Article ; Online: Reduced DNAJC3 Expression Affects Protein Translocation across the ER Membrane and Attenuates the Down-Modulating Effect of the Translocation Inhibitor Cyclotriazadisulfonamide.
International journal of molecular sciences
2022 Volume 23, Issue 2
Abstract: One of the reported substrates for the endoplasmic reticulum (ER) translocation inhibitor cyclotriazadisulfonamide (CADA) is DNAJC3, a chaperone of the unfolded protein response during ER stress. In this study, we investigated the impact of altered ... ...
| Abstract | One of the reported substrates for the endoplasmic reticulum (ER) translocation inhibitor cyclotriazadisulfonamide (CADA) is DNAJC3, a chaperone of the unfolded protein response during ER stress. In this study, we investigated the impact of altered DNAJC3 protein levels on the inhibitory activity of CADA. By comparing WT DNAJC3 with a CADA-resistant DNAJC3 mutant, we observed the enhanced sensitivity of human CD4, PTK7 and ERLEC1 for CADA when DNAJC3 was expressed at high levels. Combined treatment of CADA with a proteasome inhibitor resulted in synergistic inhibition of protein translocation and in the rescue of a small preprotein fraction, which presumably corresponds to the CADA affected protein fraction that is stalled at the Sec61 translocon. We demonstrate that DNAJC3 enhances the protein translation of a reporter protein that is expressed downstream of the CADA-stalled substrate, suggesting that DNAJC3 promotes the clearance of the clogged translocon. We propose a model in which a reduced DNAJC3 level by CADA slows down the clearance of CADA-stalled substrates. This results in higher residual translocation into the ER lumen due to the longer dwelling time of the temporarily stalled substrates in the translocon. Thus, by directly reducing DNAJC3 protein levels, CADA attenuates its net down-modulating effect on its substrates. |
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| MeSH term(s) | Endoplasmic Reticulum/metabolism ; Endoplasmic Reticulum Stress ; HEK293 Cells ; HSP40 Heat-Shock Proteins/metabolism ; Humans ; Protein Transport ; SEC Translocation Channels/metabolism ; Unfolded Protein Response |
| Chemical Substances | DNAJC3 protein, human ; HSP40 Heat-Shock Proteins ; SEC Translocation Channels |
| Language | English |
| Publishing date | 2022-01-06 |
| Publishing country | Switzerland |
| Document type | Journal Article |
| ZDB-ID | 2019364-6 |
| ISSN | 1422-0067 ; 1422-0067 ; 1661-6596 |
| ISSN (online) | 1422-0067 |
| ISSN | 1422-0067 ; 1661-6596 |
| DOI | 10.3390/ijms23020584 |
| Database | MEDical Literature Analysis and Retrieval System OnLINE |
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