SecA homolog in protein transport within chloroplasts: evidence for endosymbiont-derived sorting.
basic_science · Level V
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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.
Medical subject headings
- Carrier Proteins
- Chloroplasts
- Escherichia coli Proteins
- Membrane Proteins
- Membrane Transport Proteins
- Photosynthetic Reaction Center Complex Proteins
- Photosystem II Protein Complex
- Plant Proteins
- Plastocyanin