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EC Number
Metals/Ions
Commentary
Reference
1.14.19.1
Fe2+
SCD-1 has a di-metal catalytic center consisting of two iron cations (in the crystal structures replaced by zinc cations) that are coordinated by histidine residues and a single water molecule
744416
1.14.19.1
Fe2+
specifically required
437643
1.14.19.1
Mg2+
-
688248
1.14.19.1
more
enzyme contains active sulfhydryl groups
437658
1.14.19.1
more
no special ion requirement
437650
1.14.19.1
superoxid dismutase
8% stimulation
437651
1.14.19.1
Zn2+
-
437646
1.14.19.1
Zn2+
20-25% stimulation
437650
1.14.19.1
Zn2+
incorporation of zinc instead of iron into the protein is likely an artifact of protein overexpression, and zinc remains the predominant metal species even when the growth media and purification solutions are supplemented with iron. Coordination of both zinc ions is consistent with octahedral geometry with one missing ligand. The nine histidines are highly conserved, and eight of them belong to three histidine-containing motifs (two HXXHH motifs and one HX4H motif in SCD1) that are characteristic of integral membrane desaturases
745883
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