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Encodes a zinc finger protein that is similar to a subgroup of DnaJ and is involved in cotyledon chloroplast biogenesis. Cyo1 is localized to the thylakoid membrane and has protein disulfide isomerase activity in vivo.Cyo1 is more highly expressed in light grown seedlings. Loss of function mutants have albino cotyledons and abnormal plastids.
Very low expression in etiolated seedlings, but gradual increase upon illumination with a maximum after 6 hours. Expressed mainly in young plants grown under light conditions.
Protein disulfide-isomerase involved in chloroplast development in cotyledons. Involved in the process of vesicle-derived thylakoid formation, probably at the level of the integration and folding of LHCB proteins at the initial location of integration. Acts only in germinating seeds after dormancy, during the transition from heterotrophic to autotrophic growth.
Expressed in roots, rosette and cauline leaves, stems, inflorescences and young siliques of light-grown plants, but not in etiolated seedlings or in senescing tissues.