EC Number   |
Substrates |
Organism |
Products |
Reversibility |
|---|
  3.2.1.173 | alpha-D-GalA-[(1->2)-alpha-L-Rha-(1->4)-alpha-D-GalA-]2-(1->2)-alpha-L-Rha + H2O |
- |
Aspergillus aculeatus |
beta-D-GalA + [alpha-L-Rha-(1->4)-alpha-D-GalA-]2-(1->2)-alpha-L-Rha |
- |
? |
| 3.2.1.173 | alpha-D-GalA-[(1->2)-alpha-L-Rha-(1->4)-alpha-D-GalA-]3-(1->2)-alpha-L-Rha + H2O |
- |
Aspergillus aculeatus |
beta-D-GalA + [alpha-L-Rha-(1->4)-alpha-D-GalA-]3-(1->2)-alpha-L-Rha |
- |
? |
| 3.2.1.173 | alpha-D-GalA-[(1->2)-alpha-L-Rha-(1->4)-alpha-D-GalA-]4-(1->2)-alpha-L-Rha + H2O |
- |
Aspergillus aculeatus |
beta-D-GalA + [alpha-L-Rha-(1->4)-alpha-D-GalA-]4-(1->2)-alpha-L-Rha |
- |
? |
| 3.2.1.173 | alpha-D-GalA-[(1->2)-alpha-L-Rha-(1->4)-alpha-D-GalA-]5-(1->2)-alpha-L-Rha + H2O |
- |
Aspergillus aculeatus |
beta-D-GalA + [alpha-L-Rha-(1->4)-alpha-D-GalA-]5-(1->2)-alpha-L-Rha |
- |
? |
| 3.2.1.173 | alpha-D-GalA-[(1->2)-alpha-L-Rha-(1->4)-alpha-D-GalA-]6-(1->2)-alpha-L-Rha + H2O |
- |
Aspergillus aculeatus |
beta-D-GalA + [alpha-L-Rha-(1->4)-alpha-D-GalA-]6-(1->2)-alpha-L-Rha |
- |
? |
| 3.2.1.173 | MHR-S + H2O |
i.e. saponified modified hairy regions of rhamnogalacturonan I, from apple pectin, residue remaining after enzymatic liquefaction of pectin |
Aspergillus aculeatus |
D-galactose + ? |
- |
? |
| 3.2.1.173 | more |
no activity with: CM-cellulose, crystalline cellulose, xylan from oat spelts, soluble starch, potato arabino-beta-(1,4)-galactan, larchwood arabino-beta-(1,3)/(1,6)-galactan (stractan), linear arabinan, polygalacturonic acid with or without 1 mM CaCl2 added, 4-nitrophenyl-alpha-L-Araf, 4-nitrophenyl-alpha-D-Galp, 4-nitrophenyl-beta-D-Galp, 4-nitrophenyl-alpha-D-Xylp, 4-nitrophenyl-beta-D-Xylp, 4-nitrophenyl-alpha-D-Manp, 4-nitrophenylb-D-Manp, 4-nitrophenyl-alpha-L-Fucp, 4-nitrophenyl-beta-D-Fucp, 4-nitrophenyl-alpha-D-Glcp, 4-nitrophenyl-beta-D-Glcp, 4-nitrophenyl-alpha-L-Rhap, 4-nitrophenyl-beta-D-GlcpA, and 4-nitrophenyl-beta-D-GalpA |
Aspergillus aculeatus |
? |
- |
? |
| 3.2.1.173 | more |
RGI endo-hydrolases, RGHs, attack the RGI backbone randomly in an endo-fashion and catalyse bond cleavage of alpha-(1->2) glycosidic bonds between D-GalpA and L-Rhap. The mechanism involves an inversion of the anomeric C1 configuration in galacturonic acid releasing oligosaccharides with beta-D-GalpA at the reducing end and L-Rhap at the non-reducing end as products. The RGGH type of exo-enzyme cleaves off the terminal nonreducing galacturonosyl residue by catalysing cleavage of alpha-(1->2) glycosidic bonds between D-GalpA and L-Rhap in the non-reducing terminus, releasing single beta-D-GalpA. The RGGH from Aspergillus aculeatus is active towards different types of rhamnogalacturonan I (RGI), for example, pectin or pure RGI, except for the ones with unsaturated GalpA at the nonreducing end. The enzyme displays preference for smaller RGI substrates since it has higher activities towards RGI fragment DP6 than saponified modified hairy regions of rhamnogalacturonan I (MHR-S). Aspergillus aculeatus RGGH shows no activity towards HG sub-strates, for example, polygalacturonic acid or small size GalpA acid oligomers |
Aspergillus aculeatus |
? |
- |
? |
| 3.2.1.173 | rhamnogalacturonan I + H2O |
RGI, degrading enzymes are active on the RGI backbone of pectin and are thus strictly specific for cleaving bonds in the repetitive [(1->2)-alpha-L-Rhap-(1->4)-alpha-D-GalpA-(1->2)] structure |
Aspergillus aculeatus |
? |
- |
? |
| 3.2.1.173 | rhamnogalacturonan I + H2O |
RGI DP 6 |
Aspergillus aculeatus |
D-galactose + ? |
- |
? |
