title: Potential key bases of ribosomal RNA to kingdom-specific spectra of antibiotic susceptibility and the possible archaeal origin of eukaryotes.
abstract: 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.
authors.affiliation: Department of Zoology and Developmental Biology, College of Life Sciences, Nankai University, Tianjin, China. qiangxie@nankai.edu.cn
authors.forename: Qiang
authors.initials: Q
authors.lastname: Xie
authors.forename: Yanhui
authors.initials: Y
authors.lastname: Wang
authors.forename: Jinzhong
authors.initials: J
authors.lastname: Lin
authors.forename: Yan
authors.initials: Y
authors.lastname: Qin
authors.forename: Ying
authors.initials: Y
authors.lastname: Wang
authors.forename: Wenjun
authors.initials: W
authors.lastname: Bu
mesh_terms: D000900:Anti-Bacterial Agents / Q000378:metabolism*; D001105:Archaea / Q000235:genetics*; D020029:Base Pairing; D001483:Base Sequence; D001665:Binding Sites; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism; D056890:Eukaryota / Q000235:genetics*; D008969:Molecular Sequence Data; D009690:Nucleic Acid Conformation; D010458:Peptidyl Transferases / Q000378:metabolism; D012335:RNA, Ribosomal / Q000235:genetics* / Q000378:metabolism*; D012270:Ribosomes / Q000378:metabolism*; D012441:Saccharomyces cerevisiae / Q000235:genetics / Q000378:metabolism; D013329:Structure-Activity Relationship
chemical_list: D000900:Anti-Bacterial Agents; D012335:RNA, Ribosomal; D010458:Peptidyl Transferases