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Energetics of stalk intermediates in membrane fusion are controlled by lipid composition.

Abstract：

:We have used X-ray diffraction on the rhombohedral phospholipid phase to reconstruct stalk structures in different pure lipids and lipid mixtures with unprecedented resolution, enabling a quantitative analysis of geometry, as well as curvature and hydration energies. Electron density isosurfaces are used to study shape and curvature properties of the bent lipid monolayers. We observe that the stalk structure is highly universal in different lipid systems. The associated curvatures change in a subtle, but systematic fashion upon changes in lipid composition. In addition, we have studied the hydration interaction prior to the transition from the lamellar to the stalk phase. The results indicate that facilitating dehydration is the key to promote stalk formation, which becomes favorable at an approximately constant interbilayer separation of 9.0 ± 0.5 Å for the investigated lipid compositions.

journal_name

Proc Natl Acad Sci U S A

journal_title

Proceedings of the National Academy of Sciences of the United States of America

authors

Aeffner S,Reusch T,Weinhausen B,Salditt T

doi

10.1073/pnas.1119442109

subject

Has Abstract

pub_date

2012-06-19 00:00:00

pages

E1609-18

issue

25

eissn

0027-8424

issn

1091-6490

pii

1119442109

journal_volume

109

pub_type

杂志文章

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