The Enzyme Database

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Accepted name: carlactone synthase
Reaction: 9-cis-10′-apo-β-carotenal + 2 O2 = carlactone + (2E,4E,6E)-7-hydroxy-4-methylhepta-2,4,6-trienal
For diagram of strigol biosynthesis, click here
Glossary: carlactone = 3-methyl-5-{[(1Z,3E)-2-methyl-4-(2,6,6-trimethylcyclohex-1-en-1-yl)buta-1,3-dien-1-yl]oxy}-5H-furan-2-one
Other name(s): CCD8 (gene name); MAX4 (gene name); NCED8 (gene name)
Systematic name: 9-cis-10′-apo-β-carotenal:oxygen oxidoreductase (14,15-cleaving, carlactone-forming)
Comments: Requires Fe2+. The enzyme participates in a pathway leading to biosynthesis of strigolactones, plant hormones involved in promotion of symbiotic associations known as arbuscular mycorrhiza. Also catalyses EC, all-trans-10′-apo-β-carotenal 13,14-cleaving dioxygenase, but 10-fold slower.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc
1.  Sorefan, K., Booker, J., Haurogne, K., Goussot, M., Bainbridge, K., Foo, E., Chatfield, S., Ward, S., Beveridge, C., Rameau, C. and Leyser, O. MAX4 and RMS1 are orthologous dioxygenase-like genes that regulate shoot branching in Arabidopsis and pea. Genes Dev. 17 (2003) 1469–1474. [DOI] [PMID: 12815068]
2.  Schwartz, S.H., Qin, X. and Loewen, M.C. The biochemical characterization of two carotenoid cleavage enzymes from Arabidopsis indicates that a carotenoid-derived compound inhibits lateral branching. J. Biol. Chem. 279 (2004) 46940–46945. [DOI] [PMID: 15342640]
3.  Alder, A., Jamil, M., Marzorati, M., Bruno, M., Vermathen, M., Bigler, P., Ghisla, S., Bouwmeester, H., Beyer, P. and Al-Babili, S. The path from β-carotene to carlactone, a strigolactone-like plant hormone. Science 335 (2012) 1348–1351. [DOI] [PMID: 22422982]
[EC created 2012]

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