期刊
NUCLEIC ACIDS RESEARCH
卷 32, 期 19, 页码 5954-5961出版社
OXFORD UNIV PRESS
DOI: 10.1093/nar/gkh925
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资金
- NIGMS NIH HHS [GM19756, R01 GM019756, F32 GM019756] Funding Source: Medline
Ribosomes from the extreme thermophile Thermus thermophilus are capable of translation in a coupled transcription-translation system derived from Escherichia coli. At 45degreesC, T.thermophilus ribosomes translate at similar to25-30% of the maximal rate of E.coli ribosomes, and synthesize full-length protein. T.thermophilus and E.coli subunits can be combined to effect translation, with the spectrum of proteins produced depending upon the source of the 30S subunit. In this system, T.thermophilus ribosomes function in concert with E.coli translational factors and tRNAs, with elongation and release factors being supplied from the E.coli extract, and purified initiation factors (IFs) being added exogenously. Cloned and purified T.thermophilus IF1, IF2 and IF3 supported the synthesis of the same products in vitro as the E.coli factors, although the relative levels of some polypeptides were factor dependent. We conclude that, at least between these two phylogenetically distant species, translational factor function and subunit-subunit interactions are conserved. This functional compatibility is remarkable given the extreme and highly divergent environments to which these species have adapted.
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