Pressure study on symmetric and asymmetric phospholipid bilayers: effect of vesicle size on Prodan fluorescence.

Abstract:

:The bilayer phase behavior of symmetric and asymmetric phosphatidylcholines (PCs), 1,2-diheptadecanoyl-PC (C17PC), 1-palmitoyl-2-stearoyl-PC (PSPC), and 1-stearoyl-2-palmitoyl-PC (SPPC), with different vesicle sizes were investigated by a high-pressure fluorescence method using the polarity-sensitive fluorescent probe Prodan. The second derivative of fluorescence spectra for all the PCs of small-sized vesicle showed four minima characteristic of four membrane states on the spectra irrespective of the acyl-chain symmetry, whereas those of large-sized vesicle had one more minimum originating from the most hydrophilic site at the membrane surface. These findings indicate that Prodan molecules can distribute into multiple sites in the bilayer and move around the head-group region depending on the vesicle size. The behavior of the spectra in the SPPC bilayer suggested that the interdigitated gel phase had a less polar "pocket" formed by a space between uneven terminal methyl ends of the sn-1 and sn-2 chains. It turned out that the curvature of vesicles affects the distribution of the Prodan molecules in all phases, more particularly in the interdigitated gel phase.

journal_name

Ann N Y Acad Sci

authors

Goto M,Kusube M,Nishimoto M,Tamai N,Matsuki H,Kaneshina S

doi

10.1111/j.1749-6632.2009.05202.x

subject

Has Abstract

pub_date

2010-02-01 00:00:00

pages

68-76

eissn

0077-8923

issn

1749-6632

pii

NYAS5202

journal_volume

1189

pub_type

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