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Leaf-specifically expressed genes for polypeptides destined for chloroplasts with domains of σ 70 factors of bacterial RNA polymerases in Arabidopsis thaliana
- Source :
- Proceedings of the National Academy of Sciences. 94:14948-14953
- Publication Year :
- 1997
- Publisher :
- Proceedings of the National Academy of Sciences, 1997.
-
Abstract
- Genes for σ-like factors of bacterial-type RNA polymerase have not been characterized from any multicellular eukaryotes, although they probably play a crucial role in the expression of plastid photosynthesis genes. We have cloned three distinct cDNAs, designated SIG1 , SIG2 , and SIG3 , for polypeptides possessing amino acid sequences for domains conserved in σ 70 factors of bacterial RNA polymerases from the higher plant Arabidopsis thaliana . Each gene is present as one copy per haploid genome without any additional sequences hybridized in the genome. Transient expression assays using green fluorescent protein demonstrated that N-terminal regions of the SIG2 and SIG3 ORFs could function as transit peptides for import into chloroplasts. Transcripts for all three SIG genes were detected in leaves but not in roots, and were induced in leaves of dark-adapted plants in rapid response to light illumination. Together with results of our previous analysis of tissue-specific regulation of transcription of plastid photosynthesis genes, these results indicate that expressed levels of the genes may influence transcription by regulating RNA polymerase activity in a green tissue-specific manner.
- Subjects :
- Chloroplasts
Molecular Sequence Data
Arabidopsis
Sigma Factor
Genes, Plant
Genome
chemistry.chemical_compound
Bacterial Proteins
Transcription (biology)
Sigma factor
RNA polymerase
Amino Acid Sequence
Plastid
Gene
Polymerase
Genetics
Multidisciplinary
biology
Arabidopsis Proteins
DNA-Directed RNA Polymerases
Biological Sciences
biology.organism_classification
chemistry
biology.protein
Peptides
Sequence Alignment
Subjects
Details
- ISSN :
- 10916490 and 00278424
- Volume :
- 94
- Database :
- OpenAIRE
- Journal :
- Proceedings of the National Academy of Sciences
- Accession number :
- edsair.doi.dedup.....bd731832676e90fd7d3174bdcd83d92b