Abstract
The expression of parA, an auxin-regulated gene expressed during the culture of tobacco (Nicotiana tabacum L.) mesophyll protoplasts, is induced by cadmium. To identify the cadmium-responsive element, we examined the parA promoter using the GUS reporter gene. Cadmium responsiveness was retained in a 5' deletion of the parA promoter to -78 bp, but it was nullified by further deletion to -49bp, which implies that the region -49 to -78 bp contained a cadmium-responsive element. This region contains a sequence similar to as-1, an enhancer sequence from the cauliflower mosaic virus 35S RNA promoter that binds the nuclear factor ASF-1. We named the sequence in the parA promoter pas. Gel-shift assays revealed that pas and as-1 compete for the same DNA-binding nuclear protein(s). Since pentamers of either pas and as-1 were able to confer cadmium responsiveness on a minimal promoter but mutant as-1 was not, we propose that pas and as-1 are involved in cadmium-responsive gene expression. Neither pas nor as-1 conferred responsiveness to copper. The specificity of this response, involving the function of as-1-related elements including pas, is discussed.
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- Czarnecka E., Nagao R. T., Key J. L., Gurley W. B. Characterization of Gmhsp26-A, a stress gene encoding a divergent heat shock protein of soybean: heavy-metal-induced inhibition of intron processing. Mol Cell Biol. 1988 Mar;8(3):1113–1122. doi: 10.1128/mcb.8.3.1113. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Ellis J. G., Tokuhisa J. G., Llewellyn D. J., Bouchez D., Singh K., Dennis E. S., Peacock W. J. Does the ocs-element occur as a functional component of the promoters of plant genes? Plant J. 1993 Sep;4(3):433–443. doi: 10.1046/j.1365-313x.1993.04030433.x. [DOI] [PubMed] [Google Scholar]
- Evans I. M., Gatehouse L. N., Gatehouse J. A., Robinson N. J., Croy R. R. A gene from pea (Pisum sativum L.) with homology to metallothionein genes. FEBS Lett. 1990 Mar 12;262(1):29–32. doi: 10.1016/0014-5793(90)80145-9. [DOI] [PubMed] [Google Scholar]
- Fürst P., Hu S., Hackett R., Hamer D. Copper activates metallothionein gene transcription by altering the conformation of a specific DNA binding protein. Cell. 1988 Nov 18;55(4):705–717. doi: 10.1016/0092-8674(88)90229-2. [DOI] [PubMed] [Google Scholar]
- Hagen G., Uhrhammer N., Guilfoyle T. J. Regulation of expression of an auxin-induced soybean sequence by cadmium. J Biol Chem. 1988 May 5;263(13):6442–6446. [PubMed] [Google Scholar]
- Hamer D. H. Metallothionein. Annu Rev Biochem. 1986;55:913–951. doi: 10.1146/annurev.bi.55.070186.004405. [DOI] [PubMed] [Google Scholar]
- Kawata T., Imada T., Shiraishi H., Okada K., Shimura Y., Iwabuchi M. A cDNA clone encoding HBP-1b homologue in Arabidopsis thaliana. Nucleic Acids Res. 1992 Mar 11;20(5):1141–1141. doi: 10.1093/nar/20.5.1141. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Kim Y., Buckley K., Costa M. A., An G. A 20 nucleotide upstream element is essential for the nopaline synthase (nos) promoter activity. Plant Mol Biol. 1994 Jan;24(1):105–117. doi: 10.1007/BF00040578. [DOI] [PubMed] [Google Scholar]
- Lam E., Benfey P. N., Gilmartin P. M., Fang R. X., Chua N. H. Site-specific mutations alter in vitro factor binding and change promoter expression pattern in transgenic plants. Proc Natl Acad Sci U S A. 1989 Oct;86(20):7890–7894. doi: 10.1073/pnas.86.20.7890. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Lam E., Chua N. H. Tetramer of a 21-base pair synthetic element confers seed expression and transcriptional enhancement in response to water stress and abscisic acid. J Biol Chem. 1991 Sep 15;266(26):17131–17135. [PubMed] [Google Scholar]
