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Information on EC - crocetin dialdehyde synthase

for references in articles please use BRENDA:EC1.13.11.84
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EC Tree
IUBMB Comments
The enzyme, characterized from the plant Crocus sativus (saffron), acts twice, cleaving 3beta-hydroxy-beta-cyclocitral off each 3-hydroxy end group. It is part of the zeaxanthin degradation pathway in that plant, leading to the different compounds that impart the color, flavor and aroma of the saffron spice. The enzyme can similarly cleave the 7-8 double bond of other carotenoids with a 3-hydroxy-beta-carotenoid end group.
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Word Map
The expected taxonomic range for this enzyme is: Eukaryota, Bacteria
Reaction Schemes
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carotenoid cleavage dioxygenase 2, zeaxanthin 7,8(7',8')-cleavage dioxygenase, more
3beta-hydroxy-8'-apo-beta-carotenal + O2 = crocetin dialdehyde + 3beta-hydroxy-beta-cyclocitral
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zeaxanthin + 2 O2 = crocetin dialdehyde + 2 3beta-hydroxy-beta-cyclocitral
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overall reaction
zeaxanthin + O2 = 3beta-hydroxy-8'-apo-beta-carotenal + 3beta-hydroxy-beta-cyclocitral
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