Suppression of the microRNA pathway by bacterial effector proteins.

Suppression of the microRNA pathway by bacterial effector proteins.
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DOI:
10.1126/science.1159505
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发表时间:
2008-08-15
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Voinnet O
Voinnet O
中科院分区:
其他
文献类型:
--
作者:
Navarro L;Jay F;Nomura K;He SY;Voinnet O

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植物和动物感知病原体相关分子模式(PAMPs),进而差异调节微小RNA(miRNA)的一个子集。然而,miRNA通路在先天免疫中的作用程度仍然未知。在这里,我们表明,拟南芥的miRNA缺陷型突变体部分恢复生长的3型分泌缺陷型突变体的假单胞菌。这些突变体也维持了非致病性荧光假单胞菌和大肠杆菌菌株的生长,暗示miRNA是植物基础防御的关键组分。因此,我们已经鉴定了抑制一些PAMP响应性miRNA的转录激活、miRNA生物发生、稳定性或活性的P.lingae效应子。这些结果提供了令人信服的证据,证明像病毒一样,细菌已经进化到抑制RNA沉默以引起疾病。
Plants and animals sense pathogen-associated molecular patterns (PAMPs) and in turn differentially regulate a subset of microRNAs (miRNAs). However, the extent to which the miRNA pathway contributes to innate immunity remains unknown. Here, we show that miRNA-deficient mutants of Arabidopsis partly restore growth of a type-three secretion-defective mutant of Pseudomonas syringae. These mutants also sustained growth of non-pathogenic Pseudomonas fluorescens and Escherichia coli strains, implicating miRNAs as key components of plant basal defense. Accordingly, we have identified P. syringae effectors that suppress transcriptional activation of some PAMP-responsive miRNAs, miRNA biogenesis, stability or activity. These results provide compelling evidence that, like viruses, bacteria have evolved to suppress RNA silencing to cause disease.
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