A common motif organizes the structure of multi-helix loops in 16 S and 23 S ribosomal RNAs.
J Mol Biol
; 283(3): 571-83, 1998 Oct 30.
Article
em En
| MEDLINE
| ID: mdl-9784367
ABSTRACT
Phylogenetic and chemical probing data indicate that a modular RNA motif, common to loop E of eucaryotic 5 S ribosomal RNA (rRNA) and the alpha-sarcin/ricin loop of 23 S rRNA, organizes the structure of multi-helix loops in 16 S and 23 S ribosomal RNAs. The motif occurs in the 3' domain of 16 S rRNA at positions 1345-1350/1372-1376 (Escherichia coli numbering), within the three-way junction loop, which binds ribosomal protein S7, and which contains nucleotides that help to form the binding site for P-site tRNA in the ribosome. The motif also helps to structure a three-way junction within domain I of 23 S, which contains many universally conserved bases and which lies close in the primary and secondary structure to the binding site of r-protein L24. Several other highly conserved hairpin, internal, and multi-helix loops in 16 S and 23 S rRNA contain the motif, including the core junction loop of 23 S and helix 27 in the core of 16 S rRNA. Sequence conservation and range of variation in bacteria, archaea, and eucaryotes as well as chemical probing and cross-linking data, provide support for the recurrent and autonomous existence of the motif in ribosomal RNAs. Besides its presence in the hairpin ribozyme, the loop E motif is also apparent in helix P10 of bacterial RNase P, in domain P7 of one sub-group of group I introns, and in domain 3 of one subgroup of group II introns.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
RNA Bacteriano
/
RNA Ribossômico 16S
/
RNA Ribossômico 23S
/
Escherichia coli
Idioma:
En
Revista:
J Mol Biol
Ano de publicação:
1998
Tipo de documento:
Article
País de afiliação:
Estados Unidos