ATP-dependent inositide phosphorylation required for Ca(2+)-activated secretion.

Abstract:

:Regulated fusion of secretory granules with the plasma membrane in secretory cells requires ATP, Ca2+ and cytosolic as well as membrane proteins. ATP-dependent steps in Ca(2+)-activated secretion from PC12 cells require three cytosolic PEP proteins (priming in exocytosis proteins, PEP1-3), the identity of which will provide insights into the required ATP-using reactions. PEP3 was recently identified as phosphatidylinositol transfer protein (PtdInsTP), and here we report that PEP1 consists of the type I phosphatidylinositol-4-phosphate 5-kinase (PtdInsP5K). The roles of PEP3/PtdInsTP and PEP1/PtdInsP5K in sequential phosphoinositide recruitment and phosphorylation explains their synergistic activity in ATP-dependent priming. Moreover, inhibition of Ca(2+)-activated secretion by PtdIns(4,5)P2-specific antibodies and phospholipase C implies that 5-phosphorylated inositides play a novel, necessary role in the regulated secretory pathway. The results indicate that lipid kinase-mediated phosphorylation is an important basis for ATP use in the exocytotic pathway.

journal_name

Nature

journal_title

Nature

authors

Hay JC,Fisette PL,Jenkins GH,Fukami K,Takenawa T,Anderson RA,Martin TF

doi

10.1038/374173a0

subject

Has Abstract

pub_date

1995-03-09 00:00:00

pages

173-7

issue

6518

eissn

0028-0836

issn

1476-4687

journal_volume

374

pub_type

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