7-Hydroxymethyl chlorophyll a reductase

7-Hydroxymethyl chlorophyll a reductase (EC 1.17.7.2, HCAR) is an enzyme with systematic name 71-hydroxychlorophyll a:ferredoxin oxidoreductase.^[1] This enzyme catalyses the following chemical reaction

71-hydroxychlorophyll a + 2 reduced ferredoxin + 2 H⁺

\rightleftharpoons

chlorophyll a + 2 oxidized ferredoxin + H₂O

7-Hydroxymethyl chlorophyll is a reductase that contains FAD and an iron-sulfur center.

References

↑ Meguro, M.; Ito, H.; Takabayashi, A.; Tanaka, R.; Tanaka, A. (2011). "Identification of the 7-hydroxymethyl chlorophyll a reductase of the chlorophyll cycle in Arabidopsis". Plant Cell. 23: 3442–3453. doi:10.1105/tpc.111.089714. PMID 21934147.

Other oxidoreductases (EC 1.15-1.21)

1.15: Acting on superoxide as acceptor	Superoxide dismutase SOD1 SOD2 SOD3

1.16: Oxidizing metal ions	Ceruloplasmin

1.17: Acting on CH or CH2 groups	Xanthine oxidase Ribonucleotide reductase 4-Hydroxy-3-methylbut-2-enyl diphosphate reductase

1.18: Acting on iron-sulfur proteins as donors	Nitrogenase

1.19: Acting on reduced flavodoxin as donor	Nitrogenase (flavodoxin)

1.20: Acting on phosphorus or arsenic in donors	Glutaredoxin GLRX GLRX2 GLRX3 GLRX5

1.21: Acting on X-H and Y-H to form an X-Y bond	Isopenicillin N synthase Columbamine oxidase Reticuline oxidase Sulochrin oxidase (+)-bisdechlorogeodin-forming (-)-bisdechlorogeodin-forming Aureusidin synthase Tetrahydrocannabinolic acid synthase Cannabidiolic acid synthase Dichlorochromopyrrolate 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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