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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Integration of a cyanobacterial protein involved in nitrate reduction (narB) into isolated Synechococcus but not into pea thylakoid membranes.

Chimeric genes comprised of Rubisco small subunit transit peptide fused in frame with full-length and truncated sequences of a nitrate reductase (narB) structural gene of Synechococcus were constructed. Fusion proteins were synthesized in a rabbit reticulocyte system. In thylakoido integration of synthetic proteins resulted in the association of the full-length narB-coded protein to the Synechococcus photosynthetic membranes. The membrane-associated protein was sensitive to trypsin treatment but could not be removed by washing in the presence of NaBr. Trypsin pretreatment of thylakoids abolished the capability for association. The association of the narB-coded protein with thylakoids might require another membrane protein whose identity is not known. It is proposed that the Synechococcus narB polypeptide is a peripheral, membrane bound protein anchored to the thylakoids via a short hydrophobic domain while the major part of the protein resides on the outer side of the thylakoid membranes. The chimeric narB proteins were processed and imported by intact pea chloroplasts in vitro; however, the mature proteins were found localized in the stroma and not in the thylakoid membrane fraction. Similarly, the attempt to integrate the protein in vitro into isolated pea thylakoid membranes failed although these membranes incorporate early light-inducible proteins.[1]

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