| Endo-polygalacturonase | |||||||||
|---|---|---|---|---|---|---|---|---|---|
 Computer generated image of Polygalacturonase as found in Aspergillus aculeatus (1IA5) at pH 8.5[1] | |||||||||
| Identifiers | |||||||||
| EC no. | 3.2.1.15 | ||||||||
| CAS no. | 9032-75-1 | ||||||||
| Databases | |||||||||
| IntEnz | IntEnz view | ||||||||
| BRENDA | BRENDA entry | ||||||||
| ExPASy | NiceZyme view | ||||||||
| KEGG | KEGG entry | ||||||||
| MetaCyc | metabolic pathway | ||||||||
| PRIAM | profile | ||||||||
| PDB structures | RCSB PDB PDBe PDBsum | ||||||||
| |||||||||
Endo-polygalacturonase (EC 3.2.1.15, pectin depolymerase, pectolase, pectin hydrolase, and poly-α-1,4-galacturonide glycanohydrolase; systematic name (1→4)-α-D-galacturonan glycanohydrolase (endo-cleaving)) is an enzyme that hydrolyzes the α-1,4 glycosidic bonds between galacturonic acid residues:
- (1,4-α-D-galacturonosyl)n+m + H2O = (1,4-α-D-galacturonosyl)n + (1,4-α-D-galacturonosyl)m
Polygalacturonan, whose major component is galacturonic acid,[2] is a significant carbohydrate component of the pectin network that comprises plant cell walls.[3] Therefore, the activity of the endogenous plant PGs works to soften and sweeten fruit during the ripening process. Similarly, phytopathogens use PGs as a means to weaken the pectin network, so that digestive enzymes can be excreted into the plant host to acquire nutrients.
- ^ Cho SW, Lee S, Shin W (August 2001). "The X-ray structure of Aspergillus aculeatus polygalacturonase and a modeled structure of the polygalacturonase-octagalacturonate complex". Journal of Molecular Biology. 311 (4): 863–78. doi:10.1006/jmbi.2001.4919. PMID 11518536.
- ^ "Medical Definition of Polygalacturonan". Lexic.us.
- ^ Jones, T. M., Anderson, A. J., and Albersheim, P. (1972) Host–pathogen interactions IV, Studies on the polysaccharide-degrading enzymes secreted by Fusarium oxysporum f. sp. lycopersici, Physiol. Plant Pathol. 2, 153-166.