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Spectrin from human erythrocytes binds to bilayer dispersions of both DMPC and DMPS:DMPC (1:1, w/w). However, no effect of bound spectrin on the conformation of the lipid head groups, as measured from the deuterium quadrupolar splittings of DMPC or DMPS specifically deuterated in the polar head groups, was detected in 1:1 mixtures of the two lipids containing either deuterated DMPC or DMPS. Neither the phase transition of the DMPS:DMPC mixtures, nor the spin-lattice relaxation time (T1) of the deuterated DMPS head group, was affected by spectrin. These results argue against any strong interaction of spectrin with phosphatidylserine and rule out the possibility that spectrin is responsible for the maintenance of PS in the inner monolayer of the erythrocyte membrane during the whole life-span of this cell.

Type

Journal article

Journal

FEBS Lett

Publication Date

13/02/1989

Volume

244

Pages

217 - 222

Keywords

Deuterium, Dimyristoylphosphatidylcholine, Erythrocytes, Humans, Lipid Bilayers, Magnetic Resonance Spectroscopy, Phosphatidylserines, Spectrin