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Enzymatic cleavage and HPLC peptide mapping of proteins

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Abstract

Detailed procedures are described for successfully digesting reasonably small quantities (i.e., usually >10 pmol) of proteins with a variety of proteases and for then isolating the resulting peptides by reversephase HPLC. Since sodium dodecyl sulfate-polyacrylamide, gel electrophoresis (SDS-PAGE) appears to be the current method of choice for final purification of proteins for structural analysis, special attention is given to carrying out in-gel proteolytic digests on SDS-PAGE-separated proteins that have usually been stained with Coomassie Blue. A compilation of data from nearly 200 “unknown” samples is used to help provide realistic expectations with respect to the results that are likely to be obtained from carrying out in-gel proteolytic digests on large numbers of proteins.

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Correspondence to Kenneth R. Williams.

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Williams, K.R., Stone, K.L. Enzymatic cleavage and HPLC peptide mapping of proteins. Mol Biotechnol 8, 155–167 (1997). https://doi.org/10.1007/BF02752260

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