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EC 4.99.1.10 Details
EC number
4.99.1.10
Accepted name
magnesium dechelatase
Reaction
(1) chlorophyll a + 2 H+ = pheophytin a + Mg2+;;(2) chlorophyllide a + 2 H+ = pheophorbide a + Mg2+
Other name(s)
SGR (gene name), SGRL (gene name), Mg-dechelatase
Systematic name
chlorophyll a magnesium lyase
Comment
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).
History
created 2017
EC Tree
1.14.14.2 created 1972, deleted 1976
1.14.14.4 created 2000, deleted 2002