Elimination of a signal sequence-uncleaved form of defective HLA protein through BAG6
| Autor: | Kanji Suzuki, Aya Noguchi, Mizuki Hayashishita, Koki Yamamoto, Takumi Hagiwara, Setsuya Minami, Hiroyuki Kawahara |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
0301 basic medicine
Signal peptide Proteasome Endopeptidase Complex lcsh:Medicine Human leukocyte antigen Protein Sorting Signals Article 03 medical and health sciences Humans lcsh:Science Degradation pathway Genetics Multidisciplinary HLA-A Antigens Chemistry Endoplasmic reticulum lcsh:R Cell biology Transmembrane domain 030104 developmental biology Proteasome Cytoplasm Solubilization lcsh:Q HeLa Cells Molecular Chaperones |
| Zdroj: | Scientific Reports Scientific Reports, Vol 7, Iss 1, Pp 1-13 (2017) |
| ISSN: | 2045-2322 |
| Popis: | A portion of newly synthesized transmembrane domain proteins tend to fail to assemble correctly in the lumen of the endoplasmic reticulum, thus resulting in the production of a signal sequence-uncleaved form of the defective species. Although the efficient degradation of these mistargeted polypeptides is crucial, the molecular mechanism of their elimination pathway has not been adequately characterized. In this study, we focused on one such cryptic portion of a defective transmembrane domain protein, HLA-A, and show that a part of HLA-A is produced as a signal sequence-uncleaved labile species that is immediately targeted to the degradation pathway. We found that both BAG6 and proteasomes are indispensable for elimination of mislocalized HLA-A species. Furthermore, defective HLA-A is subjected to BAG6-dependent solubilization in the cytoplasm. These observations suggest that BAG6 acts as a critical factor for proteasome-mediated degradation of mislocalized HLA-A with a non-cleaved signal sequence at its N-terminus. |
| Databáze: | OpenAIRE |
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