Hlorofilid-a oksigenaza
(Preusmjereno sa stranice Chlorophyllide-a:oxygen 71-oxidoreductase)
Hlorofilid-a oksigenaza | |||||||||
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Identifikatori | |||||||||
EC broj | 1.14.13.122 | ||||||||
CAS broj | 216503-73-0 | ||||||||
IntEnz | IntEnz view | ||||||||
BRENDA | BRENDA entry | ||||||||
ExPASy | NiceZyme view | ||||||||
KEGG | KEGG entry | ||||||||
MetaCyc | metabolic pathway | ||||||||
PRIAM | profile | ||||||||
PDB | RCSB PDB PDBe PDBj PDBsum | ||||||||
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Hlorofilid-a oksigenaza (EC 1.14.13.122, hlorofilid a oksigenaza, hlorofil-b sintaza, CAO) je enzim sa sistematskim imenom hlorofilid-a:kiseonik 7-oksidoreduktaza.[1][2][3][4] Ovaj enzim katalizuje sledeću hemijsku reakciju
- (1) hlorofilid a + O2 + NADPH + H+ 7-hidroksihlorofilid a +H2O + NADP+
- (2) 7-hidroksihlorofilid a + O2 + NADPH + H+ hlorofilid b + 2H2O + NADP+
Hlorofil b je neophodan za formiranje stabilnog kompleksa ubiranja svetlosti kod hloroplastnih zelenih algi, cijanobakterija i biljki.
- ↑ Espineda, C.E., Linford, A.S., Devine, D. and Brusslan, J.A. (1999). „The AtCAO gene, encoding chlorophyll a oxygenase, is required for chlorophyll b synthesis in Arabidopsis thaliana”. Proc. Natl. Acad. Sci. USA 96: 10507-10511. PMID 10468639.
- ↑ Oster, U., Tanaka, R., Tanaka, A. and Rüdiger, W. (2000). „Cloning and functional expression of the gene encoding the key enzyme for chlorophyll b biosynthesis (CAO) from Arabidopsis thaliana”. Plant J. 21: 305-310. PMID 10758481.
- ↑ Eggink, L.L., LoBrutto, R., Brune, D.C., Brusslan, J., Yamasato, A., Tanaka, A. and Hoober, J.K. (2004). „Synthesis of chlorophyll b: localization of chlorophyllide a oxygenase and discovery of a stable radical in the catalytic subunit”. BMC Plant Biol. 4: 5-5. PMID 15086960.
- ↑ Porra, R.J., Schafer, W., Cmiel, E., Katheder, I. and Scheer, H. (1994). „The derivation of the formyl-group oxygen of chlorophyll b in higher plants from molecular oxygen. Achievement of high enrichment of the 7-formyl-group oxygen from 18O2 in greening maize leaves”. Eur. J. Biochem. 219: 671-679. PMID 8307032.
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