Aminoacyl-tRNA synthetases (ARSs), enzymes that normally control protein synthesis, can be secreted and have different activities in the extracellular space, but the mechanism of their secretion is not understood. This study describes the secretion route of the ARS lysyl-tRNA synthetase (KRS) and how this process is regulated by caspase activity, which has been implicated in the unconventional secretion of other proteins. We show that KRS is secreted from colorectal carcinoma cells within the lumen of exosomes that can trigger an inflammatory response. Caspase-8 cleaved the N-terminal of KRS, thus exposing a PDZ-binding motif located in the C terminus of KRS. Syntenin bound to the exposed PDZ-binding motif of KRS and facilitated the exosomic secretion of KRS dissociated from the multi-tRNA synthetase complex. KRScontaining exosomes released by cancer cells induced macrophage migration, and their secretion of TNF-α and cleaved KRS made a significant contribution to these activities, which suggests a novel mechanism by which caspase-8 may promote inflammation.
Bibliographical noteFunding Information:
We thank Professor Min Guo for BiFC Renilla luciferase plasmid. This work was supported by the Global Frontier Project grants NRF-M3A6A4-2010-0029785 (to S.B. Kim), NRF-M1AXA002-2012M3A6A4054261 (to P. Kim), and NRF-2015M3A6A4065729 (to H.S. Jung) of the National Research Foundation supported by the Ministry of Science, ICT and Future Planning of South Korea.
All Science Journal Classification (ASJC) codes
- Cell Biology