Specialized ribosomes and specific ribosomal protein paralogs control translation of mitochondrial proteins.
J Cell Biol
; 217(1): 117-126, 2018 01 02.
Article
em En
| MEDLINE
| ID: mdl-29118025
ABSTRACT
Genome duplication in eukaryotes created paralog pairs of ribosomal proteins (RPs) that show high sequence similarity/identity. However, individual paralogs can confer vastly different effects upon cellular processes, e.g., specific yeast paralogs regulate actin organization, bud site selection, and mRNA localization, although how specificity is conferred is unknown. Changes in the RP composition of ribosomes might allow for specialized translation of different subsets of mRNAs, yet it is unclear whether specialized ribosomes exist and if paralog specificity controls translation. Using translatome analyses, we show that the translation of mitochondrial proteins is highly down-regulated in yeast lacking RP paralogs required for normal mitochondrial function (e.g., RPL1b). Although RPL1a and RPL1b encode identical proteins, Rpl1b-containing ribosomes confer more efficient translation of respiration-related proteins. Thus, ribosomes varying in RP composition may confer specialized functions, and RP paralog specificity defines a novel means of translational control.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Proteínas Ribossômicas
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Saccharomyces cerevisiae
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Biossíntese de Proteínas
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Proteínas de Saccharomyces cerevisiae
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Proteínas Mitocondriais
Idioma:
En
Revista:
J Cell Biol
Ano de publicação:
2018
Tipo de documento:
Article
País de afiliação:
Israel