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Chlorophyllide-a oxygenase

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Chlorophyllide-a oxygenase
Identifiers
EC no.1.13.12.14
CAS no.216503-73-0
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Chlorophyllide-a oxygenase (EC 1.13.12.14, chlorophyllide a oxygenase, cholorophyll-b synthase, CAO) is an enzyme with system name chlorophyllide-a:oxygen 7-oxidoreductase.[1][2][3][4] This enzyme catalyses the following chemical reaction

(1) chlorophyllide a + O2 + NADPH + H+ 7-hydroxychlorophyllide a + H2O + NADP+
(2) 7-hydroxychlorophyllide a + O2 + NADPH + H+ chlorophyllide b + 2 H2O + NADP+

This enzyme contains a mononuclear iron centre.

References

  1. ^ 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.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  2. ^ 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.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  3. ^ 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.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  4. ^ 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.{{cite journal}}: CS1 maint: multiple names: authors list (link)