Calcium-dependent switching of the specificity of phosphoinositide binding to synaptotagmin.

Abstract:

:The synaptic vesicle membrane protein synaptotagmin (tagmin) is essential for fast, calcium-dependent, neurotransmitter release and is likely to be the calcium sensor for exocytosis, because of its many calcium-dependent properties. Polyphosphoinositides are needed for exocytosis, but it has not been known why. We now provide a possible connection between these observations with the finding that the C2B domain of tagmin I binds phosphatidylinositol-4,5-bisphosphate (PIns-4,5-P2), its isomer phosphatidylinositol-3,4-bisphosphate and phosphatidylinositol-3,4,5-trisphosphate (PIns-3,4,5-P3). Calcium ions switch the specificity of this binding from PIns-3,4,5-P3 (at calcium concentrations found in resting nerve terminals) to PIns-4,5-P2 (at concentration of calcium required for transmitter release). Inositol polyphosphates, known blockers of neurotransmitter release, inhibit the binding of both PIns-4,5-P2 and PIns-3,4,5-P3 to tagmin. Our findings imply that tagmin may operate as a bimodal calcium sensor, switching bound lipids during exocytosis. This connection to polyphosphoinositides, compounds whose levels are physiologically regulated, could be important for long-term memory and learning.

authors

Schiavo G,Gu QM,Prestwich GD,Söllner TH,Rothman JE

doi

10.1073/pnas.93.23.13327

subject

Has Abstract

pub_date

1996-11-12 00:00:00

pages

13327-32

issue

23

eissn

0027-8424

issn

1091-6490

journal_volume

93

pub_type

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