Orientations of the Bacteroides fragilis Capsular Polysaccharide Biosynthesis Locus Promoters during Symbiosis and Infection▿ †

摘要

Orientations of the seven invertible polysaccharide biosynthesis locus promoters of Bacteroidesfragilis were determined from bacteria grown in vitro, from feces of monoassociated and complex colonized mice, and from B. fragilis-induced murine abscesses. Bacteria grown in vivo have greater variability in orientation of polysaccharide locus promoters than culture-grown organisms.