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- W4238785539 abstract "PU.1 is a B-cell- and macrophage-specific transcription factor. By an electrophoretic mobility shift assay and dimethyl sulfate methylation interference assays, we show that PU.1 binds to DNA sequences within the immunoglobulin kappa 3' enhancer (kappa E3'). Binding of PU.1 to the kappa E3' enhancer assists the binding of a second tissue-restricted factor, NF-EM5, to an adjacent site. Binding of NF-EM5 to kappa E3' DNA sequences requires protein-protein interaction with PU.1 as well as specific protein-DNA interactions. This is the first known instance of PU.1 interacting with another cellular protein. NF-EM5 does not cofractionate with PU.1, suggesting that it is a distinct protein and is not a posttranslational modification of PU.1. UV-crosslinking studies and elution from sodium dodecyl sulfate-polyacrylamide gels indicate that NF-EM5 is a protein of approximately 46 kDa. Site-directed mutagenesis studies of the PU.1- and EM5-binding sites indicate that these sites play important roles in kappa E3' enhancer activity. By using a series of PU.1 deletion constructs, we have identified a region in PU.1 that is necessary for interaction with NF-EM5. This segment encompasses a 43-amino-acid region with PEST sequence homology, i.e., one that is rich in proline (P), glutamic acid (E), serine (S), and threonine (T)." @default.
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- W4238785539 date "1992-01-01" @default.
- W4238785539 modified "2023-09-27" @default.
- W4238785539 title "PU.1 recruits a second nuclear factor to a site important for immunoglobulin kappa 3' enhancer activity" @default.
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- W4238785539 doi "https://doi.org/10.1128/mcb.12.1.368-378.1992" @default.
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