期刊
ADVANCED SCIENCE
卷 9, 期 16, 页码 -出版社
WILEY
DOI: 10.1002/advs.202105391
关键词
intracellular trafficking; RAB proteins; RNF115; signaling transduction; Toll-like receptors; ubiquitination
资金
- National Key Research and Development Program of China [2018TFE0204500, 2018YFC1004601]
- Natural Science Foundation of China [31930040, 32070900, 32000636]
- National Natural Science Foundation of Hubei Province [2020CFA015]
- Fundamental Research Funds for Central Universities [2042020kf0207, 2042020kf0042]
- Medical Science Advancement Program (Basic Medical Sciences) of Wuhan University [TFJC2018004]
- Non-Profit Central Research Institute Fund of Chinese Academy of Medical Sciences [2020-PT320-004]
This study demonstrates that the E3 ubiquitin ligase RNF115 inhibits the post-ER trafficking of Toll-like receptors (TLRs) by catalyzing the ubiquitination of RAB1A and RAB13. The chaperones 14-3-3 bind to phosphorylated RNF115 and facilitate its localization on the ER and Golgi apparatus. This finding provides insights into the regulatory mechanism of TLRs' post-ER trafficking.
The subcellular localization and intracellular trafficking of Toll-like receptors (TLRs) critically regulate TLRs-mediated antimicrobial immunity and autoimmunity. Here, it is demonstrated that the E3 ubiquitin ligase RNF115 inhibits the post-endoplasmic reticulum (ER) trafficking of TLRs and TLRs-mediated immune responses by catalyzing ubiquitination of the small GTPases RAB1A and RAB13. It is shown that the 14-3-3 chaperones bind to AKT1-phosphorylated RNF115 and facilitate RNF115 localizing on the ER and the Golgi apparatus. RNF115 interacts with RAB1A and RAB13 and catalyzes K11-linked ubiquitination on the Lys49 and Lys61 residues of RAB1A and on the Lys46 and Lys58 residues of RAB13, respectively. Such a modification impairs the recruitment of guanosine diphosphate (GDP) dissociation inhibitor 1 (GDI1) to RAB1A and RAB13, a prerequisite for the reactivation of RAB proteins. Consistently, knockdown of RAB1A and RAB13 in Rnf115(+/+) and Rnf115(-/-) cells markedly inhibits the post-ER and the post-Golgi trafficking of TLRs, respectively. In addition, reconstitution of RAB1A(K49/61R) or RAB13(K46/58R) into Rnf115(+/+) cells but not Rnf115(-/-) cells promotes the trafficking of TLRs from the ER to the Golgi apparatus and from the Golgi apparatus to the cell surface, respectively. These findings uncover a common and step-wise regulatory mechanism for the post-ER trafficking of TLRs.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据