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2017 ; 474
(18
): 3109-3120
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gab.com Text
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English Wikipedia
The helicase, DDX3X, interacts with poly(A)-binding protein 1 (PABP1) and
caprin-1 at the leading edge of migrating fibroblasts and is required for
efficient cell spreading
#MMPMID28733330
Copsey AC
; Cooper S
; Parker R
; Lineham E
; Lapworth C
; Jallad D
; Sweet S
; Morley SJ
Biochem J
2017[Aug]; 474
(18
): 3109-3120
PMID28733330
show ga
DDX3X, a helicase, can interact directly with mRNA and translation initiation
factors, regulating the selective translation of mRNAs that contain a structured
5' untranslated region. This activity modulates the expression of mRNAs
controlling cell cycle progression and mRNAs regulating actin dynamics,
contributing to cell adhesion and motility. Previously, we have shown that
ribosomes and translation initiation factors localise to the leading edge of
migrating fibroblasts in loci enriched with actively translating ribosomes,
thereby promoting steady-state levels of ArpC2 and Rac1 proteins at the leading
edge of cells during spreading. As DDX3X can regulate Rac1 levels, cell motility
and metastasis, we have examined DDX3X protein interactions and localisation
using many complementary approaches. We now show that DDX3X can physically
interact and co-localise with poly(A)-binding protein 1 and caprin-1 at the
leading edge of spreading cells. Furthermore, as depletion of DDX3X leads to
decreased cell motility, this provides a functional link between DDX3X, caprin-1
and initiation factors at the leading edge of migrating cells to promote cell
migration and spreading.