Small RNA-mediated Cry toxin silencing allows Bacillus thuringiensis to evade Caenorhabditis elegans avoidance behavioral defenses.

Small RNA-mediated Cry toxin silencing allows Bacillus thuringiensis to evade Caenorhabditis elegans avoidance behavioral defenses.
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小RNA介导的Cry毒素沉默使苏云金芽孢杆菌能够逃避秀丽隐杆线虫的回避行为防御。

DOI:
10.1093/nar/gkx959
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发表时间:
2018-01-09
影响因子:
14.9
通讯作者:
Sun M
Sun M
中科院分区:
生物学2区
文献类型:
--
作者:
Peng D;Luo X;Zhang N;Guo S;Zheng J;Chen L;Sun M

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病原体回避行为可以保护动物宿主免受微生物病原体的侵害。病原体在共同进化过程中进化出了特定的策略来应对这种宿主防御。然而,人们对这些对抗宿主回避行为防御的策略仍然知之甚少。在这里,我们使用秀丽隐杆线虫及其细菌病原体苏云金芽孢杆菌作为模型,并确定小RNA(sRNA)介导的Cry毒素沉默使病原体能够逃避宿主回避行为防御。苏云金芽孢杆菌菌株 YBT-1518 编码三种杀线虫 cry 基因,对秀丽隐杆线虫具有剧毒。然而,当 YBT-1518 处于宿主体外时,该菌株中最有效的毒素 Cry5Ba 的表达被沉默。 Cry5Ba 沉默是由 sRNA BtsR1 引起的,它通过直接碱基配对与cry5Ba 转录本的 RBS 位点结合并抑制 Cry5Ba 表达。被秀丽隐杆线虫摄入后,菌株 YBT-1518 在体内表达 Cry5Ba。 Cry5Ba 沉默可能会让苏云金芽孢杆菌避开线虫的行为防御,然后在摄入后表达毒素以杀死宿主并获得生存优势。我们的工作描述了一种新的 sRNA 介导的调控模型,以帮助病原体对抗宿主的回避行为防御。
Pathogen avoidance behavior protects animal hosts against microbial pathogens. Pathogens have evolved specific strategies during coevolution in response to such host defenses. However, these strategies for combatting host avoidance behavioral defenses remain poorly understood. Here, we used Caenorhabditis elegans and its bacterial pathogen Bacillus thuringiensis as a model and determined that small RNA (sRNA)-mediated Cry toxin silencing allowed pathogens to evade host avoidance behavioral defenses. The B. thuringiensis strain YBT-1518, which encodes three nematicidal cry genes, is highly toxic to C. elegans. However, the expression of the most potent toxin, Cry5Ba, was silenced in this strain when YBT-1518 was outside the host. Cry5Ba silencing was due to the sRNA BtsR1, which bound to the RBS site of the cry5Ba transcript via direct base pairing and inhibited Cry5Ba expression. Upon ingestion by C. elegans, Cry5Ba was expressed in vivo by strain YBT-1518. Cry5Ba silencing may allow B. thuringiensis to avoid nematode behavioral defenses and then express toxins once ingested to kill the host and gain a survival advantage. Our work describes a novel model of sRNA-mediated regulation to aid pathogens in combating host avoidance behavioral defenses.
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