Transgenic plants expressing l3 delta proteins are resistant to trichothecene fungal toxins

Abstract

Disclosed are specific mutants of L3 and transgenic plants that produce them. The plants exhibit increased resistance to fungal toxins that target ribosomal L3 protein. Also disclosed are transgenic plants that co-produce L3 mutant and an RIP protein, and exhibit increased resistance to various fungal toxins and viruses, while reducing toxicity normally associated with production of the RIP. Uses of the L3 mutants in animals are further disclosed.

1 . A transgenic plant comprising an exogenous nucleic acid comprising a transgene functional therein and that encodes a polypeptide fragment of L3, having at least the first 21 to about 99 N-terminal amino acid residues of a full-length eucaryotic L3 protein, or an analog of said polypeptide, wherein said plant does not contain a transgene encoding a ribosome inactivating protein (RIP) that targets an L3 eucaryotic protein, and wherein said plant exhibits increased resistance to toxins that target eucaryotic ribosomal L3 protein compared to a non-transgenic control plant. 
     
     
         2 . The transgenic plant of  claim 1 , wherein the transgene encodes a polypeptide fragment of L3 having from the first 21 to 99 N-terminal amino acid residues of a full-length ribosomal L3 protein. 
     
     
         3 . The transgenic plant of  claim 1 , wherein the transgene encodes a polypeptide fragment of L3 having amino acids 1-99 of a eucaryotic ribosomal L3 protein. 
     
     
         4 . The transgenic plant of  claim 1 , wherein the transgene encodes a polypeptide fragment of L3 having amino acids 1-100 of a eucaryotic ribosomal L3 protein. 
     
     
         5 . The transgenic plant of  claim 1 , wherein the transgene encodes a polypeptide fragment of L3 having amino acids 1-21 of a eucaryotic ribosomal L3 protein. 
     
     
         6 . The transgenic plant of  claim 1 , which is a monocot plant. 
     
     
         7 . The transgenic plant of  claim 1 , which is a cereal crop plant. 
     
     
         8 . The transgenic plant of  claim 7 , wherein the cereal crop plant is maize, rice, wheat, oat, barley or wheat. 
     
     
         9 . The transgenic plant of  claim 1 , which is a dicot plant. 
     
     
         10 . A transgenic seed derived from the transgenic plant of  claim 1 . 
     
     
         11 . A method of making a transgenic plant having increased resistance to infestation by fungi that produce toxins that target a eucaryotic L3 protein, comprising preparing a transgenic plant having a genome that contains an exogenous nucleic acid comprising a transgene encoding a polypeptide fragment of L3, having at least the first 21 to about 99 N-terminal amino acid residues of a full-length eucaryotic L3 protein or an analog thereof, wherein said plant does not contain a transgene encoding a ribosome inactivating protein (RIP) that targets an L3 eucaryotic protein, and wherein expression of the transgene in the transgenic plant confers increased resistance to toxins that target a eucaryotic ribosomal L3 protein compared to a non-transgenic control plant. 
     
     
         12 . The method of  claim 11 , wherein said preparing a transgenic plant comprises transforming a protoplast from a cell of a plant with the exogenous nucleic acid to produce a transformed protoplast, and generating the transgenic plant from the transformed protoplast. 
     
     
         13 . The method of  claim 11 , wherein said preparing a transgenic plant comprises introducing the exogenous nucleic acid into tissue of a plant to produce transformed plant tissue, and regenerating the transgenic plant from the transformed plant tissue.