, Volume 236, Issue 2-3, pp 355-362

The consensus sequence of Kluyveromyces lactis centromeres shows homology to functional centromeric DNA from Saccharomyces cerevisiae

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The nucleotide sequences of five of the six centromeres of the yeast Kluyveromyces lactis were determined. Mutual comparison of these sequences led to the following consensus: a short highly conserved box (5′-ATCACGTGA-3′) flanked by an AT-rich (±90%) stretch of ± 160 by followed by another conserved box (5′-TNNTTTATGTTTCCGAAAATTAATAT-3′).

These three elements were named K1CDEI, K1CDEII, and K1CDEIII respectively, by analogy with the situation in Saccharomyces cerevisiae. In addition, a second 100 by AT-rich (±90%) element, named K1CDE0, was found ± 150 by upstream of K1CDEI. The sequences of both K1CDEI and K1CDEIII are highly conserved between K. lactis and S. cerevisiae; however, centromeres of K. lactis do not function in S. cerevisiae and vice versa. The most obvious differences between the centromeres of the two yeast species are the length of the AT-rich CDEII, which is 161–164 by in K. lactis versus 78–86 by in S. cerevisiae and the presence in K. lactis of K1CDEO, which is not found in S. cerevisiae.

Communicated by C.P. Hollenberg