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In this study, a transposon-mediated random-mutant library of <jats:italic>C. sakazakii<\/jats:italic> was used to identify new virulence factors. Compared to wild-type bacteria, a mutant lacking CSK29544_02616 (referred to as <jats:italic>labp<\/jats:italic>) was defective in invasion into intestinal epithelial cells (by at least 1000-fold) and showed less phagocytosis by macrophages (by at least 50-fold). The lack of <jats:italic>labp<\/jats:italic> in <jats:italic>C. sakazakii<\/jats:italic> changed the profile of outer membrane proteins, decreased the production of lipopolysaccharides, and increased the production of membrane phospholipids. Bacterial physiological characteristics including surface hydrophobicity and motility were also altered in the absence of <jats:italic>labp<\/jats:italic>, presumably because of changes in the bacterial-envelope structure. To systematically determine the role of <jats:italic>labp<\/jats:italic>, ligand fishing was conducted using Labp as a bait, which revealed LpxA as a binding partner of Labp. LpxA is UDP-<jats:italic>N<\/jats:italic>-acetylglucosamine (GlcNAc) acyltransferase, the first enzyme in the pathway of lipid A biosynthesis. Labp increased the enzymatic activity of LpxA without influencing <jats:italic>lpxA<\/jats:italic> expression. Considering multifaceted roles of lipopolysaccharides in virulence regulation, Labp is a novel virulence factor that promotes the production of lipid A by LpxA in <jats:italic>Cronobacter<\/jats:italic>.<\/jats:p>","DOI":"10.1038\/s41598-018-19306-0","type":"journal-article","created":{"date-parts":[[2018,1,10]],"date-time":"2018-01-10T11:59:51Z","timestamp":1515585591000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["New virulence factor CSK29544_02616 as LpxA binding partner in Cronobacter sakazakii"],"prefix":"10.1038","volume":"8","author":[{"given":"Seongok","family":"Kim","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hyunjin","family":"Yoon","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sangryeol","family":"Ryu","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2018,1,16]]},"reference":[{"key":"19306_CR1","doi-asserted-by":"publisher","first-page":"996","DOI":"10.1086\/501019","volume":"42","author":"D Drudy","year":"2006","unstructured":"Drudy, D., Mullane, N. 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