Abstract：
:Post-translational modifications alter protein structure, affecting activity, stability, localization and/or binding partners. Antibodies that specifically recognize post-translationally modified proteins have a number of uses including immunocytochemistry and immunoprecipitation of the modified protein to purify protein-protein and protein-nucleic acid complexes. However, antibodies directed at modified sites on individual proteins are often nonspecific. Here we describe a protocol to purify polyclonal antibodies that specifically detect the modified protein of interest. The approach uses iterative rounds of subtraction and affinity purification, using stringent washes to remove antibodies that recognize the unmodified protein and low sequence complexity epitopes containing the modified amino acid. Dot blot and western blot assays are used to assess antibody preparation specificity. The approach is designed to overcome the common occurrence that a single round of subtraction and affinity purification is not sufficient to obtain a modified protein-specific antibody preparation. One full round of antibody purification and specificity testing takes 6 d of discontinuous time.
journal_name
Nat Protocjournal_title
Nature protocolsauthors
Arur S,Schedl Tdoi
10.1038/nprot.2014.017subject
Has Abstractpub_date
2014-02-01 00:00:00pages
375-95issue
2eissn
1754-2189issn
1750-2799pii
nprot.2014.017journal_volume
9pub_type
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