Proteins and peptides

C - Chemistry – Metallurgy – 12 – N

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Details

C12N 15/82 (2006.01) A01H 5/00 (2006.01) C07K 14/415 (2006.01) A01N 65/00 (2006.01)

Patent

CA 2378432

An antimicrobial protein or peptide derived from a plant defensin, or a derivative thereof, characterised in that said protein or peptide comprises one or more of the following replacement amino acid residues selected from the group consisting of: (i) a tryptophan residue at position 32; (ii) a valine, leucine, isoleucine, tryptophan, phenylalanine, lysine, arginine, tyrosine, methionine, cysteine or histidine residue at position 34; (iii) an isoleucine, tryptophan, lysine, arginine, valine, leucine, phenylalanine or histidine residue at position 35; (iv) a tryptophan residue at position 36; (v) a tryptophan, glycine, threonine, tyrosine, glutamine, lysine, arginine, phenylalanine or histidine residue at position 37; (vi) a leucine, isoleucine, tryptophan, phenylalanine, valine or cysteine residue at position 38; (vii) a leucine, isoleucine, tryptophan, phenylalanine, methionine, lysine, arginine, tyrosine or histidine residue at position 39; (viii) a tryptophan residue at position 40; (ix) an isoleucine, a tryptophan, phenylalanine, serine, threonine, tyrosine, glutamine, asparagine, lysine, arginine, histidine at position 41; and/or (x) a valine, leucine, isoleucine, tryptophan, phenylalanine, tyrosine, asparagine, lysine, arginine, serine or threonine residue at position 42; where said amino acid residues are not found naturally at said positions in the antimicrobial protein or peptide, with the proviso that the antimicrobial proteins do not comprise only a replacement arginine residue at position 37, 39 or 42. These proteins or peptides are useful in agriculture and pharmaceuticals.

L'invention concerne une protéine ou un peptide antimicrobiens dérivés d'une défensine de plante ou d'un de ses dérivés, caractérisés en ce que ladite protéine ou ledit peptide comporte un ou plusieurs des résidus d'acides aminés de remplacement suivants, sélectionnés dans le groupe comportant : (i) un résidu de trytophane à la position 32; (ii) un résidu de valine, leucine, isoleucine, tryptophane, phénylalanine, lysine, arginine, tyrosine, méthionine, cystéine ou histidine à la position 34; (iii) un résidu d'isoleucine, tryptophane, lysine, arginine, valine, leucine, phénylalanine ou histidine à la position 35; (iv) un résidu de tryptophane à la position 36; (v) un résidu de tryptophane, glycine, thréonine, tyrosine, glutamine, lysine, arginine, phénylalanine ou histidine à la position 37; (vi) un résidu de leucine, isoleucine, tryptophane, phénylalanine, valine ou cystéine à la position 38; (vii) un résidu de leucine, isoleucine, tryptophane, phénylalanine, méthionine, lysine, arginine, tyrosine ou histidine à la position 39; (viii) un résidu de tryptophane à la position 40; (ix) un résidu d'isoleucine, tryptophane, phénylalanine, sérine, thréonine, tyrosine, glutamine, asparagine, lysine, arginine, histidine à la position 41; et/ou (x) un résidu de valine, leucine, isoleucine, tryptophane, phénylalanine, tyrosine, asparagine, lysine, arginine, sérine ou thréonine à la position 42, lesdits résidus d'acides aminés ne se trouvant pas de façon naturelle auxdites positions dans la protéine ou le peptide antimicriobiens, avec la condition que les protéines antimicrobiennes ne comportent pas qu'un résidu d'arginine de remplacement aux positions 37, 39 ou 42. Ces protéines ou peptides sont utiles en agriculture et pharmaceutique.

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