A nbumber of Uniprot entries which are heme binding are also mapped to iron ion binding.
In most cases this seems incorrect (becasue heme binding is not a child of iron ion binding)
see
Q10352
O74875
Q9P7X0
for pombe but will apply to lost of other organisms
and
Q9USM6
see comment on SF 2487830
https://sourceforge.net/tracker/index.php?func=detail&aid=2487830&group_id=36855&atid=605890
update: I've talked with John, and added the relationship heme binding is_a iron ion binding (decided that tetrapyrrole binding is a specific enough parent to leave as is).
m
It seems that the is_a relation to iron ion binding was deleted in 2012. However, none of the proteins listed above have both keywords now, they all have "metal ion binding".
Diff:
ok