magnesium ion binding

Binding to a magnesium (Mg) ion.

magnesium protoporphyrin IX methyltransferase activity

Catalysis of the reaction: Mg-protoporphyrin IX + S-adenosyl-L-methionine = Mg-protoporphyrin IX 13-monomethyl ester + S-adenosyl-L-homocysteine.

magnesium chelatase activity

Catalysis of the reaction: ATP + H2O + Mg2+ + protoporphyrin IX = ADP + 3 H+ + Mg-protoporphyrin IX + phosphate.

magnesium ion transmembrane transporter activity

Enables the transfer of magnesium (Mg) ions from one side of a membrane to the other.

magnesium ion transport

The directed movement of magnesium (Mg) ions into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore.

magnesium chelatase complex

A heterotrimeric enzyme complex composed of three subunits, all of which are required for enzyme activity, which catalyzes the chelation of Mg by proto IX in an ATP-dependent manner.