The newly reported 9-kDa polypeptide in photosystem I [(1991) FEBS Lett. 280, 332-334] is an extrinsic component located on the lumenal side of the thylakoid membrane. This subunit can be solubilized with high salt buffer and does not bind any cofactors. The photosystem I electron transfer chain remains intact and functional in the absence of this component as characterized by the photoreduction of NADP+.
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He et al. (1992) studied this question.
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