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. 1987 Jul;84(14):4939–4943. doi: 10.1073/pnas.84.14.4939

Sequence-specific interactions of nuclear factors with conserved sequences of human class II major histocompatibility complex genes.

K Miwa, C Doyle, J L Strominger
PMCID: PMC305222  PMID: 3037529

Abstract

All class II major histocompatibility complex genes contain two highly conserved sequences, termed X and Y, within the promoter regions(s), which may have a role in regulation of expression. To study trans-acting factors that interact with these sequences, sequence-specific DNA binding activity has been examined by the gel electrophoresis retardation assay using the HLA-DQ2 beta gene 5' flanking DNA and nuclear extracts derived from various cell types. Several specific protein-binding activities were found using a 45-base-pair (bp) HinfI/Sau96I (-142 to -98 bp) and a 38-bp Sau96I/Sau96I (-97 to -60 bp) fragment, which include conserved sequence X (-113 to -100 bp) and conserved sequence Y (-80 to -71 bp), respectively. Competition experiments, methylation interference analysis, and DNase I foot-printing demonstrated that distinct proteins in a nuclear extract of Raji cells (a human B lymphoma line) bind to sequence X, to sequence Y, and to DNA 5' of the X sequence (termed sequence W). The factor binding site in the W sequence is also found to be conserved among beta-chain genes and is suggested to be a gamma-interferon control region.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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