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- C R Woese
- Department of Microbiology, University of Illinois, Urbana 61801.
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- S Winker
- Department of Microbiology, University of Illinois, Urbana 61801.
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- R R Gutell
- Department of Microbiology, University of Illinois, Urbana 61801.
抄録
<jats:p>The four-base loops that cap many double-helical structures in rRNA (the so-called "tetra-loops") exhibit highly invariant to highly variable sequences depending upon their location in the molecule. However, in the vast majority of these cases the sequence of a tetra-loop is independent of its location and conforms to one of three general motifs, GNRA, UNCG, and (more rarely) CUUG. For the most frequently varying of the 16S rRNA tetra-loops, that at position 83 (Escherichia coli numbering), the three sequences CUUG, UUCG, and GCAA account for almost all examples encountered, and each of them has independently arisen at least a dozen times. The closing base pair of tetra-loop hairpins reflects the loop sequence, tending to be C.G for UUCG loops and G.C for CUUG loops.</jats:p>
収録刊行物
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- Proceedings of the National Academy of Sciences
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Proceedings of the National Academy of Sciences 87 (21), 8467-8471, 1990-11
Proceedings of the National Academy of Sciences