Participates in various redox reactions through the reversible oxidation of the active center dithiol to a disulfide. The F form is known to activate a number of enzymes of the photosynthetic carbon cycle (By similarity). TRXF_MESCR MAMQLSLSHQSWAKSLASPITSFDPARSPPKRVELGPNCLNGGATAGKLMREKVGERMRMSGRSCCVKASLETAVGAESETLVGKVTEVDKDTFWPIANGAGDKPVVLDMYTQWCGPCKVMAPKYQELAEKLLDVVFLKLDCNQENKPLAKELGIRVVPTFKILKGGKIVDEVTGAKFDKLVAAIEAARSS 191 Thioredoxin F-type, chloroplastic