Structure-Based Optimization of the Terminal Tripeptide in Glycopeptide Dendrimer Inhibitors of<i>Pseudomonas aeruginosa</i>Biofilms Targeting LecA
作者:Rameshwar U. Kadam、Myriam Bergmann、Divita Garg、Gabriele Gabrieli、Achim Stocker、Tamis Darbre、Jean-Louis Reymond
DOI:10.1002/chem.201302587
日期:2013.12.9
The galactopeptide dendrimer GalAG2 ((β‐Gal‐OC6H4CO‐Lys‐Pro‐Leu)4(Lys‐Phe‐Lys‐Ile)2Lys‐His‐Ile‐NH2) binds strongly to the Pseudomonas aeruginosa (PA) lectin LecA, and it inhibits PA biofilms, as well as disperses already established ones. By starting with the crystal structure of the terminal tripeptide moiety GalA‐KPL in complex with LecA, a computational mutagenesis study was carried out on the galactotripeptide
树枝状聚合物的galactopeptide GalAG2((β-Gal的-OC 6 H ^ 4 CO赖氨酸-脯氨酸-亮氨酸)4(赖氨酸-苯丙氨酸-赖氨酸-异亮氨酸)2赖氨酸-他-ILE-NH 2)结合强烈的铜绿假单胞菌(PA )凝集素LecA,可抑制PA生物膜,并分散已经建立的生物膜。从末端三肽部分GalA-KPL的晶体结构开始与LecA配合使用时,对半乳糖三肽进行了计算诱变研究,以优化肽与凝集素的相互作用。通过血凝抑制试验对25个突变体进行了实验评估,通过等温滴定量热法对17个突变体进行了实验评估,通过X射线晶体学对3个突变体进行了评估。这些三肽的两种,的GalA-KPY(解离常数(ķ d)= 2.7μ中号)和的GalA-KRL(ķ d = 2.7μ中号),是最有效的一价之间LECA的配体报道。与GalAG2(尤其是G2KPY)相比,基于这些三肽配体的树状聚合物显示出改善的PA生物膜抑制和分散((β-Gal的-OC