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2014 ; 289
(49
): 33971-83
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Novel RNA-binding protein P311 binds eukaryotic translation initiation factor 3
subunit b (eIF3b) to promote translation of transforming growth factor ?1-3
(TGF-?1-3)
#MMPMID25336651
Yue MM
; Lv K
; Meredith SC
; Martindale JL
; Gorospe M
; Schuger L
J Biol Chem
2014[Dec]; 289
(49
): 33971-83
PMID25336651
show ga
P311, a conserved 8-kDa intracellular protein expressed in brain, smooth muscle,
regenerating tissues, and malignant glioblastomas, represents the first
documented stimulator of TGF-?1-3 translation in vitro and in vivo. Here we
initiated efforts to define the mechanism underlying P311 function. PONDR®
(Predictor Of Naturally Disordered Regions) analysis suggested and CD confirmed
that P311 is an intrinsically disordered protein, therefore requiring an
interacting partner to acquire tertiary structure and function.
Immunoprecipitation coupled with mass spectroscopy identified eIF3 subunit b
(eIF3b) as a novel P311 binding partner. Immunohistochemical colocalization, GST
pulldown, and surface plasmon resonance studies revealed that P311-eIF3b
interaction is direct and has a Kd of 1.26 ?m. Binding sites were mapped to the
non-canonical RNA recognition motif of eIF3b and a central 11-amino acid-long
region of P311, here referred to as eIF3b binding motif. Disruption of P311-eIF3b
binding inhibited translation of TGF-?1, 2, and 3, as indicated by luciferase
reporter assays, polysome fractionation studies, and Western blot analysis. RNA
precipitation assays after UV cross-linking and RNA-protein EMSA demonstrated
that P311 binds directly to TGF-? 5'UTRs mRNAs through a previously unidentified
RNA recognition motif-like motif. Our results demonstrate that P311 is a novel
RNA-binding protein that, by interacting with TGF-?s 5'UTRs and eIF3b, stimulates
the translation of TGF-?1, 2, and 3.