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Science 28 June 1996:
Vol. 272. no. 5270, pp. 1849 - 0
DOI:

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This Week in Science

Chloroplast genomes encode all of the various proteins that make up the RNA transcription machinery except for the sigma factor, which affects promoter selectivity. Tanaka et al. (p. 1932) found that the missing gene is not in the chloroplast but is found in the nuclear genome. The nuclear gene product shows sequence similarity to cyanobacterial sigma factors and is imported into the chloroplast. This unusual distribution of genes may represent transfer of a gene from the primitive endosymbiont to the host nuclear genome during the evolution of eukaryotic cells.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)