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:
影响因子:
--
通讯作者:
Seifert HS
中科院分区:
文献类型:
--
作者:
Cahoon LA;Seifert HS
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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