Bacterial argonaute samples the transcriptome to identify foreign DNA.

Bacterial argonaute samples the transcriptome to identify foreign DNA.
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DOI:
10.1016/j.molcel.2013.08.014
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发表时间:
2013-09-12
期刊:
影响因子:
16
通讯作者:
Aravin, Alexei A.
Aravin, Alexei A.
中科院分区:
生物学1区
文献类型:
--
作者:
Olovnikov, Ivan;Chan, Ken;Sachidanandam, Ravi;Newman, Dianne K.;Aravin, Alexei A.

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真核生物Argonautes结合小RNA,并将其作为向导来寻找互补RNA靶点并诱导基因沉默。虽然真核Argonautes的同源物存在于许多细菌和古细菌中,但它们的小RNA伴侣和功能尚不清楚。我们发现球形红细菌的Argonaute(RsAgo)与15-19 nt的RNA相关联,这些RNA对应于大多数转录物。RsAgo还结合单链22-24 nt DNA分子,所述单链22-24 nt DNA分子与小RNA互补并且富含来源于外源质粒的序列以及基因组编码的外源核酸如转座子和噬菌体基因。RsAgo在异源E.大肠杆菌系统导致质粒衍生的小RNA和DNA的形成以及质粒降解。在一个R。在缺乏RsAgo的类球孢菌突变体中,质粒编码基因的表达升高。我们的研究结果表明,在真核生物中发现的RNAi相关过程在细菌和靶向外源核酸中也是保守的。
Eukaryotic Argonautes bind small RNAs and use them as guides to find complementary RNA targets and induce gene silencing. Though homologs of eukaryotic Argonautes are present in many bacteria and archaea their small RNA partners and functions are unknown. We found that the Argonaute of Rhodobacter sphaeroides (RsAgo) associates with 15-19 nt RNAs that correspond to the majority of transcripts. RsAgo also binds single-stranded 22-24 nt DNA molecules that are complementary to the small RNAs and enriched in sequences derived from exogenous plasmids as well as genome-encoded foreign nucleic acids such as transposons and phage genes. Expression of RsAgo in the heterologous E. coli system leads to formation of plasmid– derived small RNA and DNA and plasmid degradation. In a R. sphaeroides mutant lacking RsAgo, expression of plasmid-encoded genes is elevated. Our results indicate that RNAi-related processes found in eukaryotes are also conserved in bacteria and target foreign nucleic acids.
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