CdiA from Enterobacter cloacae delivers a toxic ribosomal RNase into target bacteria.

CdiA from Enterobacter cloacae delivers a toxic ribosomal RNase into target bacteria.
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DOI:
10.1016/j.str.2014.02.012
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发表时间:
2014-05-06
期刊:
影响因子:
5.7
通讯作者:
Hayes, Christopher S.
Hayes, Christopher S.
中科院分区:
生物学2区
文献类型:
--
作者:
Beck, Christina M.;Morse, Robert P.;Cunningham, David A.;Iniguez, Angelina;Low, David A.;Goulding, Celia W.;Hayes, Christopher S.

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接触依赖性生长抑制(CDI)是细菌间竞争的机制之一。 CDI+ 细胞输出大型 CdiA 效应蛋白,其携带多种 C 末端毒素结构域 (CdiA-CT)。 CdiA-CT 毒素被同源 CdiI 免疫蛋白特异性中和,以保护产毒细胞免受自身抑制。在这里,我们利用结构测定来阐明阴沟肠杆菌 (ECL) 中一种独特的 CDI 毒素的活性。 CdiA-CTECL 的结构类似于大肠菌素 E3 的 C 端核酸酶结构域,可切割 16S 核糖体 RNA 以破坏蛋白质合成。根据这种结构同源性,我们表明 CdiA-CTECL 使用相同的核酸酶活性来抑制细菌生长。令人惊讶的是,虽然大肠杆菌素E3和CdiAECL携带相同的毒素结构域,但相应的免疫蛋白在序列、结构和毒素结合位点上并不相关。总之,这些发现揭示了 16S rRNA 酶之间意想不到的多样性,并表明这些核酸酶对于各种毒素递送平台来说是强大且通用的有效负载。
Contact-dependent growth inhibition (CDI) is one mechanism of inter-bacterial competition. CDI+ cells export large CdiA effector proteins, which carry a variety of C-terminal toxin domains (CdiA-CT). CdiA-CT toxins are specifically neutralized by cognate CdiI immunity proteins to protect toxin-producing cells from auto-inhibition. Here, we use structure determination to elucidate the activity of a unique CDI toxin from Enterobacter cloacae (ECL). The structure of CdiA-CTECL resembles the C-terminal nuclease domain of colicin E3, which cleaves 16S ribosomal RNA to disrupt protein synthesis. In accord with this structural homology, we show that CdiA-CTECL uses the same nuclease activity to inhibit bacterial growth. Surprisingly, although colicin E3 and CdiAECL carry equivalent toxin domains, the corresponding immunity proteins are unrelated in sequence, structure and toxin-binding site. Together, these findings reveal unexpected diversity amongst 16S rRNases and suggest that these nucleases are robust and versatile payloads for a variety of toxin-delivery platforms.
DOI: 10.1371/journal.pgen.1002217
发表时间: 2011-08
期刊: PLoS genetics
影响因子: 4.5
作者:
Poole SJ;Diner EJ;Aoki SK;Braaten BA;t'Kint de Roodenbeke C;Low DA;Hayes CS
通讯作者: Hayes CS
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影响因子: 11.1
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DOI: 10.1101/gad.182345.111
发表时间: 2012-03-01
影响因子: 10.5
作者:
Diner, Elie J.;Beck, Christina M.;Hayes, Christopher S.
通讯作者: Hayes, Christopher S.
DOI: 10.1073/pnas.78.10.6324
发表时间: 1981-01-01
期刊: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA-BIOLOGICAL SCIENCES
影响因子: --
作者:
CHAO, L;LEVIN, BR
通讯作者: LEVIN, BR