:Carotene epsilon-monooxygenase

{{Infobox enzyme

| Name = Carotene epsilon-monooxygenase

| EC_number = 1.14.99.45

| CAS_number =

| GO_code =

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Carotene epsilon-monooxygenase ({{EC number|1.14.99.45}}, CYP97C1, LUT1) is an enzyme with systematic name alpha-carotene:oxygen oxidoreductase (3-hydroxylating).{{cite journal | vauthors = Pogson B, McDonald KA, Truong M, Britton G, DellaPenna D | title = Arabidopsis carotenoid mutants demonstrate that lutein is not essential for photosynthesis in higher plants | journal = The Plant Cell | volume = 8 | issue = 9 | pages = 1627–39 | date = September 1996 | pmid = 8837513 | pmc = 161303 | doi = 10.1105/tpc.8.9.1627 }}{{cite journal | vauthors = Tian L, Musetti V, Kim J, Magallanes-Lundback M, DellaPenna D | title = The Arabidopsis LUT1 locus encodes a member of the cytochrome p450 family that is required for carotenoid epsilon-ring hydroxylation activity | journal = Proceedings of the National Academy of Sciences of the United States of America | volume = 101 | issue = 1 | pages = 402–7 | date = January 2004 | pmid = 14709673 | pmc = 314197 | doi = 10.1073/pnas.2237237100 | bibcode = 2004PNAS..101..402T | doi-access = free }} This enzyme catalyses the following chemical reaction

: alpha-carotene + O₂ + AH₂ $\backslash rightleftharpoons$ alpha-cryptoxanthin + A + H₂O

Carotene epsilon-monooxygenase is a heme-thiolate protein (P450)..