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Nucleic Acids Research, 1988, Vol. 16, No. 17 8433-8442
© 1988

Articles

Mitochondrial DNA of the yeast Kluyveromyces: guanine—cytosine rich sequence clusters

Antonella Ragnini and Hiroshi Fukuhara*

Institut Curie, Section de Biologie, Bâtiment 110, Centre Universitaire Orsay 91406, France

*To whom correspondence should be addressed

Received June 8, 1988. Revised July 29, 1988. Accepted July 29, 1988.

Mitochondrial DNA from the yeast Kluyveromyces marxianus var. lactis (K.lactis) is a circular molecule of 39 kilobase-pairs. A genetic and physical map was constructed. We found that this genome contained a large number of guanine-cytosine(GC)-rich sequence clusters, many of which are characterized by the presence of SacII restriction sites (CCGCGG). The primary sequence of the GC clusters often showed a palindromic structure. These GC clusters were present in several varieties of K.marxianus, but not in others. The presence of these clusters is a major feature that distinguishes K.lactis strains from those of K.marxianus var. marxianus (including K.fraqilis).


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