Identification and partial purification of a protein binding to the human immunoglobulin kappa enhancer kappa E2 site.
We previously described a domain in the 5' half of the human immunoglobulin kappa enhancer which could bind nuclear proteins in vitro, as detected by a lambda exonuclease protection assay. A second more 3' binding domain in the enhancer has now been detected by a similar assay employing a different exonuclease, the T7 gene 6 exonuclease. Using this assay and starting with a pig spleen nuclear extract, we have purified 5000-fold a protein that binds to the 3' domain. In a DNase I footprint experiment the partially purified protein protects a 27 bp segment in the enhancer centered around the sequence CAGGTGGC, which corresponds to the kappa E2 sequence motif described in the mouse kappa enhancer. The protein, designated NF-kappa E2, also appears to bind at a position downstream of kappa E2, at or near the kappa E3 site. Proteins capable of binding at kappa E2 are found in several mammalian species and are expressed in both lymphoid and non-lymphoid tissues.
Gimble
J M
JM
Laboratory of Immunogenetics, National Institute of Allergy and Infectious Diseases, Bethesda, MD 20892.
Flanagan
J R
JR
Recker
D
D
Max
E E
EE
D000818:Animals; D001665:Binding Sites; D002846:Chromatography, Affinity; D002852:Chromatography, Ion Exchange; D004268:DNA-Binding Proteins / Q000302:isolation & purification* / Q000378:metabolism; D004742:Enhancer Elements, Genetic; D005092:Exonucleases; D005803:Genes, Immunoglobulin; D006801:Humans; D007145:Immunoglobulin kappa-Chains / Q000235:genetics*; D013154:Spleen / Q000032:analysis; D013552:Swine; D014157:Transcription Factors / Q000302:isolation & purification* / Q000378:metabolism; D014466:Ultraviolet Rays; D014764:Viral Proteins
D004268:DNA-Binding Proteins; D007145:Immunoglobulin kappa-Chains; D014157:Transcription Factors; D014764:Viral Proteins; D005092:Exonucleases