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{{Infobox enzyme
| Name = Zeaxanthin 7,8-dioxygenase
| EC_number = 1.14.99.42
| CAS_number = 
| IUBMB_EC_number = 1/14/99/42
| GO_code = 
| image = 
| width = 
| caption =
}}
'''Zeaxanthin 7,8-dioxygenase''' ({{EC number|1.14.99.42}}, ''zeaxanthin 7,8(7',8')-cleavage dioxygenase'', ''CsZCD'') is an [[enzyme]] with system name ''zeaxanthin:oxygen oxidoreductase (7,8-cleaving)''.<ref>{{cite journal | title = Oxidative remodeling of chromoplast carotenoids: identification of the carotenoid dioxygenase <em>CsCCD</em> and <em>CsZCD</em> genes involved in Crocus secondary metabolite biogenesis |author = Bouvier, F., Suire, C., Mutterer, J. and Camara, B. |journal = Plant Cell |year = 2003 |volume = 15 |pages = 47–62 |pmid = 12509521 |issue=1 |pmc=143450}}</ref> This enzyme [[catalysis|catalyses]] the following [[chemical reaction]]

: [[zeaxanthin]] + 2 O<sub>2</sub> <math>\rightleftharpoons</math> [[crocetin]] [[aldehyde|dialdehyde]] + 2 (3S)-3-hydroxycyclocitral

Zeaxanthin 7,8-dioxygenase acts twice on zeaxanthin cleaving 3-hydroxycyclocitral off each 3-[[Hydroxyl|hydroxy]] end group.

== References ==
{{reflist}}

== External links ==
* {{MeshName|Zeaxanthin+7,8-dioxygenase}}

[[Category:EC 1.14.99]]