The small polypeptides present in the pea photosystem II reaction centre complex have been separated by high‐resolution SDS‐polyacrylamide gel electrophoresis and characterised by N‐terminal amino acid sequencing. Two polypeptides are identified as the α‐ and β‐subunits of cytochrome b559 which are the products of the pdbE and psbF genes. A third polypeptide, of 4.5 kDA, is identified as the product of a small open reading frame in chloroplast DNA. The gene for this polypeptide , psbI, is located just downstream of the psbK gene chloroplast DNA.
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Webber et al. (1989) studied this question.
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