Polygalacturonase in pollen from corn and other grasses
1989
Pressey, Russell | Reger, Bonnie J.
Polygalacturonase was found in pollen of the twelve monocotyledon species examined. The amount of polygalacturonase ranged from 6.3 units/g in lily to 201 units/g in Johnsongrass. The C4 species contained much more polygalacturonase than the C3 species. The enzyme in corn (Zea mays L.) pollen was partially purified and characterized. It was optimally active at pH 5.3 and required Ca2+ for activity, with an optimum concentration of 0.5 mM. The enzyme was most effective on galacturonans with moderate chain lengths. It released monomeric units from the non-reducing ends of the substrate chains, and thus can be classified as an exopolygalaturonase. The polygalacturonase in the other grass pollens appeared to be similar to that in corn pollen.
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