Transport of Proteins into Cryptomonads Complex Plastids

Complex plastids, found in many alga groups, are surrounded by three or four membranes. Therefore, proteins of the complex plastids, which are encoded in the cell nucleus, must cross three or four membranes during transport to the plastid. To study this process we have developed a method for isolati...

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Veröffentlicht in:The Journal of biological chemistry 2000-07, Vol.275 (30), p.23194-23198
Hauptverfasser: Wastl, Jürgen, Maier, Uwe-G.
Format: Artikel
Sprache:eng
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Zusammenfassung:Complex plastids, found in many alga groups, are surrounded by three or four membranes. Therefore, proteins of the complex plastids, which are encoded in the cell nucleus, must cross three or four membranes during transport to the plastid. To study this process we have developed a method for isolating transport-competent two membrane-bound plastids derived from the complex plastids of the cryptophyte Guillardia theta. This in vitroprotein import system provides the first non-heterologous system for studying the import of proteins into four-membrane complex plastids. We use our import system as well as canine microsomes to demonstrate in the case of cryptomonads how nuclear proteins pass the first nucleomorph-encoded proteins the third and fourth membrane and discuss the potential mechanisms for protein transport across the second membrane.
ISSN:0021-9258
1083-351X
DOI:10.1074/jbc.M003125200