Covalent binding of the natural antimicrobial peptide indolicidin to DNA abasic sites.

Covalent binding of the natural antimicrobial peptide indolicidin to DNA abasic sites.
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DOI:
10.1093/nar/gkl667
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发表时间:
2006
影响因子:
14.9
通讯作者:
Pommier Y
Pommier Y
中科院分区:
生物学2区
文献类型:
--
作者:
Marchand C;Krajewski K;Lee HF;Antony S;Johnson AA;Amin R;Roller P;Kvaratskhelia M;Pommier Y

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杀吲哚菌素是一种在体外抑制HIV-1整合酶催化活性的宿主防御十三肽。在此,我们阐明了其整合酶抑制机制。使用交联和质谱足迹法,我们发现indolicidin干扰的催化整合酶-DNA复合物的形成,直接结合DNA。进一步的表征表明,肽与脱碱基位点形成共价连接。Indolicidin以相当的效率交联单链或双链DNA和病毒cDNA的各个位置。使用截短和化学修饰的肽,我们表明,脱碱基位点交联是独立的PWWP基序,但涉及indolicidin独特的赖氨酸残基和N-和C-末端NH 2基团。由于indolicidin也可以抑制拓扑异构酶I,我们认为在DNA水平上的多重作用可能是抗菌肽的共同特性。
Indolicidin is a host defense tridecapeptide that inhibits the catalytic activity of HIV-1 integrase in vitro. Here we have elucidated its mechanism of integrase inhibition. Using crosslinking and mass spectrometric footprinting approaches, we found that indolicidin interferes with formation of the catalytic integrase-DNA complex by directly binding DNA. Further characterization revealed that the peptide forms covalent links with abasic sites. Indolicidin crosslinks single- or double-stranded DNAs and various positions of the viral cDNA with comparable efficiency. Using truncated and chemically modified peptides, we show that abasic site crosslinking is independent of the PWWP motif but involves the indolicidin unique lysine residue and the N- and C- terminal NH2 groups. Because indolicidin can also inhibit topoisomerase I, we believe that multiple actions at the level of DNA might be a common property of antimicrobial peptides.
DOI: 10.1074/jbc.m209278200
发表时间: 2003-01-03
影响因子: 4.8
作者:
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期刊: Drug discovery today. Disease mechanisms
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