Mutational studies indicated that a pair of isoform‐specific amino acids, located in a variable loop between the first two β‐strands, accounted for the differential effect of the two dynamin PH domains. Switching these amino acids in the dynamin‐2 PH domain to the equivalent residues in dynamin‐1 (SL→GI) generated a molecule that blocked RE. Thus, the PH domain of dynamin‐1 is essential for RE and exhibits a precise molecular selectivity. As chromaffin cells express both dynamin‐1 and ‐2, we speculate that different isoforms of dynamin may regulate distinct endocytotic processes and that the PH domain contributes to this specificity. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png The EMBO Journal Wiley

Specific role for the PH domain of dynamin‐1 in the regulation of rapid endocytosis in adrenal chromaffin cells

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References (76)

Publisher
Wiley
Copyright
Copyright © 2013 Wiley Periodicals, Inc
ISSN
0261-4189
eISSN
1460-2075
DOI
10.1093/emboj/16.7.1565
pmid
9130701
Publisher site
See Article on Publisher Site

Abstract

Dynamin plays a key role in the scission event common to various types of endocytosis. We demonstrate that the pleckstrin homology (PH) domain of dynamin‐1 is critical in the process of rapid endocytosis (RE) in chromaffin cells. Introduction of this isolated PH domain into cells at concentrations as low as 1 μM completely suppressed RE. PH domains from other proteins, including that from the closely related dynamin‐2, were ineffective as inhibitors, even at high concentrations. Mutational studies indicated that a pair of isoform‐specific amino acids, located in a variable loop between the first two β‐strands, accounted for the differential effect of the two dynamin PH domains. Switching these amino acids in the dynamin‐2 PH domain to the equivalent residues in dynamin‐1 (SL→GI) generated a molecule that blocked RE. Thus, the PH domain of dynamin‐1 is essential for RE and exhibits a precise molecular selectivity. As chromaffin cells express both dynamin‐1 and ‐2, we speculate that different isoforms of dynamin may regulate distinct endocytotic processes and that the PH domain contributes to this specificity.

Journal

The EMBO JournalWiley

Published: Jan 1, 1997

Keywords: ; ; ;

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