Nuclear Encoding of a Chloroplast RNA Polymerase Sigma Subunit in a Red Alga
- 28 June 1996
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 272 (5270) , 1932-1935
- https://doi.org/10.1126/science.272.5270.1932
Abstract
A chloroplast RNA polymerase sigma factor is encoded by a nuclear gene, sigA , in the red alga Cyanidium caldarium RK-1. The encoded protein functions as an RNA polymerase sigma factor in vitro and it is localized to the chloroplast in vivo. SigA shows high sequence similarity to the sigma factors of cyanobacteria, which is indicative of the ancestral endosymbiotic event and subsequent transfer of the sigA gene to the nuclear genome.Keywords
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