[Akutni]

Why does this page https://iubmb.qmul.ac.uk/enzyme/EC7/ mention:
• Catalysing the translocation of inorganic anions and their chelates
• Catalysing the translocation of inorganic cations

I didn't know anions can form chelates and if so, why wouldn't the group about cations (whose chelates are more common) also be called "... of inorganic cations and their chelates". On top of that, the English Wikipedia has it the other way around https://en.m.wikipedia.org/wiki/Translocase. Can anions really form chelates? I don't know many chelates, but there's usually a positive metal (heme, chlorophyll, B12).

[Borek]

IUPAC definition of chelation (https://goldbook.iupac.org/terms/view/C01012):

The formation or presence of bonds (or other attractive interactions) between two or more separate binding sites within the same ligand and a single central atom.

doesn't limit the idea to metals.