Component of Splicing Factor SF3b Plays a Key Role in Translational Control of Polyribosomes on the Endoplasmic Reticulum

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 2019 Apr 21

PMID 31004060

Citations 15

Authors

Tomonori Ueno

Yuki Taga

Rei Yoshimoto

Akila Mayeda

Shunji Hattori

Kiyoko Ogawa-Goto

Affiliations

Soon will be listed here.

Abstract

One of the morphological hallmarks of terminally differentiated secretory cells is highly proliferated membrane of the rough endoplasmic reticulum (ER), but the molecular basis for the high rate of protein biosynthesis in these cells remains poorly documented. An important aspect of ER translational control is the molecular mechanism that supports efficient use of targeted mRNAs in polyribosomes. Here, we identify an enhancement system for ER translation promoted by p180, an integral ER membrane protein we previously reported as an essential factor for the assembly of ER polyribosomes. We provide evidence that association of target mRNAs with p180 is critical for efficient translation, and that SF3b4, an RNA-binding protein in the splicing factor SF3b, functions as a cofactor for p180 at the ER and plays a key role in enhanced translation of secretory proteins. A -element in the 5' untranslated region of collagen and fibronectin genes is important to increase translational efficiency in the presence of p180 and SF3b4. These data demonstrate that a unique system comprising a p180-SF3b4-mRNA complex facilitates the selective assembly of polyribosomes on the ER.

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