title: Mutations in the waaR gene of Escherichia coli which disrupt lipopolysaccharide outer core biosynthesis affect cell surface retention of group 2 capsular polysaccharides.
abstract: On the basis of increased resistance to K5 capsule-specific bacteriophage, a waaR transposon mutant defective in the biosynthesis of lipopolysaccharide outer core was isolated. In a K1-expressing strain the mutation equally affected sensitivity to K1 capsule-specific bacteriophage, indicating a general effect on group 2 capsules. The waaR mutation affected retention on the cell surface of the K5 polysaccharide, with increased polysaccharide accumulating in the culture supernatant. This indicates that interactions between the outer core of lipopolysaccharide and group 2 capsular polysaccharides are important for the stabilization of group 2 capsular polysaccharides on the cell surface.
authors.affiliation: Faculty of Life Sciences, 1.800 Stopford Building, University of Manchester, Manchester M13 9PT, United Kingdom.
authors.forename: Clare M
authors.initials: CM
authors.lastname: Taylor
authors.forename: Marie
authors.initials: M
authors.lastname: Goldrick
authors.forename: Liz
authors.initials: L
authors.lastname: Lord
authors.forename: Ian S
authors.initials: IS
authors.lastname: Roberts
mesh_terms: D000954:Antigens, Surface / Q000096:biosynthesis*; D001425:Bacterial Outer Membrane Proteins / Q000378:metabolism; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism* / Q000648:ultrastructure; D029968:Escherichia coli Proteins / Q000235:genetics / Q000378:metabolism*; D015964:Gene Expression Regulation, Bacterial; D008070:Lipopolysaccharides / Q000096:biosynthesis*; D009154:Mutation; D011134:Polysaccharides / Q000378:metabolism*
chemical_list: D000954:Antigens, Surface; D001425:Bacterial Outer Membrane Proteins; D029968:Escherichia coli Proteins; D008070:Lipopolysaccharides; D011134:Polysaccharides