Ferredoxin-1 Ferredoxin I 65 MAMKIDPELCTSCGDCEPVCPTNAIAPKKGVYVINADTCTECEGEHDLPQCVNACMTDNCINPAA FDXN_RHOCA fdxN Ferredoxins are iron-sulfur proteins that transfer electrons in a wide variety of metabolic reactions. This ferredoxin probably participates in nitrogen fixation.