Capsanthin/capsorubin synthase

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Capsanthin/capsorubin synthase (EC 5.3.99.8, CCS, ketoxanthophyll synthase, capsanthin-capsorubin synthase) is an enzyme with systematic name violaxanthin—capsorubin isomerase (ketone-forming).^[1]^[2]^[3] This enzyme catalyses the following chemical reaction

(1) violaxanthin

\rightleftharpoons

capsorubin

(2) antheraxanthin

\rightleftharpoons

capsanthin

This multifunctional enzyme is induced during chromoplast differentiation in plants.

References

↑ Bouvier F, Hugueney P, d'Harlingue A, Kuntz M, Camara B (1994). "Xanthophyll biosynthesis in chromoplasts: isolation and molecular cloning of an enzyme catalyzing the conversion of 5,6-epoxycarotenoid into ketocarotenoid". Plant J. 6: 45–54. doi:10.1046/j.1365-313x.1994.6010045.x. PMID 7920703.
↑ Lefebvre V, Kuntz M, Camara B, Palloix A (1998). "The capsanthin-capsorubin synthase gene: a candidate gene for the y locus controlling the red fruit colour in pepper". Plant Mol. Biol. 36: 785–789. doi:10.1023/A:1005966313415. PMID 9526511.
↑ Xu CJ, Chen DM, Zhang SL (2001). "[Molecular cloning of full length capsanthin/capsorubin synthase homologous gene from orange (Citrus sinensis)]". Shi Yan Sheng Wu Xue Bao 34: 147–150. PMID 12549109.

External links

Capsanthin/capsorubin synthase at the US National Library of Medicine Medical Subject Headings (MeSH)

Isomerases: intramolecular oxidoreductases (EC 5.3)

5.3.1: Aldoses/Ketoses	Triosephosphate isomerase Ribose-5-phosphate isomerase Mannose phosphate isomerase Glucose isomerase

5.3.2: Keto/Enol	Phenylpyruvate tautomerase Oxaloacetate tautomerase

5.3.3: C = C	Steroid D-isomerase Isopentenyl-diphosphate delta isomerase Vinylacetyl-CoA D-isomerase Muconolactone D-isomerase Cholestenol Delta-isomerase (EBP) Methylitaconate D-isomerase Aconitate Delta-isomerase Enoyl CoA isomerase Prostaglandin-A1 Delta-isomerase 5-carboxymethyl-2-hydroxymuconate D-isomerase Isopiperitenone D-isomerase L-dopachrome isomerase Polyenoic fatty acid isomerase

5.3.4: S-S	Protein disulfide-isomerase (PDIA3)

5.3.99: other	Prostaglandin D2 synthase/Prostaglandin-D synthase Prostaglandin E synthase Prostacyclin synthase Thromboxane-A synthase

Enzymes

Activity	Active site Binding site Catalytic triad Oxyanion hole Enzyme promiscuity Catalytically perfect enzyme Coenzyme Cofactor Enzyme catalysis Enzyme kinetics Lineweaver–Burk plot Michaelis–Menten kinetics

Regulation	Allosteric regulation Cooperativity Enzyme inhibitor

Classification	EC number Enzyme superfamily Enzyme family List of enzymes

Types	EC1 Oxidoreductases(list) EC2 Transferases(list) EC3 Hydrolases(list) EC4 Lyases(list) EC5 Isomerases(list) EC6 Ligases(list)

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