This entry represents OspI, a Shigella flexneri effector encoded by ORF169b that suppresses the TNF-receptor-associated factor 6 (TRAF6)-mediated signalling pathway and inhibits acute inflammatory responses in the initial stage of infection. This is a glutamine deamidase essential for the deamidation of UBC13 [1,2].

1: The Shigella flexneri effector OspI deamidates UBC13 to dampen the inflammatory response. Sanada T, Kim M, Mimuro H, Suzuki M, Ogawa M, Oyama A, Ashida H, Kobayashi T, Koyama T, Nagai S, Shibata Y, Gohda J, Inoue J, Mizushima T, Sasakawa C; Nature. 2012;483:623-626. PMID:22407319

2: Structural basis for the recognition of Ubc13 by the Shigella flexneri effector OspI. Nishide A, Kim M, Takagi K, Himeno A, Sanada T, Sasakawa C, Mizushima T; J Mol Biol. 2013;425:2623-2631. PMID:23542009