Carbohydrate sulfotransferase 1 (CHST1) is a Golgi-localized, membrane-bound enzyme that transfers a sulfate group from 3'-phosphoadenosine-5'-phosphosulfate (PAPS) to the 6-position of internal galactose residues on keratan sulfate chains, contributing to the biosynthesis and elongation of keratan sulfate proteoglycans in tissues such as cornea and brain. Its enzymatic activity influences extracellular matrix properties, cellular adhesion, and signaling, and it is implicated in connective tissue disorders and certain cancers, where altered expression serves as a potential disease marker.
Not applicable; as above, no targeted drugs known. Theoretical: inhibitors would block 6-O-sulfation of galactose, altering glycan-mediated cell interactions.
03
Biological functions
Catalyzes sulfation of internal galactose residues of keratan sulfate and related glycoconjugatesBiosynthesis and elongation of keratan sulfate (a glycosaminoglycan in proteoglycans)Construction of O-linked glycans with 6-sulfoGalbeta motifsParticipates in formation of extracellular matrix proteoglycans important for cell communication, especially in brain development and lymph node high endothelial venulesContributes to immune cell trafficking through the biosynthesis of specific glycan motifs
04
Disease associations
Connective tissue disorders, especially macular corneal dystrophyCancer (overexpression linked to tumor progression, diagnostic and prognostic marker in malignancies)Inflammation (involved in leukocyte trafficking and tissue remodeling)
05
Safety considerations
Inhibition could disrupt normal keratan sulfate biosynthesis, potentially leading to corneal and cartilage pathologyChallenge: Substrate overlap among sulfotransferases may cause off-target effects if enzymes are pharmacologically inhibited
06
Interacting drugs
No specific drugs directly target CHST1 identified in current literature or standard pharmacological databases. Glycosaminoglycan pathway inhibitors may have indirect effect, but no direct clinical agent is currently known.
07
Biomarkers
Increased tissue/cellular expression used as diagnostic/prognostic biomarker in certain cancers and connective tissue disorders (not widely established as clinical biomarker)
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