Abstract
The centromere DNA element I (CDEI) is an important component of Saccharomyces cerevisiae centromere DNA and carries the palindromic sequence CACRTG (R = purine) as a characteristic feature. In vivo, CDEI is bound by the helix-loop-helix protein CPF1. This article describes the in vivo analysis of all single-base-pair substitutions in CDEI in the centromere of an artificial chromosome and demonstrates the importance of the palindromic sequence for faithful chromosome segregation, supporting the notion that CPF1 binds as a dimer to this binding site. Mutational analysis of two conserved base pairs on the left and two nonconserved base pairs on the right of the CDEI palindrome revealed that these are also relevant for mitotic CEN function. Symmetrical mutations in either half-site of the palindrome affect centromere activity to a different extent, indicating nonidentical sequence requirements for binding by the CPF1 homodimer. Analysis of double point mutations in CDEI and in CDEIII, an additional centromere element, indicate synergistic effects between the DNA-protein complexes at these sites.
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