SecA Homolog in Protein Transport Within Chloroplasts: Evidence for Endosymbiont-Derived Sorting
- 4 November 1994
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 266 (5186) , 796-798
- https://doi.org/10.1126/science.7973633
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.Keywords
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