Abstract
The expression, regulation and cellular localization of ZmHyPRP, a gene marker of embryo differentiation whose expression declines after ABA induction, was studied. ZmHyPRP is a proline-rich protein with a C-terminal domain having eight cysteines in a CM8 pattern. Transient expression in onion epidermal cells, transformed with a 2x35S::ZmHyPRP-GFP construction, indicated the protein is present in vesicles lining the membrane of the cell. The ZmHyPRP gene expression is under the control of classic promoter seed-specific regulatory elements such as Sph/RY and G-boxes, suggesting regulation by B3 and b-ZIP transcription factors. Promoter deletion analysis, by particle-bombardment transient transformation of maize immature embryos with serial deletions of the promoter fused to GUS, showed the presence of two negative regulatory elements, NE1 (−2070 to −1280) and NE2 (−232 to −178), in the ZmHyPRP promoter. By selective deletion or mutation of ZmHyPRP regulatory promoter elements we conclude that the promoter expression is attenuated by the NE2 element as well as by the G-box2 and the Sph1-2 box together with the G-box2.
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Acknowledgments
We are indebted to D. Ludevid (CRAG) for critical interpretation of the protein expression results, and to M. Amoros for assistance in confocal microscopy and P. Fontanet for help in the greenhouse. This work was supported by grants BI02004-01577, BI02007-64791. Consolider CSD2007-00036 Centro de Agrigenómica y Orientación Alimentaria (MICINN). SGR2009 703 Grup de Recerca Consolidat “Genetica Molecular Vegetal” (AGAUR). Xarxa de referencia en Biotecnologia (DIUE).
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11103_2012_9951_MOESM1_ESM.docx
Supplementary material 1 (DOCX 16 kb): Description of primers used to obtain the constructions used in the ZmHyPRP promoter study by transient expression
11103_2012_9951_MOESM2_ESM.ppt
Supplementary material 2 (PPT 481 kb): Comparative gel blot analysis of the mRNA expression pattern of various genes during maize W64A embryogenesis. a Each of the indicated cDNA probes was hybridized to total RNA isolated from W64A wild-type embryos harvested at different days after anthesis (10 μg RNA/slot). b Control of grain and embryo fresh weights at different days after anthesis. (Ι) Standard deviation
11103_2012_9951_MOESM3_ESM.pptx
Supplementary material 3 (PPTX 718 kb): Bombardment control studies. Comparative mRNA gel blot analysis from maize excised embryos (16–18 dap), incubated for different times in MSO: 1- zero; 2- 24 h; 3- 48 h. (10 μg RNA/slot). The same blot was hybridized successively with all the probes. Equal loading was verified by EtBr staining
11103_2012_9951_MOESM4_ESM.pptx
Supplementary material 4 (PPTX 4180 kb): Comparative gel blot analysis of the mRNA expression pattern of genes during maize vp1 embryogenesis from semi-dormant embryos. Each of the indicated cDNA probes was hybridized to total RNA isolated from vp1 semi-dormant embryos harvested at different days after anthesis. Equal input was verified by EtBr staining. The same blot was successively hybridized with all the probes. 10 μg RNA/slot
11103_2012_9951_MOESM5_ESM.pptx
Supplementary material 5 (PPTX 70 kb): Distribution of Sph/RY, G-boxes and TATAAA box elements in plant gene promoters. Nucleotide distances from the ATG are indicated.▲ b-Zip G-boxes; △ b-Zip opaque- boxes; ◆ Sph/RY elements; ▮ TATAAA box. Gene references: At2S3 Z24744; BnnapA FN807060; PvPHSβ J01263; PvDLEC2 K03289; VfLeB4 X03677; Hvβ-Hor2 X87232; ZmRAB17 X15994; TaEm X52103; OsRAB16a Y00842 and ZmC1 X06333
11103_2012_9951_MOESM6_ESM.xlsx
Supplementary material 6 (XLSX 20 kb): Presence of Sph/RY elements in different plant gene promoters. Consensus sequences for the Sph1 restriction site, Sph and RY elements are in bold. Sequences around the central double repeat consensus sequence are shown. Nucleotides divergent from consensus sequences are in lower case. Described genes are as follows: ZmHyPRP (X60432); ZmC1 X06333; ZmRAB17 X15994; TaEm X52103; Osem U22102; OsRAB16a Y00842; Hvβ-Hor2 X87232; PvDLEC2 K03289; VfLeB4 X03677; GmG1 X15121; BnnapA FN807060; At2S3 Z24744; AtSDH2-3 At5g65165; AtGA3ox2 At1g80340, PvPHSβ J01263 and PspSI X66368. Sequence position from the ATG is indicated on the left and by a vertical arrow
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Jose-Estanyol, M., Puigdomènech, P. Cellular localization of the embryo-specific Hybrid PRP from Zea mays, and characterization of promoter regulatory elements of its gene. Plant Mol Biol 80, 325–335 (2012). https://doi.org/10.1007/s11103-012-9951-9
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DOI: https://doi.org/10.1007/s11103-012-9951-9