EC Number   |
Natural Substrates |
|---|
    6.6.1.1 | ATP + deuteroporphyrin IX + Mg2+ + H2O |
magnesium chelatase catalyzes the first committed step in chlorophyll biosynthesis |
| 6.6.1.1 | ATP + protoporphyrin IX + Mg2+ + H2O |
- |
| 6.6.1.1 | ATP + protoporphyrin IX + Mg2+ + H2O |
magnesium chelatase H subunit markedly enhances magnesium protoporphyrin methyltransferase catalysis by accelerating the formation and breakdown of the catalytic intermediate, providing a kinetic link between the first two reactions of chlorophyll biosynthesis with the signalling molecule magnesium protoporphyrin as the common factor |
| 6.6.1.1 | ATP + protoporphyrin IX + Mg2+ + H2O |
the enzyme catalyzes the insertion of magnesium into protoporphyrin IX, the first unique step of the chlorophyll biosynthetic pathway |
| 6.6.1.1 | ATP + protoporphyrin IX + Mg2+ + H2O |
insertion of magnesium into protoporphyrin IX by magnesium chelatase is a key step in the chlorophyll biosynthetic pathway |
| 6.6.1.1 | more |
BchH is the rate-limiting component of Mg chelatase in cell extracts, and its slective inactivation during adaption to aerobic growth may account for the rapid inactivation of Mg chelatase in vivo when anaerobically growing cells are exposed to O2 in the light |
| 6.6.1.1 | more |
the pattern of changes in RNA transcript levels of the magnesium chelatase genes, chlH, chlD and chlI of Chlamydomonas reinhardtii grown under synchronous culture conditions in light/dark cycles are similar. Light is involved in regulation |
| 6.6.1.1 | more |
mutant with a non-functional magnesium chelatase subunit D assembles a Zn-BChl photosystem |
| 6.6.1.1 | more |
subunit isoform ChlI2 shows ATPase activity, but with lower Vmax and higher Km value than isoform ChlI1. Although it plays a limited role in chlorophyll biosynthesis, it certainly contributes to the assembly of the Mg-chelatase complex |
| 6.6.1.1 | more |
using a surface plasmon resonance system, it is shown that abscisic acid binds to CHLH, but not to the other Mg-chelatase components/subunits CHLI, CHLD (D subunit) and GUN4 |
