ExplorEnz: EC 5.3.99.8

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5.3.99.8

Accepted name:

capsanthin/capsorubin synthase

Reaction:

(1) violaxanthin = capsorubin
(2) antheraxanthin = capsanthin

For diagram of the biosynthesis of capsanthin, capsarubin and neoxanthin, click here and for diagram of carotenoid epoxide rearrangements, click here

Other name(s):

CCS; ketoxanthophyll synthase; capsanthin-capsorubin synthase

Systematic name:

violaxanthin—capsorubin isomerase (ketone-forming)

Comments:

This multifunctional enzyme is induced during chromoplast differentiation in plants [1]. Isomerization of the epoxide ring of violaxanthin gives the cyclopentyl-ketone of capsorubin or capsanthin.

Links to other databases:

BRENDA, EXPASY, KEGG, MetaCyc, CAS registry number: 162032-85-1

References:

1.	Bouvier, F., Hugueney, P., d'Harlingue, A., Kuntz, M. and Camara, B. Xanthophyll biosynthesis in chromoplasts: isolation and molecular cloning of an enzyme catalyzing the conversion of 5,6-epoxycarotenoid into ketocarotenoid. Plant J. 6 (1994) 45–54. [DOI] [PMID: 7920703]
2.	Lefebvre, V., Kuntz, M., Camara, B. and Palloix, A. The capsanthin-capsorubin synthase gene: a candidate gene for the y locus controlling the red fruit colour in pepper. Plant Mol. Biol. 36 (1998) 785–789. [PMID: 9526511]
3.	Xu, C.J., Chen, D.M. and Zhang, S.L. [Molecular cloning of full length capsanthin/capsorubin synthase homologous gene from orange (Citrus sinensis)] Shi Yan Sheng Wu Xue Bao 34 (2001) 147–150. [PMID: 12549109] (in Chinese)

[EC 5.3.99.8 created 2005]