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Comparative Analysis of the Ribosomal Componentsof the Hydrogenosome-Containing Protist, Trichomonas vaginalis

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Abstract

The ribosomes of the amitochondriate but hydrogenosome-containing protist lineage, the trichomonads, have previously been reported to be prokaryotic or primitive eukaryotic, based on evidence that they have a 70S sedimentation coefficient and a small number of proteins, similar to prokaryotic ribosomes. In order to determine whether the components of the trichomonad ribosome indeed differ from those of typical eukaryotic ribosomes, the ribosome of a representative trichomonad, Trichomonas vaginalis, was characterized. The sedimentation coefficient of the T. vaginalis ribosome was smaller than that of Saccharomyces cerevisiae and larger than that of Escherichia coli. Based on two-dimensional PAGE analysis, the number of different ribosomal proteins was estimated to be approximately 80. This number is the same as those obtained for typical eukaryotes (approximately 80) but larger than that of E. coli (approximately 55). N-Terminal amino acid sequencing of 18 protein spots and the complete sequences of 4 ribosomal proteins as deduced from their genes revealed these sequences to display typical eukaryotic features. Phylogenetic analyses of the five ribosomal proteins currently available also clearly confirmed that the T. vaginalis sequences are positioned within a eukaryotic clade. Comparison of deduced secondary structure models of the small and large subunit rRNAs of T. vaginalis with those of other eukaryotes revealed that all helices commonly found in typical eukaryotes are present and conserved in T. vaginalis, while variable regions are shortened or lost. These lines of evidence demonstrate that the T. vaginalis ribosome has no prokaryotic or primitive eukaryotic features but is clearly a typical eukaryotic type.

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Acknowledgments

Work conducted at the Hayama laboratory in Japan was carried out under an ISM Cooperative Research Program (01ISMCRP-2047) and was supported by a grant from Japan Society for the Promotion of Science to T.H. (13640709). Work carried out at the Rockefeller University was supported by Grants MCB9615659 from the National Science Foundation and AI 11942 from the National Institutes of Health, U.S. Public Health Service, to M.M. Visits by T.H. to the New York laboratory and L.B.S. to the Hayama laboratory were supported by a U.S.–Japan Cooperative Research Project from the National Science Foundation and Japan Society for the Promotion of Science (INT-9726707). The authors would like to thank Dr. T. Uchiumi for providing information regarding the isolation of the ribosomes of Artemia salina and Drs. M. Hasegawa and H. Tokimatsu for helpful discussions.

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Arisue, N., Maki, Y., Yoshida, H. et al. Comparative Analysis of the Ribosomal Componentsof the Hydrogenosome-Containing Protist, Trichomonas vaginalis . J Mol Evol 59, 59–71 (2004). https://doi.org/10.1007/s00239-004-2604-0

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