Plasmenylcholine and Phosphatidylcholine Membrane Bilayers Possess Distinct Conformational Motifs

Xianlin Han, Richard W. Gross

Research output: Contribution to journalArticle

92 Scopus citations

Abstract

The conformation of plasmenylcholine near the hydrophobic-hydrophilic interface in membrane bilayers was deduced by determination of critical internuclear distances utilizing truncated driven nuclear Overhauser enhancement. These experiments demonstrated that the β-vinyl ether proton in plasmenylcholine was in close spatial proximity and nearly equidistant (~3 Å) to both the α- and β-methylene protons of the sn-2 aliphatic chain. In contrast, the distances between the α-vinyl ether proton and the α- and β-methylene protons of the sn-2 aliphatic chain were ≥5 Å. Furthermore, the distance between the N-CH3 protons in the polar head group and the methylene protons of the glycerol backbone in plasmenylcholine vesicles is larger than that present in phosphatidylcholine vesicles. Although the proximal portion of the sn-2 acyl chain in phosphatidylcholine is bent, conformational analysis utilizing these distance constraints demonstrated that the carbon atoms which comprise the proximal portion of the sn-2 aliphatic chain in plasmenylcholine are nearly coplanar, in register, and parallel to the sn-1 aliphatic chain. Taken together, these observations indicate that modest covalent alterations in the proximal portion of the sn-1 aliphatic chain in choline glycerophospholipids result in substantial changes in the molecular conformation and packing of hydrated phospholipid bilayers.

Original languageEnglish (US)
Pages (from-to)4992-4996
Number of pages5
JournalBiochemistry
Volume29
Issue number20
DOIs
StatePublished - May 1 1990
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry

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