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pubmed-article:14507703pubmed:abstractTextIn the mixture of lipids and proteins which comprise pulmonary surfactant, the dominant protein by mass is surfactant protein A (SP-A), a hydrophilic glycoprotein. SP-A forms octadecamers that interact with phospholipid bilayer surfaces in the presence of calcium. Deuterium NMR was used to characterize the perturbation by SP-A, in the presence of 5 mM Ca(2+), of dipalmitoyl phosphatidylcholine (DPPC) properties in DPPC/egg-PG (7:3) bilayers. Effects of SP-A were uniformly distributed over the observed DPPC population. SP-A reduced DPPC chain orientational order significantly in the gel phase but only slightly in the liquid-crystalline phase. Quadrupole echo decay times for DPPC chain deuterons were sensitive to SP-A in the liquid-crystalline mixture but not in the gel phase. SP-A reduced quadrupole splittings of DPPC choline beta-deuterons but had little effect on choline alpha-deuteron splittings. The observed effects of SP-A on DPPC/egg-PG bilayer properties differ from those of the hydrophobic surfactant proteins SP-B and SP-C. This is consistent with the expectation that SP-A interacts primarily at bilayer surfaces.lld:pubmed
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pubmed-article:14507703pubmed:authorpubmed-author:MorrowMichael...lld:pubmed
pubmed-article:14507703pubmed:authorpubmed-author:KeoughKevin...lld:pubmed
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pubmed-article:14507703pubmed:dateRevised2009-11-18lld:pubmed
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pubmed-article:14507703pubmed:articleTitleInteraction of pulmonary surfactant protein SP-A with DPPC/egg-PG bilayers.lld:pubmed
pubmed-article:14507703pubmed:affiliationDepartment of Physics and Physical Oceanography, Memorial University of Newfoundland, St. John's, Newfoundland, A1B 3X9 Canada. myke@physics.mun.calld:pubmed
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pubmed-article:14507703pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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