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| Status |
Public on Feb 04, 2022 |
| Title |
Vigilin/HDLBP promotes translation of endoplasmic reticulum-targeted mRNAs (A549 HDLBP KO and WT) |
| Organism |
Homo sapiens |
| Experiment type |
Expression profiling by high throughput sequencing
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| Summary |
The biological role of RNA-binding proteins (RBPs) in the secretory pathway and their contribution to the recognition and co-translational targeting of ER-localized mRNAs is not well established. In this work we used biochemical, transcriptomic and proteomic approaches to delineate the role of human HDLBP/vigilin. PAR-CLIP analysis revealed that HDLBP directly and specifically interacted with more than 80% of all expressed ER-localized mRNAs. Interestingly, the binding to the coding sequence was most prominent for ER-localized mRNAs, while cytosolic mRNAs showed higher binding in the 3’UTR. HDLBP crosslinked strongly to long CU-rich motifs that resided more frequently in coding sequences of ER-localized but not in cytosolic mRNAs. This indicated that the primary sequence composition determines the basis for HDLBP binding specificity and its multivalent interactions with ER-bound mRNAs. PAR-CLIP analysis also revealed direct interactions of HDLBP with the RNA components of the translational apparatus, while in vivo proximity proteomics detected proteins involved in translation and components of the signal recognition particle (SRP). Functional studies using CRISPR-Cas9 HDLBP knockout cell lines in combination with ribosome profiling, pSILAC, and luciferase assays showed decreased translation efficiency of HDLBP target mRNAs, impaired protein synthesis and secretion in the knockout conditions. Finally, HDLBP absence resulted in decrease of in vivo lung tumor formation. These results highlight a general function for HDLBP in the translation of ER -localized mRNAs via the secretory pathway and discover its relevance for cell proliferation and tumor progression.
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| Overall design |
RNA-seq of xenograft tumors from A549 HDLBP KO and WT cells.
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| Contributor(s) |
Zinnall U, Milek M, Vieira e Vieira CH, Müller S, Hazapis O, Hüttelmaier S, Selbach M, Landthaler M |
| Citation(s) |
35585045 |
| |
| Submission date |
May 15, 2020 |
| Last update date |
May 26, 2022 |
| Contact name |
Katharina Schmidt-Bleek |
| E-mail(s) |
katharina.schmidt-bleek@bih-charite.de
|
| Organization name |
Charité - Universitätsmedizin Berlin
|
| Department |
Julius Wolff Institute of Biomechanics and Musculoskeletal Regeneration
|
| Street address |
Augustenburger Platz 1
|
| City |
Berlin |
| ZIP/Postal code |
13353 |
| Country |
Germany |
| |
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| Platforms (1) |
| GPL20301 |
Illumina HiSeq 4000 (Homo sapiens) |
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| Samples (18)
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| This SubSeries is part of SuperSeries: |
| GSE148262 |
HDLBP binds ER-targeted mRNAs by multivalent interactions to promote protein synthesis of transmembrane and secreted proteins |
|
| Relations |
| BioProject |
PRJNA633162 |
| SRA |
SRP261899 |
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