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2015 ; 43
(18
): 8973-89
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NUFIP and the HSP90/R2TP chaperone bind the SMN complex and facilitate assembly
of U4-specific proteins
#MMPMID26275778
Bizarro J
; Dodré M
; Huttin A
; Charpentier B
; Schlotter F
; Branlant C
; Verheggen C
; Massenet S
; Bertrand E
Nucleic Acids Res
2015[Oct]; 43
(18
): 8973-89
PMID26275778
show ga
The Sm proteins are loaded on snRNAs by the SMN complex, but how snRNP-specific
proteins are assembled remains poorly characterized. U4 snRNP and box C/D snoRNPs
have structural similarities. They both contain the 15.5K and proteins with NOP
domains (PRP31 for U4, NOP56/58 for snoRNPs). Biogenesis of box C/D snoRNPs
involves NUFIP and the HSP90/R2TP chaperone system and here, we explore the
function of this machinery in U4 RNP assembly. We show that yeast Prp31 interacts
with several components of the NUFIP/R2TP machinery, and that these interactions
are separable from each other. In human cells, PRP31 mutants that fail to stably
associate with U4 snRNA still interact with components of the NUFIP/R2TP system,
indicating that these interactions precede binding of PRP31 to U4 snRNA.
Knock-down of NUFIP leads to mislocalization of PRP31 and decreased association
with U4. Moreover, NUFIP is associated with the SMN complex through direct
interactions with Gemin3 and Gemin6. Altogether, our data suggest a model in
which the NUFIP/R2TP system is connected with the SMN complex and facilitates
assembly of U4 snRNP-specific proteins.