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SecA homolog in protein transport within chloroplasts: evidence for endosymbiont-derived sorting
1Plant Molecular and Cellular Biology Program, University of Florida, Gainesville 32611.
Science (New York, N.Y.)
|November 4, 1994
Abstract:
The SecA protein is an essential, azide-sensitive component of the bacterial protein translocation machinery. A SecA protein homolog (CPSecA) now identified in pea chloroplasts was purified to homogeneity. CPSecA supported protein transport into thylakoids, the chloroplast internal membrane network, in an azide-sensitive fashion. Only one of three pathways for protein transport into thylakoids uses the CPSecA mechanism. The use of a bacteria-homologous mechanism in intrachloroplast protein transport provides evidence for conservative sorting of proteins within chloroplasts.