Ribosomal frameshifting in response to hypomodified tRNAs in Xenopus oocytes.
Biochem Biophys Res Commun
; 375(1): 86-90, 2008 Oct 10.
Article
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| MEDLINE
| ID: mdl-18675785
ABSTRACT
We used Xenopus oocytes as an intracellular system to study ribosomal frameshifting. Microinjection of oocytes with a construct encoding the naturally occurring UUU or AAC codon at the frameshift site demonstrated that the level of frameshifting was similar or lower than found normally in retroviral frameshifting in mammalian cells, suggesting that oocytes are a reliable system to study this event. Phenylalanine (Phe) or asparagine (Asn) tRNAs with and without the highly modified wyebutoxine (Y) or queuosine (Q) base, respectively, were microinjected to assess their ability to promote frameshifting. tRNAPhe+Y inhibited the level of frameshifting, while tRNAPhe-Y promoted frameshifting providing evidence that the hypomodified form does not act only to enhance frameshifting, but is an essential requirement. Both tRNAAsn+Q and tRNAAsn-Q were used indiscriminately in frameshifting, whether the frameshift site contained the wild-type AAC, or the mutant AAU codon, suggesting that Q base modification status does not influence this process.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
ARN de Transferencia de Asparagina
/
ARN de Transferencia de Fenilalanina
/
Sistema de Lectura Ribosómico
Límite:
Animals
Idioma:
En
Revista:
Biochem Biophys Res Commun
Año:
2008
Tipo del documento:
Article
País de afiliación:
Estados Unidos