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Perturbation of DPPC bilayers by high concentrations of pulmonary surfactant protein SP-B

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Abstract

Deuterium (2H) NMR has been used to observe perturbation of dipalmitoylphosphatidylcholine (DPPC) bilayers by the pulmonary surfactant protein B (SP-B) at concentrations up to 17% (w/w). Previous 2H NMR studies of DPPC/dipalmitoylphosphatidylglycerol (DPPG) (7:3) bilayers containing up to 11% (w/w) SP-B and DPPC bilayers containing up to 11% (w/w) synthetic SP-B indicated a slight effect on bilayer chain order and a more substantial effect on motions that contribute to decay of quadrupole echoes obtained from bilayers of deuterated DPPC. This is consistent with the perturbation of headgroup-deuterated DPPC reported here for bilayers containing 6 and 9% (w/w) SP-B. For the higher concentrations of SP-B investigated in the present work, 2H NMR spectra of DPPC deuterated in both the headgroup and chain display a prominent narrow component consistent with fast, large amplitude reorientation of some labeled lipid. Similar spectral perturbations have been reported for bilayers in the presence of the antibiotic polypeptide nisin. The observation of large amplitude lipid reorientation at high SP-B concentration could indicate that SP-B can induce regions of high bilayer curvature and thus provides some insight into local interaction of SP-B with DPPC. Such local interactions may be relevant to the formation, in vitro and in vivo, of tubular myelin, a unique structure found in extracellular pulmonary surfactant, and to the delivery of surfactant material to films at the air–water interface.

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Fig. 1a–d
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Fig. 3a, b
Fig. 4a, b

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Abbreviations

DPPC:

1,2-dipalmitoyl-sn-glycero-3-phosphocholine

DPPG:

1,2-dipalmitoyl-sn-glycero-3-phosphoglycerol

DPPC-d 62 :

1,2-perdeuterodipalmitoyl-sn-glycero-3-phosphocholine

DPPC-d 4 :

1,2-dipalmitoyl-sn-glycero-3-phospho-(α,β perdeutero)-choline

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Acknowledgements

K.W.M.K. is Chief Scientist, Health Canada, Ottawa, Ontario, Canada. This research was supported by grants from the Natural Science and Engineering Research Council of Canada to M.R.M. and from the Canadian Institutes of Health Research to K.M.W.K. The authors are grateful to Dr. Maria Kilfoil for DPPC-d 62 data used for comparison in this work.

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Correspondence to Michael R. Morrow.

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Morrow, M.R., Stewart, J., Taneva, S. et al. Perturbation of DPPC bilayers by high concentrations of pulmonary surfactant protein SP-B. Eur Biophys J 33, 285–290 (2004). https://doi.org/10.1007/s00249-003-0357-0

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