An alternative DNA structure is necessary for pilin antigenic variation in Neisseria gonorrhoeae.

An alternative DNA structure is necessary for pilin antigenic variation in Neisseria gonorrhoeae.
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DOI:
10.1126/science.1175653
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发表时间:
2009-08-07
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Seifert HS
Seifert HS
中科院分区:
其他
文献类型:
--
作者:
Cahoon LA;Seifert HS

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病原体可以利用DNA重组来促进表面结构的抗原性变异以避免免疫检测。我们确定了一个顺式作用的DNA序列附近的抗原可变菌毛基因座的人类病原体,淋球菌。这16个碱基对富含G的序列是菌毛蛋白抗原变异所必需的,并在体外形成鸟嘌呤四联体(G4)结构。破坏结构的个别突变也阻断菌毛蛋白抗原变异,并防止G4区域内发生重组所需的切口。结合和稳定G4结构的化合物也抑制菌毛蛋白抗原变异,并防止在富含G的链上出现切口。该位点构成重组起始序列/结构,其指导基因转化至特定染色体基因座。
Pathogens can utilize DNA recombination to promote antigenic variation of surface structures to avoid immune detection. We identified a cis-acting DNA sequence near the antigenically variable pilin locus of the human pathogen, Neisseria gonorrhoeae. This 16 base pair G-rich sequence was required for pilin antigenic variation and formed a guanine quartet (G4) structure in vitro. Individual mutations that disrupted the structure also blocked pilin antigenic variation and prevented nicks required for recombination from occurring within the G4 region. A compound that binds and stabilizes G4 structures also inhibited pilin antigenic variation and prevented nicks from occurring on the G-rich strand. This site constitutes a recombination initiation sequence/structure that directs gene conversion to a specific chromosomal locus.
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