| 摘要 |
The invention provides methods and compositions relating to interleukin 12 signal transducers, particularly an isolated human signal transducer and activator of transcription 4 (hStat 4), or a fragment thereof having an hStat 4-specific binding affinity, nucleic acids encoding hStat 4, which nucleic acids may be part of hStat 4-expression vectors and may be incorporated into a recombinant cell, agents which selectively bind hStat 4 or hStat 4 intracellular binding targets, or disrupt the binding of hStat 4 to such intracellular targets, methods of making such agents and hStat 4-specific binding targets in the form of cell surface proteins and nucleic acids. An hStat 4 drug screening assay involves forming mixtures of an hStat 4, an intracellular hStat 4 binding target, and a prospective agent at different concentrations. The mixtures are incubated to permit the binding of the intracellular hStat 4 binding target to the hStat 4 and the mixtures are then analyzed for the presence of such binding. A difference in such binding between the first and second mixtures indicates that the agent is capable of modulating the binding of hStat 4 to an intracellular hStat 4 binding target.
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