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. 1992 Aug;12(8):3573–3582. doi: 10.1128/mcb.12.8.3573

The yeast alpha 1 and MCM1 proteins bind a single strand of their duplex DNA recognition site.

E J Grayhack 1
PMCID: PMC364623  PMID: 1630462

Abstract

The yeast cell type regulator alpha 1 cooperates with a constitutive factor, MCM1 protein, to recognize the promoter and activate transcription of several alpha-specific genes. I show here that the alpha 1 and MCM1 proteins bind specifically to one of the two strands of their recognition sequence. This single-strand-binding activity shares several characteristics with the duplex-binding properties of these proteins: (i) the MCM1 protein binds alone to single-stranded and duplex sequences of both the alpha-specific (P'Q) and a-specific (P) binding sites; (ii) the alpha 1 protein requires both the MCM1 protein and the Q sequence to bind either single-stranded or duplex DNA; (iii) the alpha 1 protein stimulates binding of the MCM1 protein to both single-stranded and duplex DNAs; and (iv) the affinities of the proteins for single-stranded and duplex DNAs are comparable.

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