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Solid-state NMR investigation of the depth of insertion of protegrin-1 in lipid bilayers using paramagnetic Mn2+.

Abstract：

:The depth of insertion of an antimicrobial peptide, protegrin-1 (PG-1), in lipid bilayers is investigated using solid-state NMR. Paramagnetic Mn(2+) ions bind to the surface of lipid bilayers and induce distance-dependent dipolar relaxation of nuclear spins. By comparing the signal dephasing of the peptide with that of the lipids, whose segmental depths of insertion are known, we determined the depths of several residues of PG-1 in 1,2 dilauryl-sn-glycero-3-phosphotidylcholine (DLPC) bilayers. We found that residues G2 at the N-terminus and F12 at the beta-turn of the peptide reside near the membrane surface, whereas L5 and V16 are embedded in the acyl chain region. The depths increase in the order of G2 < F12 < L5 < V16. These intensity-dephasing results are confirmed by direct measurement of the paramagnetically enhanced (13)C transverse relaxation rates. The relative depths indicate that PG-1 is tilted from the bilayer normal, which is consistent with independent solid-state NMR measurements of PG-1 orientation in the same lipids (Yamaguchi et al., 2001). They also indicate that PG-1 is fully immersed in the lipid bilayer. However, a quantitative mismatch between the bilayer thickness and PG-1 length suggests a local thinning of the DLPC bilayer by 8-10 A. The depth sensitivity of this Mn(2+) dephasing technique is tunable with the Mn(2+) concentration to focus on different regions of the lipid bilayer.

journal_name

Biophys J

journal_title

Biophysical journal

authors

Buffy JJ,Hong T,Yamaguchi S,Waring AJ,Lehrer RI,Hong M

doi

10.1016/S0006-3495(03)74660-8

subject

Has Abstract

pub_date

2003-10-01 00:00:00

pages

2363-73

issue

4

eissn

0006-3495

issn

1542-0086

pii

S0006-3495(03)74660-8

journal_volume

85

pub_type

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