Abstract
Proteins capable of interacting with the enhancer of the immunoglobulin kappa gene in vitro have been detected in extracts of nuclei from human B cells and from human, mouse, and rabbit spleens. The experiments, based on an exonuclease protection technique, demonstrate nuclear protein factors binding to a 30- to 35-base-pair domain containing both the simian virus 40 enhancer core element (TTTCCA) and the octamer CAGGTGGC that was previously identified as the consensus sequence for protein-binding sites in the murine immunoglobulin heavy-chain enhancer. This 30- to 35-base-pair domain in the human kappa enhancer is homologous to a site of protein binding detected in the murine kappa enhancer by other investigators using a gel retardation assay. Our results complement in vivo dimethyl sulfate footprinting studies of the human immunoglobulin kappa enhancer which demonstrated B cell-specific changes in guanine reactivity immediately 5' to the consensus octamer. Together, these findings suggest that DNA-binding proteins in B-cell nuclei interact with the 5' portion of the human kappa-gene enhancer. Such proteins could play a role in the B cell-specific transcription of the human immunoglobulin kappa gene.
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Selected References
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