Deleting tonB4 and tonB6 in B. thetaiotaomicron
Complex carbohydrates are composed of diverse monosaccharide subunits and various glycosidic linkages; a plethora of substrate-specific enzymes are needed to digest them for primary metabolism. A unique feature of the Bacteroidetes genome is the presence of polysaccharide utilization loci (PULs)...