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. 1989 Dec;9(12):5585–5593. doi: 10.1128/mcb.9.12.5585

Purification of a protein binding to the CDEI subregion of Saccharomyces cerevisiae centromere DNA.

W D Jiang 1, P Philippsen 1
PMCID: PMC363728  PMID: 2685569

Abstract

The DNA subregions CDEI and CDEIII of Saccharomyces cerevisiae centromeres are highly conserved, and both are binding sites for proteins. We describe here the purfication of a CDEI-specific binding protein using biotin-labeled synthetic CDEI DNA coupled to streptavidin agarose. The binding properties of this 64-kilodalton (kDa) protein were characterized by competition assays and by methylation interference assays. DNA fragments with single base-pair changes at positions 7 and 8 of CDEI were less efficient competitors than fragments with nonmutated CDEI. Mutations at these positions have previously been shown to decrease centromere activity in vivo. Methylation of guanosines at either side of the 8-base-pair CDEI sequence did not interfere with binding, whereas methylation of any of the four guanosines within CDEI prevented binding. A smaller CDEI-specific binding protein of 37 kDa was also purified and characterized. It is most likely a degradation product of the 64-kDa protein.

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