Document Detail

Asymmetric distribution of phosphatidylethanolamine fatty acyl chains in the membrane of vesicular stomatitis virus.
MedLine Citation:
PMID:  208607     Owner:  NLM     Status:  MEDLINE    
The membrane of vesicular stomatitis virus (VSV) contains two distinct pools of phosphatidylethanolamine molecules which reside in the inner and outer phospholipid monolayers, respectively. 36% of the total membrane phosphatidylethanolamine is found in the outer monolayer while 64% is found in the inner. The two pools of VSV phosphatidylethanolamine can be distinguished operationally by the fact that only outer phosphatidylethanolamine is reactive in intact virions with the membrane-impermeable reagent trinitrobenzenesulfonate (TNBS). We have made use of this property to separate inner from outer VSV phosphatidylethanolamine and to determine the fatty acyl chain compositions of the two phosphatidylethanolamine pools separately. The results show that compared to outer phosphatidylethanolamine, inner phosphatidylethanolamine molecules contain a significantly higher proportion of unsaturated fatty acyl chains. Furthermore, whereas the proportion of unsaturated fatty acyl chains was found to be quite similar at the 1 and 2 glycerol carbon atoms in inner phosphatidylethanolamine, a marked dissimilarity was observed in outer phosphatidylethanolamine; outer phosphatidylethanolamine was enriched in saturated fatty acyl chains at the 1 position and in unsaturated fatty acyl chains at the 2 position. The differential fatty acyl chain composition of inner compared to outer phosphatidylethanolamine indicates that rapid, random transmembrane migration (flip-flop) of phosphatidylethanolamine does not occur in the VSV membrane. The nature of the fatty acyl chain asymmetry observed in VSV phosphatidylethanolamine does not support the view that the identity of the fatty acyl chains can uniquely specify or determine which side of the membrane individual phosphatidylethanolamine molecules come to occupy. Although fatty acyl chain asymmetry and phosphatidylethanolamine asymmetry are correlated in VSV, no simple rules can be discerned which uniquely relate the two paramaters.
B S Fong; J C Brown
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Biochimica et biophysica acta     Volume:  510     ISSN:  0006-3002     ISO Abbreviation:  Biochim. Biophys. Acta     Publication Date:  1978 Jul 
Date Detail:
Created Date:  1978-09-15     Completed Date:  1978-09-15     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0217513     Medline TA:  Biochim Biophys Acta     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  230-41     Citation Subset:  IM    
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MeSH Terms
Chemical Phenomena
Fatty Acids / analysis,  metabolism*
Fatty Acids, Unsaturated / metabolism
Membrane Lipids / metabolism*
Phosphatidylethanolamines / analysis,  metabolism*
Trinitrobenzenesulfonic Acid
Vesicular stomatitis Indiana virus / metabolism*
Reg. No./Substance:
0/Fatty Acids; 0/Fatty Acids, Unsaturated; 0/Membrane Lipids; 0/Phosphatidylethanolamines; 2508-19-2/Trinitrobenzenesulfonic Acid

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