Has pectate lyase activity. Eliminative cleavage of (1->4)-alpha-D-galacturonan to give oligosaccharides with 4-deoxy-alpha-D-galact-4-enuronosyl groups at their non-reducing ends. Binds 1 Ca(2+) ion. Optimum pH is 10. Optimum temperature is 60-70 degrees Celsius. Glycan metabolism; pectin degradation; 2-dehydro-3-deoxy-D-gluconate from pectin: step 2/5. N-glycosylated; contains fucose and xylose. Causes an allergic reaction in human. This is one of the major allergens of Japanese cedar pollen, the most common pollen allergen in Japan. Belongs to the polysaccharide lyase 1 family. Amb a subfamily.