EC |
2.7.1.228 |
Accepted name: |
mannosyl-inositol-phosphoceramide inositolphosphotransferase |
Reaction: |
1-phosphatidyl-1D-myo-inositol + a (4R)-4-hydroxy-N-[(2R)-2-hydroxy-very-long-chain-acyl]-1-O-{[6-O-(α-D-mannosyl)-1D-myo-inositol-1-O-yl]hydroxyphosphoryl}sphinganine = 1,2-diacyl-sn-glycerol + a (4R)-4-hydroxy-N-[(2R)-2-hydroxy-very-long-chain-acyl]-1-O-[(6-O-{6-O-[(1D-myo-inositol-1-O-yl)hydroxyphosphoryl]-α-D-mannosyl}-1D-myo-inositol-1-O-yl)hydroxyphosphoryl]sphinganine |
Glossary: |
a (4R)-4-hydroxy-N-[(2R)-2-hydroxy-very-long-chain-acyl]-1-O-{[6-O-(α-D-mannosyl)-1D-myo-inositol-1-O-yl]hydroxyphosphoryl}sphinganine = a very-long-chain mannosylinositol phospho-α-hydroxyphytoceramide = MIPC
a (4R)-4-hydroxy-N-[(2R)-2-hydroxy-very-long-chain-acyl]-1-O-[(6-O-{6-O-[(1D-myo-inositol-1-O-yl)hydroxyphosphoryl]-α-D-mannosyl}-1D-myo-inositol-1-O-yl)hydroxyphosphoryl]sphinganine = a very-long-chain mannosyl-diphosphoinositol-α-hydroxyphytoceramide = MIP2C |
Other name(s): |
IPT1 (gene name) |
Systematic name: |
1-phosphatidyl-1D-myo-inositol:(4R)-4-hydroxy-N-[(2R)-2-hydroxy-very-long-chain-acyl]-1-O-{[6-O-(α-D-mannosyl)-1D-myo-inositol-1-O-yl]hydroxyphosphoryl}sphinganine phosphoinositoltransferase |
Comments: |
This enzyme catalyses the ultimate reaction in the yeast sphingolipid biosynthesis pathway. It transfers a second phosphoinositol group to mannosyl-inositol-phospho-α-hydroxyphytoceramide (MIPC), forming the final and most abundant yeast sphingolipid, mannosyl-diphosphoinositol-ceramide (MIP2C). |
References: |
1. |
Dickson, R.C., Nagiec, E.E., Wells, G.B., Nagiec, M.M. and Lester, R.L. Synthesis of mannose-(inositol-P)2-ceramide, the major sphingolipid in Saccharomyces cerevisiae, requires the IPT1 (YDR072c) gene. J. Biol. Chem. 272 (1997) 29620–29625. [PMID: 9368028] |
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[EC 2.7.1.228 created 2019] |
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