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• W2047207570 abstract "Mastoparan B (MP-B) is an antimicrobial cationic tetradecapeptide amide isolated from the venom of the hornet Vespa basalis. NMR spectroscopy was used to study the membrane associated structures of MP-B in various model membrane systems such as 120 mM DPC micelles, 200 mM SDS micelles, and 3%(w/v) DMPC/DHPC (1:2) bicelles. In all systems, MP-B has an amphiphilic alpha-helical structure from Lys2 to Leu14. NOESY experiments performed on MP-B in nondeuterated SDS micelles show that protons in the indole ring of Trp9 are in close contact with methylene protons of SDS micelles. T1 relaxation data and NOE data revealed that the bound form of MP-B may be dominant in SDS micelles. The interactions between MP-B and zwitterionic DPC micelles were much weaker than those between MP-B and anionic SDS micelles. By substitution of Trp9 with Ala9, the pore-forming activity of MP-B was decreased dramatically. All of these results imply that strong electrostatic interactions between the positively charged Lys residues in MP-B and the anionic phospholipid head groups must be the primary factor for MP-B binding to the cell membrane. Then, insertion of the indole ring of Trp9 into the membrane, as well as the amphiphilic alpha-helical structures of MP-B may allow MP-B to span the lipid bilayer through the C-terminal portion. These structural features are crucial for the potent antibiotic activities of MP-B." @default.
• W2047207570 created "2016-06-24" @default.
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• W2047207570 date "2001-02-01" @default.
• W2047207570 modified "2023-10-06" @default.
• W2047207570 title "Interactions Between Mastoparan B and the Membrane Studied by¹H NMR Spectroscopy" @default.
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• W2047207570 doi "https://doi.org/10.1080/07391102.2001.10506691" @default.
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