Background: In chloroplasts of higher plants, a heterodimeric cpSRP43⅐cpSRP54 complex targets LHC proteins to the thylakoid membrane. Results: In green algae, cpSRP43 alone forms a targeting complex with LHC proteins. Conclusion: The coevolution of LHC proteins and cpSRP43 occurred independently of complex formation with cpSRP54. Significance: The results provide new insights into the evolution of cpSRP-dependent protein transport.
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