Abstract
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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