Potential key bases of ribosomal RNA to kingdom-specific spectra of antibiotic susceptibility and the possible archaeal origin of eukaryotes.

Potential key bases of ribosomal RNA to kingdom-specific spectra of antibiotic susceptibility and the possible archaeal origin of eukaryotes.
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核糖体 RNA 对抗生素敏感性王国特异性谱的潜在关键碱基和真核生物可能的古菌起源

DOI:
10.1371/journal.pone.0029468
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发表时间:
2012
期刊:
影响因子:
3.7
通讯作者:
Bu W
Bu W
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Xie Q;Wang Y;Lin J;Qin Y;Wang Y;Bu W

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为了支持真核生物的内共生起源假说,已经发现了许多证据来支持真核细胞的一些细胞器起源于细菌祖先的观点。虽然古生菌和真核生物共有的一些生化和分子遗传特性已经被证明,但宿主细胞的身份却很少受到关注。通过对507个16 S-18 S rDNA和347个23 S-28 S rDNA的比较,发现古生菌和真核生物在核糖体DNA上共有26个核苷酸的标记。这些特征存在于所有活的真核生物中,无论是原生生物、绿色植物、真菌还是动物。这一证据明确地支持了真核生物的古生起源。在核糖体RNA中,除了大肠杆菌中的A2058和酿酒酵母中的G2400之外,还存在其它20多个碱基具有王国特异性的位点。其中一些位点集中在23 S-28 S rRNA的肽基转移酶中心(PTC)。这些结果提示了解释核糖体的王国特异性耐药谱的潜在关键位点。
In support of the hypothesis of the endosymbiotic origin of eukaryotes, much evidence has been found to support the idea that some organelles of eukaryotic cells originated from bacterial ancestors. Less attention has been paid to the identity of the host cell, although some biochemical and molecular genetic properties shared by archaea and eukaryotes have been documented. Through comparing 507 taxa of 16S–18S rDNA and 347 taxa of 23S–28S rDNA, we found that archaea and eukaryotes share twenty-six nucleotides signatures in ribosomal DNA. These signatures exist in all living eukaryotic organisms, whether protist, green plant, fungus, or animal. This evidence explicitly supports the archaeal origin of eukaryotes. In the ribosomal RNA, besides A2058 in Escherichia coli vs. G2400 in Saccharomyces cerevisiae, there still exist other twenties of sites, in which the bases are kingdom-specific. Some of these sites concentrate in the peptidyl transferase centre (PTC) of the 23S–28S rRNA. The results suggest potential key sites to explain the kingdom-specific spectra of drug resistance of ribosomes.
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