1beta-glutathionylseleno-N-acetyl-D-galactosamine (GSSebGalNac) aka selenosugar A is converted into 1beta-methylseleno-N-acetyl-D-galactosamine (MeSebGalNac) aka selenosugar B by an unknown mechanism. The actual enzyme or enzymes involved have yet to be identified. This reaction is inferred from the event in rat (Kobayashi et al. 2002).
Kobayashi, Y, Ogra, Y, Ishiwata, K, Takayama, H, Aimi, N, Suzuki, KT
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