- Lam E., Katagiri F., Chua N. H. Plant nuclear factor ASF-1 binds to an essential region of the nopaline synthase promoter. J Biol Chem. 1990 Jun 15;265(17):9909–9913. [PubMed] [Google Scholar]
- Lescure A. M., Proudhon D., Pesey H., Ragland M., Theil E. C., Briat J. F. Ferritin gene transcription is regulated by iron in soybean cell cultures. Proc Natl Acad Sci U S A. 1991 Sep 15;88(18):8222–8226. doi: 10.1073/pnas.88.18.8222. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Liu X., Lam E. Two binding sites for the plant transcription factor ASF-1 can respond to auxin treatments in transgenic tobacco. J Biol Chem. 1994 Jan 7;269(1):668–675. [PubMed] [Google Scholar]
- Mett V. L., Lochhead L. P., Reynolds P. H. Copper-controllable gene expression system for whole plants. Proc Natl Acad Sci U S A. 1993 May 15;90(10):4567–4571. doi: 10.1073/pnas.90.10.4567. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Miao Z. H., Liu X., Lam E. TGA3 is a distinct member of the TGA family of bZIP transcription factors in Arabidopsis thaliana. Plant Mol Biol. 1994 Apr;25(1):1–11. doi: 10.1007/BF00024193. [DOI] [PubMed] [Google Scholar]
- Qin X. F., Holuigue L., Horvath D. M., Chua N. H. Immediate early transcription activation by salicylic acid via the cauliflower mosaic virus as-1 element. Plant Cell. 1994 Jun;6(6):863–874. doi: 10.1105/tpc.6.6.863. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Rauser W. E. Phytochelatins and related peptides. Structure, biosynthesis, and function. Plant Physiol. 1995 Dec;109(4):1141–1149. doi: 10.1104/pp.109.4.1141. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Schindler U., Beckmann H., Cashmore A. R. TGA1 and G-box binding factors: two distinct classes of Arabidopsis leucine zipper proteins compete for the G-box-like element TGACGTGG. Plant Cell. 1992 Oct;4(10):1309–1319. doi: 10.1105/tpc.4.10.1309. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Takahashi Y., Kuroda H., Tanaka T., Machida Y., Takebe I., Nagata T. Isolation of an auxin-regulated gene cDNA expressed during the transition from G0 to S phase in tobacco mesophyll protoplasts. Proc Natl Acad Sci U S A. 1989 Dec;86(23):9279–9283. doi: 10.1073/pnas.86.23.9279. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Takahashi Y., Kusaba M., Hiraoka Y., Nagata T. Characterization of the auxin-regulated par gene from tobacco mesophyll protoplasts. Plant J. 1991 Nov;1(3):327–332. doi: 10.1046/j.1365-313x.1991.t01-2-00999.x. [DOI] [PubMed] [Google Scholar]
- Takahashi Y., Sakai T., Ishida S., Nagata T. Identification of auxin-responsive elements of parB and their expression in apices of shoot and root. Proc Natl Acad Sci U S A. 1995 Jul 3;92(14):6359–6363. doi: 10.1073/pnas.92.14.6359. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Tommey A. M., Shi J., Lindsay W. P., Urwin P. E., Robinson N. J. Expression of the pea gene PSMTA in E. coli. Metal-binding properties of the expressed protein. FEBS Lett. 1991 Nov 4;292(1-2):48–52. doi: 10.1016/0014-5793(91)80831-m. [DOI] [PubMed] [Google Scholar]
- Zhang B., Singh K. B. ocs element promoter sequences are activated by auxin and salicylic acid in Arabidopsis. Proc Natl Acad Sci U S A. 1994 Mar 29;91(7):2507–2511. doi: 10.1073/pnas.91.7.2507. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Zhou J., Goldsbrough P. B. Functional homologs of fungal metallothionein genes from Arabidopsis. Plant Cell. 1994 Jun;6(6):875–884. doi: 10.1105/tpc.6.6.875. [DOI] [PMC free article] [PubMed] [Google Scholar]
- de Miranda J. R., Thomas M. A., Thurman D. A., Tomsett A. B. Metallothionein genes from the flowering plant Mimulus guttatus. FEBS Lett. 1990 Jan 29;260(2):277–280. doi: 10.1016/0014-5793(90)80122-y. [DOI] [PubMed] [Google Scholar]