Abstract：
:The molecular dynamics of binary dispersions of plasmenylcholine/cholesterol and phosphatidylcholine/cholesterol were quantified by electron spin resonance (ESR) and deuterium magnetic resonance (2H NMR) spectroscopy. The order parameter of both 5-doxylstearate (5DS) and 16-doxylstearate (16DS) was larger in vesicles comprised of plasmenylcholine in comparison to phosphatidylcholine at all temperatures studied (e.g., S = 0.592 vs. 0.487 for 5DS and 0.107 vs. 0.099 for 16DS, respectively, at 38 degrees C). Similarly, the order parameter of plasmenylcholine vesicles was larger than that of phosphatidylcholine vesicles utilizing either spin-labeled phosphatidylcholine or spin-labeled plasmenylcholine as probes of molecular motion. The ratio of the low-field to the midfield peak height in ESR spectra of 16-doxylstearate containing moieties (i.e., spin-labeled plasmenylcholine and phosphatidylcholine) was lower in plasmenylcholine vesicles (0.93 +/- 0.01) in comparison to phosphatidylcholine vesicles (1.03 +/- 0.01). 2H NMR spectroscopy demonstrated that the order parameter of plasmenylcholine was greater than that of phosphatidylcholine for one of the two diastereotopic deuterons located at the C-2 carbon of the sn-2 fatty acyl chain. The spin-lattice relaxation times for deuterated plasmenylcholine and phosphatidylcholine in binary mixtures containing 0-50 mol % cholesterol varied nonmonotonically as a function of cholesterol concentration and were different for each phospholipid subclass. Taken together, the results indicate that the vinyl ether linkage in the proximal portion of the sn-1 aliphatic chain of plasmenylcholine has substantial effects on the molecular dynamics of membrane bilayers both locally and at sites spatially distant from the covalent alteration.
journal_name
Biochemistryjournal_title
Biochemistryauthors
Pak JH,Bork VP,Norberg RE,Creer MH,Wolf RA,Gross RWdoi
10.1021/bi00389a033subject
Has Abstractpub_date
1987-07-28 00:00:00pages
4824-30issue
15eissn
0006-2960issn
1520-4995journal_volume
26pub_type
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