proteoglycan catabolic process keratan sulfate proteoglycan metabolic process keratan sulfate proteoglycan catabolic process https://github.com/geneontology/go-ontology/issues/28977 https://github.com/geneontology/go-ontology/issues/29745 keratan sulfate breakdown GO:0042340 biological_process keratan sulfate degradation keratan sulfate catabolism The chemical reactions and pathways resulting in the breakdown of keratan sulfate proteoglycans, which consist of a core protein linked to a keratan sulfate glycosaminoglycan. The keratan sulfate chain is composed of the repeating disaccharide unit beta-(1,4)-N-acetyl-D-glucosamine-beta-(1,3)-galactose, both of which can be sulfated. keratan sulphate catabolic process keratan sulphate catabolism Reactome:R-HSA-2022857