Abstract
Electrophoretic Mobility (EMSA), using oligonucleotides containing CCAAT box sequences from the murine Idhc promoter show the presence of CCAAT binding proteins in nuclear extracts from liver and testis. In a liver extract, a single shifted band is seen. However, in the testis extract, two shifts are observed, one of which may be due to a testis specific isoform of CCAAT binding factor (CBF). Southwestern analysis with an oligonucleotide probe containing these sequences reveals the presence of a protein of approximately 120 kD in the testis extract. In the liver extract, a 70-kD protein binds the probe. An antibody against HeLa CBF causes a supershift in testis nuclear extract.
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