4group이 있다.
Heparin/heparan sulfate
chondroitin sulfate/dermatan sulfate
Keratan sulfate
hyaluronic acid
GAGs are classified into four groups based on core disaccharide structures.[5] Heparin/heparan sulfate (HSGAGs) and chondroitin sulfate/dermatan sulfate (CSGAGs) are synthesized in the Golgi apparatus, where protein cores made in the rough endoplasmic reticulum are post-translationally modified with O-linked glycosylations by glycosyltransferases forming proteoglycans. Keratan sulfate may modify core proteins through N-linked glycosylation or O-linked glycosylation of the proteoglycan. The fourth class of GAG, hyaluronic acid is synthesized by integral membrane synthases which immediately secrete the dynamically elongated disaccharide chain.
(참조) https://en.wikipedia.org/wiki/Glycosaminoglycan
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