Soybean EF1A2 promoter and its use in constitutive expression of transgenic genes in plants
The promoter of a soybean translation elongation factor EF1 alpha, a polypeptide that promotes the GTP-dependent binding of aminoacyl-tRNA to the A-site of ribosomes during protein biosynthesis, and fragments thereof and their use in promoting the expression of one or more heterologous nucleic acid fragments in a tissue-independent or constitutive manner in plants are described.
1. A recombinant DNA comprising a nucleotide sequence comprising the sequence set forth in SEQ ID NO:1, SEQ ID NO:2, SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:5, or SEQ ID NO:6, operably linked to at least one heterologous sequence, wherein said nucleotide sequence has constitutive promoter activity.
2. A recombinant DNA construct comprising a nucleotide sequence comprising bases 800-1502 of SEQ ID NO:1, bases 482-1184 of SEQ ID NO:2, or 212-924 SEQ ID NO:3 and at least 211 contiguous nucleotides upstream of SEQ ID NO:1, SEQ ID NO:2, or SEQ ID NO:3, operably linked to at least one heterologous sequence, wherein said nucleotide sequence has constitutive promoter activity.
3. A vector comprising the recombinant DNA construct of any one of claim 1 or 2 .
4. A cell comprising the recombinant DNA construct of any one of claim 1 or 2 .
5. The cell of claim 4 , wherein the cell is a plant cell.
6. A transgenic plant having stably incorporated into its genome the recombinant DNA construct of any one of claim 1 or 2 .
7. The transgenic plant of claim 6 wherein said plant is selected from the group consisting of dicotyledonous plants.
8. The plant of claim 7 wherein the plant is soybean.
9. A transgenic seed produced by the transgenic plant of claim 7 , wherein the transgenic seed comprises the recombinant DNA construct.
10. A method of expressing a coding sequence or a functional RNA in a plant comprising:
a) introducing the recombinant DNA construct of any one of claim 1 or 3 into the plant, wherein the at least one heterologous sequence comprises a coding sequence or encodes a functional RNA;
b) growing the plant of step a); and
c) selecting a plant displaying expression of the coding sequence or the functional RNA of the recombinant DNA construct.
11. A method of transgenically altering a marketable plant trait, comprising:
a) introducing a recombinant DNA construct of any one of claim 1 or 3 into the plant;
b) growing a fertile, mature plant resulting from step a); and
c) selecting a plant expressing the at least one heterologous nucleotide sequence in at least one plant tissue based on the altered marketable trait.
12. The method of claim 11 wherein the marketable trait is selected from the group consisting of: disease resistance, herbicide resistance, insect resistance carbohydrate metabolism, fatty acid metabolism, amino acid metabolism, plant development, plant growth regulation, yield improvement, drought resistance, cold resistance, heat resistance, and salt resistance.
13. A method for altering expression of at least one heterologous nucleic acid fragment in plant comprising:
(a) transforming a plant cell with the recombinant expression construct of any one of claim 1 or 2 ;
(b) growing fertile mature plants from transformed plant cell of step (a); and
(c) selecting plants containing the transformed plant cell wherein the expression of the heterologous nucleic acid fragment is increased or decreased.
14. The method of claim 13 wherein the plant is a soybean plant.
15. A method for expressing a yellow fluorescent protein ZS-YELLOW1 N1 in a plant cell comprising:
(a) transforming a plant cell with a recombinant expression construct comprising at least one ZS-YELLOW1 N1 (YFP) nucleic acid fragment operably linked to a promoter wherein said promoter consists essentially of the nucleotide sequence set forth in SEQ ID NOs:1, 3, or 4; and,
(b) growing the transformed plant cell under conditions for expression of the recombinant DNA construct, wherein expression of the recombinant DNA construct results in production of increased levels of ZS-YELLOW1 N1 protein in the transformed host cell when compared to a corresponding nontransformed plant cell.
16. A plant stably transformed with a recombinant expression construct comprising a soybean promoter and a heterologous nucleic acid fragment operably linked to said promoter, wherein said promoter is a capable of controlling expression of said heterologous nucleic acid fragment in a plant cell, and further wherein said promoter comprises at least 211 contiguous nucleotides upstream of the 5′ untranslated region of SEQ ID NO:1.
17. The recombinant DNA construct according to claim 1 , wherein the heterologous nucleic acid sequence codes for a gene selected from the group consisting of: a reporter gene, a selection marker, a disease resistance conferring gene, a herbicide resistance conferring gene, an insect resistance conferring gene; a gene involved in carbohydrate metabolism, a gene involved in fatty acid metabolism, a gene involved in amino acid metabolism, a gene involved in plant development, a gene involved in plant growth regulation, a gene involved in yield improvement, a gene involved in drought resistance, a gene involved in cold resistance, a gene involved in heat and salt resistance in plants.
18. The recombinant DNA construct according to claim 1 , wherein the heterologous nucleic acid sequence encodes a protein selected from the group consisting of: a reporter protein, a selection marker, a protein conferring disease resistance, protein conferring herbicide resistance, protein conferring insect resistance; protein involved in carbohydrate metabolism, protein involved in fatty acid metabolism, protein involved in amino acid metabolism, protein involved in plant development, protein involved in plant growth regulation, protein involved in yield improvement, protein involved in drought resistance, protein involved in cold resistance, protein involved in heat resistance and salt resistance in plants.