The Role of Terminal Functionality in the Membrane and Antibacterial Activity of Peptaibol-Mimetic Aib Foldamers
作者:Catherine Adam、Anna D. Peters、M. Giovanna Lizio、George F. S. Whitehead、Vincent Diemer、James A. Cooper、Scott L. Cockroft、Jonathan Clayden、Simon J. Webb
DOI:10.1002/chem.201705299
日期:2018.2.9
antibiotics that typically feature an N‐terminal acetyl cap, a C‐terminal aminoalcohol, and a high proportion of α‐aminoisobutyric acid (Aib) residues. To establish how each feature might affect the membrane‐activity of peptaibols, biomimetic Aib foldamers with different lengths and terminal groups were synthesised. Vesicle assays showed that long foldamers (eleven Aib residues) with hydrophobic termini
Peptaibols 是肽类抗生素,通常具有 N 端乙酰帽、C 端氨基醇和高比例的 α-氨基异丁酸 (Aib) 残基。为了确定每个特征如何影响 peptaibols 的膜活性,合成了具有不同长度和末端基团的仿生 Aib 折叠体。囊泡测定表明,具有疏水末端的长折叠体(11 个 Aib 残基)具有最高的离子载体活性。C端酸或伯酰胺抑制活性,而用叠氮基取代N端乙酰基几乎没有区别。晶体学显示 N 3 Aib 11 CH 2 OTIPS 折叠成 3 10螺旋长 2.91 nm,接近双层疏水宽度。平面双层电导分析仅显示N-乙酰化折叠体的离散离子通道。然而,具有疏水末端的长折叠体具有最高的抗菌活性,表明囊泡中的离子载体活性比观察离散离子通道更好地指示抗菌活性。