Oxford University Innovation Ltd

Can M Buldun

Mark Howarth

The present invention relates to a polypeptide that is capable of promoting the covalent conjugation of two peptide tags or linkers and in particular to a polypeptide comprising: a) an amino acid sequence as set forth in SEQ ID NO: 1; or b) an amino acid sequence with at least 80% sequence identity to a sequence as set forth in SEQ ID NO: 1, wherein said amino acid sequence comprises a glutamic acid at position 61 and one or more of the following: 1) proline at position 66; 2) proline at position 95; 3) glycine at position 96; and 4) valine at position 97, wherein the specified amino acid residues are at positions equivalent to the positions in SEQ ID NO: 1 and wherein said polypeptide is capable of promoting the formation of an isopeptide bond between the lysine residue at position 9 of SEQ ID NO: 2 and the asparagine residue at position 17 of SEQ ID NO: 3.

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Oxford, United Kingdom

Can M Buldun