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. 1986 Feb 25;14(4):1599–1614. doi: 10.1093/nar/14.4.1599

A human DNA-binding protein is methylation-specific and sequence-specific.

R Y Wang, X Y Zhang, M Ehrlich
PMCID: PMC339531  PMID: 3005977

Abstract

A nuclear protein isolated from human placenta, methylated DNA-binding protein (MDBP), binds selectively to DNA enriched in 5-methylcytosine. We now demonstrate that MDBP is a sequence-specific, as well as methylation-specific, DNA-binding protein. From ten restriction fragments of pBR322 DNA methylated with human DNA methyltransferase, one was bound to MDBP very much more strongly than any of the others. For this preferential binding to MDBP, the DNA had to be methylated. By a DNase I protection experiment (DNase I footprinting), a 22-base sequence within this methylated restriction fragment was shown to be specifically protected by MDBP. The sequence-specificity of MDBP coupled with its dependence on DNA methylation suggests that this is one of the proteins which modulates important functions of human DNA methylation in vivo.

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