alpha-D-Galactosyl-(1->3)-1D-myo-inositol
Galactinol belongs to the class of organic compounds known as O-glycosyl compounds. These are glycoside in which a sugar group is bonded through one carbon to another group via an O-glycosidic bond. Galactinol is an extremely weak basic (essentially neutral) compound (based on its pKa). Galactinol is an intermediate in galactose metabolism. Galactinol is the fourth-to-last step in the synthesis of D-galactose and the third-to-last step in the synthesis of D-glucose and D-fructose. Galactinol is converted from UDP-galactose via the enzyme inositol 3-alpha-galactosyltransferase (EC 2.4.1.123). It is then converted into raffinose via the enzyme raffinose synthase (EC 2.4.1.82).
| ID | EC Number | Name |
|---|---|---|
| KEGG:R01192 | 2.4.1.123 | UDP-alpha-D-galactose:myo-inositol 3-alpha-D-galactosyltransferase; |
| KEGG:R01194 | 3.2.1.22 | 3-O-alpha-D-galactosyl-1D-myo-inositol galactohydrolase; |
| KEGG:R02411 | 2.4.1.82 | 1-alpha-D-galactosyl-myo-inositol:sucrose 6-alpha-D-galactosyltransferase |
| KEGG:R03418 | 2.4.1.67 | 1-alpha-D-galactosyl-myo-inositol:raffinose galactosyltransferase |
| Rhea:RHEA:12465 | 2.4.1.123 | myo-inositol + UDP-α-D-galactose => α-D-galactosyl-(1→3)-1D-myo-inositol + UDP + H+ |
| Rhea:RHEA:12466 | 2.4.1.123 | α-D-galactosyl-(1→3)-1D-myo-inositol + UDP + H+ => myo-inositol + UDP-α-D-galactose |
| Rhea:RHEA:12467 | 2.4.1.123 | myo-inositol + UDP-α-D-galactose <=> α-D-galactosyl-(1→3)-1D-myo-inositol + UDP + H+ |
| Rhea:RHEA:20162 | 2.4.1.82 | α-D-galactosyl-(1→3)-1D-myo-inositol + sucrose => raffinose + myo-inositol |
| Rhea:RHEA:20163 | 2.4.1.82 | raffinose + myo-inositol => α-D-galactosyl-(1→3)-1D-myo-inositol + sucrose |
| Rhea:RHEA:20164 | 2.4.1.82 | α-D-galactosyl-(1→3)-1D-myo-inositol + sucrose <=> raffinose + myo-inositol |
| Rhea:RHEA:20777 | 2.4.1.67 | α-D-galactosyl-(1→3)-1D-myo-inositol + raffinose => stachyose + myo-inositol |
| Rhea:RHEA:20778 | 2.4.1.67 | stachyose + myo-inositol => α-D-galactosyl-(1→3)-1D-myo-inositol + raffinose |
| Rhea:RHEA:20779 | 2.4.1.67 | α-D-galactosyl-(1→3)-1D-myo-inositol + raffinose <=> stachyose + myo-inositol |
| BioCyc:2.4.1.67-RXN | 2.4.1.67 | CPD-458 + CPD-1099<=>MYO-INOSITOL + CPD-170 |
| BioCyc:RXN-8279 | 2.4.1.- | CPD-8047 + CPD-458 --> CPD-8049 + MYO-INOSITOL |
| BioCyc:RXN-8433 | 2.4.2.- | MELIBIOSE + CPD-458<=>CPD-8249 + MYO-INOSITOL |
| BioCyc:RXN-8284 | 2.4.1.- | CPD-170 + CPD-458 --> CPD-8065 + MYO-INOSITOL |
| BioCyc:2.4.1.123-RXN | 2.4.1.123 | CPD-14553 + MYO-INOSITOL --> PROTON + CPD-458 + UDP |
| BioCyc:RXN-8281 | 2.4.1.- | 4-METHYL-MYO-INOSITOL + CPD-458 --> CPD-8058 + MYO-INOSITOL |
| BioCyc:RXN-8277 | 2.4.1.- | CPD-8046 + CPD-458 --> CPD-8047 + MYO-INOSITOL |
| BioCyc:2.4.1.82-RXN | 2.4.1.82 | CPD-458 + SUCROSE --> MYO-INOSITOL + CPD-1099 |
| BioCyc:RXN-8288 | 2.4.1.- | CPD-8065 + CPD-458 --> CPD-8066 + MYO-INOSITOL |
| BioCyc:RXN-8278 | 2.4.1.- | CPD-8046 + CPD-458 --> CPD-8048 + MYO-INOSITOL |
| BioCyc:RXN-8292 | 2.4.1.- | 5-O-METHYL-MYO-INOSITOL + CPD-458<=>CPD-8058 + MYO-INOSITOL |