The interplay of Hfq, poly(A) polymerase I and exoribonucleases at the 3' ends of RNAs resulting from Rho-independent termination: A tentative model.
RNA Biol
; 10(4): 602-9, 2013 Apr.
Article
em En
| MEDLINE
| ID: mdl-23392248
ABSTRACT
Discovered in eukaryotes as a modification essential for mRNA function, polyadenylation was then identified as a means used by all cells to destabilize RNA. In Escherichia coli, most accessible 3' RNA extremities are believed to be potential targets of poly(A) polymerase I. However, some RNAs might be preferentially adenylated. After a short statement of the current knowledge of poly(A) metabolism, we discuss how Hfq could affect recognition and polyadenylation of RNA terminated by Rho-independent terminators. Comparison of RNA terminus leads to the proposal that RNAs harboring 3' terminal features required for Hfq binding are not polyadenylated, whereas those lacking these structural elements can gain the oligo(A) tails that initiate exonucleolytic degradation. We also speculate that Hfq stimulates the synthesis of longer tails that could be used as Hfq-binding sites involved in non-characterized functions of Hfq-dependent sRNAs.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Poli A
/
Proteínas Repressoras
/
RNA Mensageiro
/
Proteínas de Ligação a RNA
/
Estabilidade de RNA
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Proteínas de Escherichia coli
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Poliadenilação
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Fator Proteico 1 do Hospedeiro
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Escherichia coli
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Exorribonucleases
Tipo de estudo:
Prognostic_studies
Idioma:
En
Ano de publicação:
2013
Tipo de documento:
Article