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. 1992 Dec;66(12):6969–6978. doi: 10.1128/jvi.66.12.6969-6978.1992

Down-regulation of the major histocompatibility complex class I enhancer in adenovirus type 12-transformed cells is accompanied by an increase in factor binding.

R Ge 1, A Kralli 1, R Weinmann 1, R P Ricciardi 1
PMCID: PMC240338  PMID: 1433502

Abstract

In transformed cells, the E1A gene of adenovirus type 12 (Ad12) represses transcription of class I genes of the major histocompatibility complex. The tumorigenic potential of Ad12-transformed cells correlates with this diminished class I expression. In contrast, the E1A gene of the nontumorigenic Ad5 does not affect class I expression. We show here that a transfected reporter chloramphenicol acetyltransferase plasmid driven by an H-2K promoter (-1049 bp) was expressed at much lower levels in Ad12- than in Ad5-transformed mouse cells. Analysis of mutant constructs revealed that only 83 bp of H-2 DNA, consisting of the enhancer juxtaposed to the basal promoter, was sufficient for this differential expression. Whereas the H-2 basal promoter alone was somewhat less active in Ad12-transformed cells, the H-2 TATA box itself did not appear to be important. The H-2 enhancer proved to be the principal element in Ad12 E1A-mediated repression, since (i) substitution of the H-2 enhancer by simian virus 40 enhancers overcame the repression, and (ii) when juxtaposed to either its native or heterologous basal promoters, the H-2 enhancer was functional in Ad5- but not Ad12-transformed cells. Mobility shift assays showed that there is a DNA-binding activity to the 5' site (R2 element) of the enhancer that is significantly higher in Ad12- than in Ad5-transformed cells. These results suggest that decreased class I enhancer activity in Ad12-transformed cells may, at least in part, be due to the higher levels of an enhancer-specific factor, possibly acting as a repressor.

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Selected References

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