Patent ID: 8361740
Filing Date: 2013-01-29
Classification: C07B,C07K,G01N

Abstract:
1. A method for making a peptide standard for mass spectrometry said method comprising (a) identifying endopeptidase cleavage sites in a parent polypeptide sequence of interest; (b) selecting peptide sequences from said parent polypeptide which are defined by the endopeptidase cleavage sites of step (a), (c) adding a C-terminal extension to each selected sequence, wherein if the endopeptidase cleavage site is C-terminal to its recognition sequence then the C-terminal extension comprises 1 to 6 amino acids, wherein if the endopeptidase cleavage site is N-terminal to its recognition sequence then the C-terminal extension comprises said recognition sequence, wherein if the endopeptidase cleavage site is within its recognition sequence then the C-terminal extension comprises the remainder of said recognition sequence C-terminal to the cleavage site; and (d) synthesising a peptide having the extended amino acid sequence of step (c).