Polyunsaturated phosphatidylinositol and diacylglycerol substantially modify the fluidity and polymorphism of biomembranes: a solid-state deuterium NMR study.

Abstract:

:One of the main biological systems that can be used as a model for studying the molecular mechanisms involved in membrane fusion is the formation of the nuclear envelope (NE). NE assembly to form the male pronucleus at fertilization occurs by binding of NE membrane precursor vesicles to chromatin and their fusion. MV1 is an NE precursor vesicle population of low density, highly enriched in [18:0/20:4]PI. The modification of [18:0/20:4]PI to [18:0/20:4]DAG leads to NE formation, and the depletion of MV1 from the total membrane precursors results in the inhibition of NE assembly. Here we show by 2H NMR studies of various physiologically relevant model membranes made of [18:0/20:4]PI, [18:0/20:4]DAG, and saturated and unsaturated PC that membranes of composition similar to MV1 exhibit dramatically enhanced fluidity and non-lamellar structures, thus providing a possible explanation for the essential role of MV1 and the modification of PI to DAG in membrane precursor vesicles during NE assembly.

journal_name

Lipids

journal_title

Lipids

authors

Larijani B,Dufourc EJ

doi

10.1007/s11745-006-5045-2

subject

Has Abstract

pub_date

2006-10-01 00:00:00

pages

925-32

issue

10

eissn

0024-4201

issn

1558-9307

journal_volume

41

pub_type

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