SidC is one of the effectors delivered by Legionella pneumophila into the host cell. Like its paralogue SdcA, SidC anchor on the Legionella-containing vacuole (LCV) to facilitate the recruitment of endoplasmic reticulum (ER) proteins. This protein is organised into four domains that are packed into an arch-like shape: the N- terminal SNL domain (Pfam:PF18219), the INS domain (which is inserted within the SNL domain), the P4C domain, and a C-terminal domain. This entry represents the latter, which shows an alpha-helical fold. Its function is unknown [1].

1: Structure of the Legionella Virulence Factor, SidC Reveals a Unique PI(4)P-Specific Binding Domain Essential for Its Targeting to the Bacterial Phagosome. Luo X, Wasilko DJ, Liu Y, Sun J, Wu X, Luo ZQ, Mao Y; PLoS Pathog. 2015;11:e1004965. PMID:26067986