LINC01554 and infection: Importantly, several factors that had not been previously characterized in Yersinia infection models, including YPK_2594, which has no predicted function, YPK_1920, which is predicted to encode a lipoprotein, YPK_3765, which is predicted to encode a murein peptide ligase, and the dusB-fis operon, which encodes the nucleoid associated protein Fis, were critical for infection.