TAILIEUCHUNG - Báo cáo khoa học: Conservative sorting in a primitive plastid The cyanelle of Cyanophora paradoxa

Higher plant chloroplasts possess at least four different pathways for pro-tein translocation across and protein integration into the thylakoid mem-branes. It is of interest with respect to plastid evolution, which pathways have been retained as a relic from the cyanobacterial ancestor (‘conserva-tive sorting’), which ones have been kept but modified, and which ones were developed at the organelle stage, . are eukaryotic achievements as (largely) the Toc and Tic translocons for envelope import of cytosolic pre-cursor proteins. . | ềFEBS Journal Conservative sorting in a primitive plastid The cyanelle of Cyanophora paradoxa Juergen M. Steiner1 Juergen Berghofer2 Fumie Yusa1 Johannes A. Pompe1 Ralf B. Klosgen2 and Wolfgang Loffelhardt1 1 Max F. Perutz Laboratories University Departments at the Vienna Biocenter Department of Biochemistry and Molecular Cell Biology and Ludwig Boltzmann Research Unit for Biochemistry 2 Martin-Luther-Universitaet Halle-Wittenberg Institute for Plant Physiology Vienna Austria Keywords Cyanophora paradoxa cyanelles conservative sorting Sec translocase Tat translocase Correspondence W. Loffelhardt Max F. Perutz Laboratories University Departments at the Vienna Biocenter Department of Biochemistry and Molecular CellBiology and Ludwig Boltzmann Research Unit for Biochemistry Dr Bohrgasse 9 1030 Vienna Austria Fax 43 14277 9528 Tel 43 14277 52811 E-mail Received 6 September 2004 revised 11 November 2004 accepted 1 7 December 2004 Higher plant chloroplasts possess at least four different pathways for protein translocation across and protein integration into the thylakoid membranes. It is of interest with respect to plastid evolution which pathways have been retained as a relic from the cyanobacterial ancestor conservative sorting which ones have been kept but modified and which ones were developed at the organelle stage . are eukaryotic achievements as largely the Toc and Tic translocons for envelope import of cytosolic precursor proteins. In the absence of data on cyanobacterial protein translocation the cyanelles of the glaucocystophyte alga Cyanophora paradoxa for which in vitro systems for protein import and intraorganellar sorting were elaborated can serve as a model the cyanelles are surrounded by a peptidoglycan wall their thylakoids are covered with phycobilisomes and the composition of their oxygen-evolving complex is another feature shared with cyanobacteria. We demonstrate the operation of the Sec and Tat pathways in .

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