Ribosome biogenesis and nucleocytoplasmic transport Ecm1 - a new pre-60S nuclear export factor in S. cerevisiae Unité de Génétique des Interactions Macromoléculaires URA CNRS2171, Institut Pasteur Yanhua YAO Supervisor: Micheline FROMONT-RACINE entrée doctorale 20081015-17
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Ribosome biogenesis and nucleocytoplasmic transport Ecm1 - a new pre-60S nuclear export factor in S. cerevisiae Unité de Génétique des Interactions Macromoléculaires.
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Ribosome biogenesis and nucleocytoplasmic transport
Ecm1 - a new pre-60S nuclear export factor
in S. cerevisiae
Unité de Génétique des Interactions MacromoléculairesURA CNRS2171, Institut Pasteur
Yanhua YAO
Supervisor: Micheline FROMONT-RACINE
Rentrée doctorale 20081015-17
Why study ribosome biogenesis?
• Essential Pathway • Very expensive for the cell (2000 ribosomes/min.)
•Not essential (Gavin et al., 2002, Nature)•Synthetic Lethality with nug1-1 and mtr2-33 (Bassler et al., 2001, Mol. Cell)
Genetic Interactions Network
ARX1
Nuclear Pore
ComplexeECM1
N
M
X
Z
YBCA
N
M
X
Z
YCA
(Decourty et al. 2008, P.N.A.S.)
B
Validation of genetic interactions
Double mutant: Slow growth or sick growth
Conclusion 1: When the NPC (nuclear pore complex) is compromised, Ecm1 is essential.
The depletion of Ecm1 affecte 60S biognesis
Conclusion 2: When the NPC is affected, Ecm1 becomes
essential for pre-60S nuclear export.
Rpl25-GFP
WT
ecm1∆
pom34∆
PGAL1-ECM1 pom34∆
Ecm1- a pre-60S factor
1 Kap1212 Kap1083 Nog14 Fpr45 Nog2Rpl
Conclusion 3: Ecm1 is conditionally associated with pre-60S particles.
Binding domain
onX
Y
(Brent and Ptashne 1985; Fields and Song, 1989) Activating domain
Two-hybid Yeast Screen
X: Ecm1
Y: Nup192
Conclusion 4: Ecm1 binds physically to NPC.
adapted from Bradatsch et al., 2007
Gadal et al., 2001Ho et al., 2000
Bradatschet al., 2007Hung et al., 2008
Yao et al., 2007
Ecm1 overlaps with other export pathway
Conclusion 5: Ecm1, Arx1 and Mex67 show subtle functional interactions involved in the same export process, but each protein has additional important cellular roles.