Modification-specific antibodies are important tools to examine the dynamics and functions of posttranslational protein modifications in cells. Here, we describe in detail the generation of polyclonal antibodies specific for mono-, di-, and trimethylated lysine 51 within the HIV transactivator Tat. Lysine 51 is a highly conserved residue located in the RNA-binding region of Tat and the target of lysine methyltransferases KMT1E (SETDB1) and KMT7 (Set7/9). Using affinity-purified methyl-specific antibodies of Tat, we find that cellular Tat is predominantly monomethylated at lysine 51, a modification enhanced by coexpression of KMT7.
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| http://dx.doi.org/10.1016/j.ymeth.2010.07.001 | DOI Listing |
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