P-cluster from Mo-independent nitrogenases, deprotonated to pH 7.3. Unfortunately, there are no structures available, and one of the O ligands of Fe has actually not been confirmed (hence the X in the name)
Stars
This entity has been manually annotated by the ChEBI Team.
An organic molecule or ion (usually a metal ion) that is required by an enzyme for its activity. It may be attached either loosely (coenzyme) or tightly (prosthetic group).