Structural analysis of chloroplast transit peptides (cTPs), including secondary structure prediction and analysis of 'cTP-like' peptides of known 3D structure, suggests that cTPs are essentially flexible peptides devoid of regular secondary or tertiary structure. It is proposed that cTPs may be designed to interact with a succession of different chaperones on the chloroplast protein-import pathway.
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Heijne et al. (1991) studied this question.
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