Abstract
The expression of HLA class II genes is regulated by a series of cis-acting elements and trans-acting factors. Several cis-acting elements have been identified and have been termed the Z box, X box, Y box, octamer, and "TATA" box. The Y box contains an inverted CCAAT box. By probing a phage lambda gt11 library with double-stranded oligonucleotides, we have directly isolated a cDNA encoding a Y box-binding protein designated YB-1. YB-1 binding has an absolute requirement for the CCAAT box and relative specificity for the Y box. It has a Mr of 35,414, contains 18% basic residues, and contains putative nuclear localization signals. An inverse correlation of YB-1 and HLA-DR beta chain mRNA levels suggests that YB-1 is a negative regulatory factor.
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