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The N‐terminal sequences of the 16 and 23 kDa extrinsic membrane proteins in photosystem II of spinach have been determined by solid‐phase sequencing. The sequence of the 23 kDa protein has been corroborated by a small 3 kDa CNBr fragment confirming partial N‐terminal processing by a protease of unknown nature. A secondary structure analysis of the 23 kDa protein by circular dichroism has been performed indicating a β‐structure content of 61 % with only 14% α‐helix conformation.
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Vater et al. (1986) studied this question.
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