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- Terminal amine isotopic labeling of substrates (TAILS) is a method in quantitative proteomics that identifies the protein content of samples based on N-terminal fragments of each protein (N-terminal peptides) and detects differences in protein abundance among samples. Like other methods based on N-terminal peptides, this assay uses trypsin to break proteins into fragments and separates the N-terminal peptides (the fragments containing the N-termini of the original proteins) from the other fragments (internal tryptic peptides). TAILS isolates the N-terminal peptides by identifying and removing the internal tryptic peptides. This negative selection allows the TAILS method to detect all N-termini in the given samples. Alternative methods that rely on the free amino group of the N-terminus to identify the N-terminal peptides cannot detect some N-termini because they are "naturally blocked" (i.e. the natural protein does not have a free amino group). The TAILS method has a number of applications including the identification of new substrates and proteases (including those that have an unknown and broad specificity) and as a way to define the termini of proteins that enables protein annotation. TAILS can also be used to link proteases with a variety of defined biological pathways in diseases such as cancer, in order to gain a clearer understanding of the substrates and proteases involved in the disease state. (en)
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- Terminal amine isotopic labeling of substrates overview (en)
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- TAILS Procedure Overview. Numbers in red identify steps in the text. (en)
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- why does lack of independence mean they cannot be averaged and why is this bad? (en)
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- Terminal amine isotopic labeling of substrates (TAILS) is a method in quantitative proteomics that identifies the protein content of samples based on N-terminal fragments of each protein (N-terminal peptides) and detects differences in protein abundance among samples. (en)
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- Terminal amine isotopic labeling of substrates (en)
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