Abstract
For study of the molecular basis of regulation of proteasome gene expression, we isolated the gene encoding the α-type HC8 subunit of the human proteasome. About 2.3 kb of the 5′ flanking region of this gene was tested for promoter function by chloramphenicol acetyltransferase assay. This analysis revealed that CAAT and TATA boxes, but not a GC box, are essential for its promoter activity. These results differed from previous findings that the genes for the α-type HC3 and β-type HC5 subunits of the human proteasome have a TATA-less promoter and that two or three GC boxes function as the promoter sequences (Tamura, T. et al. (1994) J. Mel. Biol. 244, 1117-1124). We mapped the HC8 gene at q23 on human chromosome 14, which differs from the chromosomal locations of nine other proteasomal subunit genes mapped so far.
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