Phosphatidylinositol 4,5-bisphosphate alters synaptotagmin 1 membrane docking and drives opposing bilayers closer together.

Abstract:

:Synaptotagmin 1 (syt1) is a synaptic vesicle-anchored membrane protein that acts as the calcium sensor for the synchronous component of neuronal exocytosis. Using site-directed spin labeling, the position and membrane interactions of a fragment of syt1 containing its two C2 domains (syt1C2AB) were assessed in bilayers containing phosphatidylcholine (PC), phosphatidylserine (PS), and phosphatidylinositol 4,5-bisphosphate (PIP(2)). Addition of 1 mol % PIP(2) to a lipid mixture of PC and PS results in a deeper membrane penetration of the C2A domain and alters the orientation of the C2B domain so that the polybasic face of C2B comes into the proximity of the bilayer interface. The C2B domain is found to contact the membrane interface in two regions, the Ca(2+)-binding loops and a region opposite the Ca(2+)-binding loops. This suggests that syt1C2AB is configured to bridge two bilayers and is consistent with a model generated previously for syt1C2AB bound to membranes of PC and PS. Point-to-plane depth restraints, obtained by progressive power saturation, and interdomain distance restraints, obtained by double electron-electron resonance, were obtained in the presence of PIP(2) and used in a simulated annealing routine to dock syt1C2AB to two membrane interfaces. The results yield an average structure different from what is found in the absence of PIP(2) and indicate that bilayer-bilayer spacing is decreased in the presence of PIP(2). The results indicate that PIP(2), which is necessary for bilayer fusion, alters C2 domain orientation, enhances syt1-membrane electrostatic interactions, and acts to drive vesicle and cytoplasmic membrane surfaces closer together.

journal_name

Biochemistry

journal_title

Biochemistry

authors

Kuo W,Herrick DZ,Cafiso DS

doi

10.1021/bi200049c

subject

Has Abstract

pub_date

2011-04-05 00:00:00

pages

2633-41

issue

13

eissn

0006-2960

issn

1520-4995

journal_volume

50

pub_type

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