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Lyases;
Other lyases;
Sole sub-subclass for lyases that do not belong in the other subclasses
chlorophyll a magnesium lyase
Inhibited by Ca2+, Mg2+ and especially Hg2+. SGR has very low activity with chlorophyllide a and none with chlorophyll b. It acts on chlorophyll a both in its free form and in protein complex. SGRL, on the other hand, is more active with chlorophyllide a than with chlorophyll a. The magnesium formed is scavenged by MCS (metal-chelating substance).
EC 4.99.1.10 created 2017
Porphyrin and chlorophyll metabolism |
Biosynthesis of secondary metabolites |
magnesium dechelatase |
Tang L, Okazawa A, Fukusaki E, Kobayashi A
Removal of magnesium by Mg-dechelatase is a major step in the chlorophyll-degrading pathway in Ginkgo biloba in the process of autumnal tints.
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Costa, M.A., Civello, P.M., Chaves, A.R. and Martinez, G.A.
Characterization of Mg-dechelatase activity obtained from Fragaria x ananassa fruit.
Plant Physiol Biochem 40:111-118 (2002)
Wang T, Quisenberry SS, Ni X, Tolmay V
Enzymatic chlorophyll degradation in wheat near-isogenic lines elicited by cereal aphid (Homoptera: Aphididae) feeding.
Suzuki T, Kunieda T, Murai F, Morioka S, Shioi Y
Mg-dechelation activity in radish cotyledons with artificial and native substrates, Mg-chlorophyllin a and chlorophyllide a.
5
Kunieda, T., Amano, T. and Shioi, Y.
Search for chlorophyll degradation enzyme, Mg-dechelatase, from extracts of Chenopodium album with native and artificial substrates.
Plant Sci 169:177-183 (2005)
Shimoda Y, Ito H, Tanaka A
Arabidopsis STAY-GREEN, Mendel’s Green Cotyledon Gene, Encodes Magnesium-Dechelatase.
4.99.1.10 |
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