Cloning and characterization of the cDNA for a plastid sigma factor from the moss Physcomitrella patens |
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Authors: | Hara K Sugita M Aoki S |
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Institution: | Division of Biological Informatics, Graduate School of Human Informatics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan. |
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Abstract: | We isolated a cDNA PpSig1 encoding a plastid sigma factor from the moss Physcomitrella patens. The PpSIG1 protein is composed of the conserved subdomains for recognition of -10 and -35 promoter elements, core complex binding and DNA melting. Southern blot analysis showed that the moss sig1 gene is likely a member of a small gene family. Transient expression assay using green fluorescent protein demonstrated that the N-terminal region of PpSIG1 functions as a chloroplast-targeting signal peptide. These observations suggest that multiple nuclear-encoded sigma factors regulate chloroplast gene expression in P. patens. |
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