TY - JOUR
T1 - Sen34p depletion blocks tRNA splicing in vivo and delays rRNA processing
AU - Volta, Viviana
AU - Ceci, Marcello
AU - Emery, Bertrand
AU - Bachi, Angela
AU - Petfalski, Elisabeth
AU - Tollervey, David
AU - Linder, Patrick
AU - Marchisio, Pier Carlo
AU - Piatti, Simonetta
AU - Biffo, Stefano
N1 - Funding Information:
We acknowledge Susan Baserga, Mark Longtine, Massimilano Pagani, Herbert Tschochner, Alessandro Fatica, Annamaria Barbieri, and Leonardo Sala for reagents and advice. Work in the Linder lab is supported by Swiss National Science Foundation (PL). S.B. is supported by AIRC (Associazione Italiana Ricerca contro il Cancro).
PY - 2005/11/11
Y1 - 2005/11/11
N2 - Tif6p (eIF6) is necessary for 60S biogenesis, rRNA maturation and must be released from 60S to permit 80S assembly and translation. We characterized Tif6p interactors. Tif6p is mostly on 66S-60S pre-ribosomes, partly free. Tif6p complex(es) contain nucleo-ribosomal factors and Asc1p. Surprisingly, Tif6p particle contains the low-abundance endonuclease Sen34p. We analyzed Sen34p role on rRNA/tRNA synthesis, in vivo. Sen34p depletion impairs tRNA splicing and causes unexpected 80S accumulation. Accordingly, Sen34p overexpression causes 80S decrease and increased polysomes which suggest increased translational efficiency. With delayed kinetics, Sen34p depletion impairs rRNA processing. We conclude that Sen34p is absolutely required for tRNA splicing and that it is a rate-limiting element for efficient translation. Finally, we confirm that Tif6p accompanies 27S pre-rRNA maturation to 25S rRNA and we suggest that Sen34p endonuclease in Tif6p complex may affect also rRNA maturation.
AB - Tif6p (eIF6) is necessary for 60S biogenesis, rRNA maturation and must be released from 60S to permit 80S assembly and translation. We characterized Tif6p interactors. Tif6p is mostly on 66S-60S pre-ribosomes, partly free. Tif6p complex(es) contain nucleo-ribosomal factors and Asc1p. Surprisingly, Tif6p particle contains the low-abundance endonuclease Sen34p. We analyzed Sen34p role on rRNA/tRNA synthesis, in vivo. Sen34p depletion impairs tRNA splicing and causes unexpected 80S accumulation. Accordingly, Sen34p overexpression causes 80S decrease and increased polysomes which suggest increased translational efficiency. With delayed kinetics, Sen34p depletion impairs rRNA processing. We conclude that Sen34p is absolutely required for tRNA splicing and that it is a rate-limiting element for efficient translation. Finally, we confirm that Tif6p accompanies 27S pre-rRNA maturation to 25S rRNA and we suggest that Sen34p endonuclease in Tif6p complex may affect also rRNA maturation.
KW - 60S
KW - Pre-rRNA
KW - RACK1
KW - eIF3
KW - eIF6 (alias p27BBP)
UR - http://www.scopus.com/inward/record.url?scp=25844471053&partnerID=8YFLogxK
U2 - 10.1016/j.bbrc.2005.09.012
DO - 10.1016/j.bbrc.2005.09.012
M3 - Article
SN - 0006-291X
VL - 337
SP - 89
EP - 94
JO - Biochemical and Biophysical Research Communications
JF - Biochemical and Biophysical Research Communications
IS - 1
ER -