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- W187452277 abstract "Abstract The L-rRNA and S-rRNA components of Caldariella acidophila (maximum growth temperature, 90°C), Bacillus acidocaldarius (maximum growth temperature, 70°C) and Escherichia coli (maximum growth temperature, 47°C), have been characterized by thermal ‘melting’ methods with respect to (i) heat stability, (ii) base composition of bihelical and single-stranded parts, (iii) length of the ‘independently melting’ double-helical segments, and (iv) helix content of the rRNA chains. (1) The rRNA species of C. acidophila are 11°C and 7°C higher in Tm than those of, respectively, E. coli and B. acidocaldarius. (2) Bihelical domains of the extreme thermophile rRNA (G·C%, 63–64) are richer in G·C basepairs than those of either B. acidocaldarius (G·C%, 59), or E. coli (G·C%, 55); the enhanced G·C content of the secondary structure structure regions is partly accounted for by a preferential concentration of G+C in bihelical parts, the single-stranded regions of the rRNA chains being 13–14% poorer in (G+C) than the base-paired regions. (3) The length of the ‘independently melting’ bihelical units has been calculated from the G·C content and Tm of the ‘melting’ species and found to be greater, on average, than those of both the mesophile and the moderate thermophile rRNA species; both the increased G·C A·U ratio and the increased average length of the ‘independently melting’ bihelical segments may contribute to the enhanced thermal stability of the C. acidophila rRNA species. (4) It is estimated by ‘melting’ hyperchromicity data that a fraction, 65–70% of the bases of the rRNA species investigated may be involved in hydrogen-bonded base-pairing, irrespective of degree of thermophily of the micro-organisms." @default.
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- W187452277 date "1982-10-01" @default.
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- W187452277 title "Secondary structure features of ribosomal RNA species of extremely thermoacidophilic archaebacteria (Caldariella acidophila), moderate thermoacidophilic and mesophilic eubacteria" @default.
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- W187452277 doi "https://doi.org/10.1016/0167-4781(82)90165-8" @default.
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