Claims
- 1. An isolated DNA encoding a protein, said protein having an amino acid sequence of SEQ ID NO:2 termed a pro-Ribosome Inactivating Protein (proRIP), wherein the proRiP has a selectively removable, internal peptlde linker sequence that has from about 9 to 25 amino acids which is at least 70% homologous to residues 162 through 186 of SEQ ID NO;2 and is incapable of substantially inactivating eukaryotic ribosomes, but which can be converted by removal of the linker into a protein having .alpha. and .beta. fragments and being capable of substantially inactivating eukaryohic ribosomes, wherein the .alpha. fragment has the amino acid sequence of residues 17 to 161 of SEQ ID NO:2 and the .beta. fragment has the amino acid sequence of residues 187 to 287 of SEQ ID NO;2.
- 2. An isolated DNA sequence encoding a protein being capable of substantially inactivating eukaryotic ribosomes, said protein having an amino acid sequence selected from the group consisting of SEQ ID NOS: 7, 9, 11, 13, 15 17, 19, 21, 23, and 25.
- 3. An isolated DNA comprising a DNA sequence selected from the group consisting of SEQ ID NOS:6, 8, 10, 12, 14, 16, 18, 20, 22, and 24.
- 4. A DNA isolate encoding a protein, termed a pro-Ribosome Inactivating Protein (proRIP), comprising a selectively removable, internal peptide linker sequence and is incapable of substantially inactivating eukaryotic ribosomes, but it can be converted by removal of the linker into a protein having .alpha. and .beta. fragments, termed a RIP, that is capable of substantially inactivating eukaryotic ribosomes, said proRIP wherein (1) the RIP is selected from the group consisting of Barley Translation Inhibitor (SEQ ID NO:26), Ricin A-chain RIP (SEQ ID NO:27), Abrin-A A-chain (SEQ ID NO:71), Saporin (SEQ ID NO:72), SLT-1 RIP (SEQ ID NO:73), Trichosanthin (SEQ ID NO:74), Luffin-A (SEQ ID NO:75), MAP (SEQ ID NO:76), Ricinus commahis agglutinin (SEQ ID NO:77), Momordin (SEQ ID NO:78), PAP-S (SEQ ID NO:79), buffin-B (SEQ ID NO:80), and Dianthin 30 (SEQ ID NO:81), (2) a removable, internal peptide linker sequence that inhibits RIP activity and is at least 70% homologous to residues 162-186 of SEQ ID NO:2, (3) the proRIP is generated by inserting the linker peptide of (2) into a selected sequence of (1), and is inserted into said selected sequence of (1) in between any two amino acid residues within the following sequences: amino acid residues 148-158 of Barley Translation Inhibitor (SEQ ID NO:26), amino acid residues 152-162 of Ricin A-chain RIP (SEQ ID NO:27), amino acid residues 138-148 of Abrin-A A-chain (SEQ ID NO:71), amino acid residues 153-163 of Saporin (SEQ ID NO:72), amino acid residues 145-155 of SLT 1 RIP (SEQ ID NO:73), antino acid residues 139-149 of Trichosanthin (SEQ ID NO:74), amino acid residues 138-148 of Luffin-A (SEQ ID NO:75), amino acid residues 145-155 of MAP (SEQ. ID NO:76), amino acid residues 152-162 of Rioinus communis agglutinin (SEQ ID NO:77), amino acid residues 138-148 of Momordin (SEQ ID NO:78), amino acid residues 151-161 of PAP-S (SEQ ID NO:79), amino acid residues 139-149 of Luffin-B (SEQ ID NO:80), and amino acid residues 174-184 of Dianthin 30 (SEQ ID NO:81).
- 5. A biologically functional expression vehicle containing the DNA isolate of claim 1.
- 6. A host cell transformed with a biologically functional expression vehicle of claim 5.
- 7. The transformed host cell of claim 6, wherein the host cell is a eukaryotic cell.
- 8. The host cell of claim 7, wherein the host cell is maize.
- 9. A method of making a protein incapable of substantially inactivating eukaryotic ribosomes, termed a proRIP, said method comprising the steps
- (a) providing a first DNA sequence encoding a RIP having at least one restriction site engineered therein,
- (b) cleaving the first DNA with a restriction enzyme to form first DNA subsequences,
- (c) providing a second DNA isolate encoding a polypeptide of nucleic acid coding sequence for amino acid residues 162-186 of SEQ ID:2 or a 70% homologous sequence that displays inhibition activity, and having ends ligatable with the cleaved ends of the first DNA subsequences,
- (d) ligating the first DNA subsequences and the second DNA to form a third DNA sequence capable of expressing a proRIP, and
- (e) expressing the proRIP.
Parent Case Info
This is a Divisional of U.S. Ser. No. 378,761 which was filed on Jan. 26, 1995 which was a continuation application of U.S. Ser. No. 987,927 filed Dec. 9, 1992, which is now abandoned, which was a continuation-in-part of U.S. Ser. No. 535,636 filed Jun. 11, 1990 which is now U.S. Pat. No. 5,248,606.
Divisions (1)
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Number |
Date |
Country |
Parent |
378761 |
Jan 1995 |
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Continuations (1)
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Number |
Date |
Country |
Parent |
987927 |
Dec 1992 |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
535636 |
Jun 1990 |
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