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Research Papers
Department of Pharmacology, University of California, San Diego, School of Medicine, La Jolla 92093-0636.
JunB differs considerably from c-Jun in its ability to activate AP-1-responsive genes and induce oncogenic transformation. We demonstrate that the decreased ability of JunB to activate gene expression is the result of a small number of amino acid changes between its DNA-binding and dimerization motifs and the corresponding regions of c-Jun. These changes lead to a 10-fold decrease in the DNA-binding activity of JunB. JunB can be converted into a c-Jun-like activator by substituting four amino acids in its DNA-binding and dimerization motifs with the corresponding c-Jun sequences. JunB can also attenuate trans-activation by c-Jun, an activity mediated by its leucine zipper. This ability depends on two glycine residues that decrease the stability of the JunB leucine zipper, resulting in decreased homodimerization and increased heterodimerization. These results illustrate how small changes in primary structure, including chemically conservative changes, can result in functional divergence of two highly related transcriptional regulators.
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