SecA homolog in protein transport within chloroplasts: evidence for endosymbiont-derived sorting - PubMed (original) (raw)

. 1994 Nov 4;266(5186):796-8.

doi: 10.1126/science.7973633.

Affiliations

• PMID: 7973633
• DOI: 10.1126/science.7973633

SecA homolog in protein transport within chloroplasts: evidence for endosymbiont-derived sorting

J Yuan et al. Science. 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.

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