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- W2073213996 abstract "We report structural studies in aqueous solution on backbone cyclic peptides that possess potent antimicrobial activity specifically against Pseudomonas sp. The peptides target the β-barrel outer membrane protein LptD, which plays an essential role in lipopolysaccharide transport to the outer membrane. The peptide L27-11 contains a 12-residue loop (T(1)W(2)L(3)K(4)K(5)R(6)R(7)W(8)K(9)K(10)A(11)K(12)) linked to a DPro-LPro template. Two related peptides were also studied, one with various Lys to ornithine or diaminobutyric acid substitutions as well as a DLys(6) (called LB-01), and another containing the same loop sequence, but linked to an LPro-DPro template (called LB-02). NMR studies and MD simulations show that L27-11 and LB-01 adopt β-hairpin structures in solution. In contrast, LB-02 is more flexible and importantly, adopts a wide variety of different backbone conformations, but not β-hairpin conformations. L27-11 and LB-01 show antimicrobial activity in the nanomolar range against Pseudomonas aeruginosa, whereas LB-02 is essentially inactive. Thus the β-hairpin structure of the peptide is important for antimicrobial activity. An alanine scan of L27-11 revealed that tryptophan side chains (W(2)/W(8)) displayed on opposite faces of the β-hairpin represent key groups contributing to antimicrobial activity." @default.
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- W2073213996 date "2013-09-01" @default.
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- W2073213996 title "Structural studies of β-hairpin peptidomimetic antibiotics that target LptD in Pseudomonas sp." @default.
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- W2073213996 doi "https://doi.org/10.1016/j.bmc.2013.07.013" @default.
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