Ferredoxin IV Ferredoxin, plant-type 95 ptfA FER4_RHOCA fdxC Ferredoxin-4 Ferredoxins are iron-sulfur proteins that transfer electrons in a wide variety of metabolic reactions. This ferredoxin is required for nitrogen fixation (By similarity). MDKATLTFTDVSITVNVPTGTRIIEMSEKVGSGITYGCREGECGTCMTHILEGSENLSEPTALEMRVLEENLGGKDDRLACQCRVLGGAVKVRPA