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. 1991 Apr;10(4):981–985. doi: 10.1002/j.1460-2075.1991.tb08032.x

A single-stranded DNA binding protein from S. cerevisiae specifically recognizes the T-rich strand of the core sequence of ARS elements and discriminates against mutant sequences.

A M Schmidt 1, S U Herterich 1, G Krauss 1
PMCID: PMC452742  PMID: 2009863

Abstract

A protein named ssARS-T binding protein has been purified from yeast that specifically binds to the T-rich strand of the consensus core sequence of yeast autonomously replicating sequence (ARS) elements. As assayed from gel mobility shift experiments the ssARS-T protein shows characteristics of a sequence specific single-stranded DNA binding protein. The complementary A-rich strand of the ARS core sequence is bound much more weakly and no binding can be detected for the double-stranded form of the core sequence. Three single base substitutions in the core sequence that are known to abolish ARS function in vivo also lead to weaker binding of the core sequence to the ssARS-T protein in vitro. The strong correlation between the binding of mutated sequences in vitro and the ARS properties of these sequences in vivo points to an essential function of the ssARS-T protein during replication initiation in yeast ARS elements.

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