caution:It is uncertain whether Met-1 or Met-32 is the initiator.,function:Mannosyltransferase involved in glycosylphosphatidylinositol-anchor biosynthesis. Transfers a fourth mannose to some trimannosyl-GPIs during GPI precursor assembly. The presence of a fourth mannose in GPI is facultative and only scarcely detected, suggesting that it only exists in some tissues.,pathway:Glycolipid biosynthesis; glycosylphosphatidylinositol-anchor biosynthesis.,similarity:Belongs to the glycosyltransferase 22 family. PIGZ subfamily.,tissue specificity:Widely expressed at low level, with highest level in brain and colon.,
Endoplasmic reticulum membrane ; Multi-pass membrane protein .
Widely expressed at low level, with highest level in brain and colon.
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