Manganese-induced turnover of TMEM165
(2017) Biochemical Journal — Vol. 474, p. 1481-1493 (2017)
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- TMEM165 deficiencies lead to one of the Congenital Disorders of Glycosylation (CDG), a group of inherited diseases where the glycosylation process is altered. We recently demonstrated that the Golgi glycosylation defect due to TMEM165 deficiency resulted from Golgi manganese homeostasis defect and that Mn2+ supplementation was sufficient to rescue normal glycosylation. In this paper we highlight TMEM165 as a novel Golgi protein sensitive to manganese. When cells were exposed to high Mn2+ concentrations, TMEM165 was degraded in lysosomes. Remarkably, while the variant R126H was sensitive upon manganese exposure, the variant E108G recently identified in a novel TMEM165-CDG patient, was found to be insensitive. We also showed that the E108G mutation did not abolish the function of TMEM165 in Golgi glycosylation. Altogether this study identified the Golgi protein TMEM165 as a novel Mn2+ sensitive protein in mammalian cells and pointed to the crucial importance of the glutamic acid (E108) in the cytosolic ELGDK motif in Mn2+ induced degradation of TMEM165.
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Potelle, S., Dulary, E., Climer, L., Duvet, S., Morelle, W., Vicogne, D., Lebredonchel, E., Houdou, M., Spriet, C., Krzewinski-Recchi, M.-A., Peanne, R., Klein, A., de Bettignies, G., Morsomme, P., Matthijs, G., Marquardt, T., Lupashin, V., & Foulquier, F. (2017). Manganese-induced turnover of TMEM165. Biochemical Journal, 474, 1481-1493. https://doi.org/10.1042/BCJ20160910 (Original work published 2017)