Pyruvate-flavodoxin oxidoreductase, EKR domain <p> EKR is a short, 33 residue, domain found in bacterial and some lower eukaryotic species which lies between a POR (pyruvate ferredoxin/flavodoxin oxidoreductase) domain (<db_xref db="INTERPRO" dbkey="IPR019752"/>) and the 4Fe-4S binding domain (<db_xref db="INTERPRO" dbkey="IPR017896"/>). It contains a characteristic EKR sequence motif. The exact function of this domain is not known. </p>