The 20 kDA Apo-Polypeptide of the Chlorophyll a/b Protein Complex CP24 — Characterization and Complete Primary Amino Acid Sequence

The light harvesting apparatus of higher plant photosystem II (PSII) is a highly complex and heterogenous structure consisting of several chlorophyll-binding proteins including the minor chlorophyll a/b complexes, CP29, CP27 and CP24. CP24 was first identified by Dunahay and Staehlin (1) and is estimated to contain only about 5% of the PSII chlorophyll. It is proposed to contain one (2) or several polypeptides in the range of 20–24 kDa (1). CP24 has been suggested to act as a linker protein between the light-harvesting antenna and the core of PSII (1). Others have suggested it to be associated with the light-harvesting apparatus of PSII (3,4).