EKR is a short, 33 residue, domain found in bacterial and some lower eukaryotic species which lies between a POR (pyruvate ferredoxin/flavodoxin oxidoreductase) pfam01558 and the 4Fe-4S binding domain Fer4 pfam00037. It contains a characteriztic EKR sequence motif. The exact function of this domain is not known.
Jiyao W et al.(2023). "The conserved domain database in 2023.",