The structure of chloroplast ferredoxin in water is unstructured however in a 30:70 molar-ratio mixture of 2,2,2-trifluoroethanol, residues 3 to 13 form an alpha-helix. The rest of the peptide remains unstructured [1]. This family is the N-terminal of the [2Fe-2S) ferredoxin from C.reinhardtii. This protein catalyses the final reaction in a pathway which allows the production of H(2) from water in the chloroplast [2].

1: NMR structures of ferredoxin chloroplastic transit peptide from Chlamydomonas reinhardtii promoted by trifluoroethanol in aqueous solution. Lancelin JM, Bally I, Arlaud GJ, Blackledge M, Gans P, Stein M, Jacquot JP; FEBS Lett. 1994;343:261-266. PMID:8174712

2: Atomic resolution modeling of the ferredoxin:[FeFe] hydrogenase complex from Chlamydomonas reinhardtii. Chang CH, King PW, Ghirardi ML, Kim K; Biophys J. 2007;93:3034-3045. PMID:17660315