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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Cell+Biol
2018 ; 217
(1
): 117-126
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Specialized ribosomes and specific ribosomal protein paralogs control translation
of mitochondrial proteins
#MMPMID29118025
Segev N
; Gerst JE
J Cell Biol
2018[Jan]; 217
(1
): 117-126
PMID29118025
show ga
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.