Polysaccharide-binding protein present at the surface of the cell. Probably mediates xyloglucan-binding before xyloglucan transport in the periplasm for degradation. Glucan metabolism; xyloglucan degradation. Cell outer membrane localization is predicted by analogy with the archetypal sus locus. Gut bacteria supply the human body with energy from dietary polysaccharides through glycosidases that are absent in the human genome. Xyloglucans are a ubiquitous family of highly branched plant cell wall polysaccharides present in the vegetables we consume. Enzymes involved in xyloglucan degradation mediate the conversion of otherwise indigestible plant polysaccharides to short-chain fatty acids (PubMed:24463512).