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Nucleic Acids Research, 1991, Vol. 19, No. 17 4701-4707
© 1991

MOLECULAR BIOLOGY

Altered response to growth rate changes in Kluyveromyces lactis versus Saccharomyces cerevisiae as demonstrated by heterologous expression of ribosomal protein 59 (CRY1)

Garry P. Larson1,2 and John J. Rossi2,*

1Department of Molecular Genetics, Beckman Research Institute City of Hope, Duarte, CA 91010 USA 2Department of Microbiology, University of California Los Angeles, CA 90024, USA

* To whom correspondence should be addressed

Received May 8, 1991. Revised July 20, 1991. Accepted July 20, 1991.

We report the cloning, characterization and preliminary analysis of the regulation of the gene coding for ribosomal protein 59 (RP59) from the budding yeast Kluyveromyces lactis. The RP59 gene is present as a single copy, contains an intron within the amino terminal coding portion of the gene, and harbors conserved S.cerevlslae splicing signals. Sequence elements upstream of the transcriptional start site are homologous to UASRPG, known to regulate the transcription of numerous genes in S.cerevislae via their interaction with the trans-activating factor RAP1. These elements are necessary for transcription of RP59 in both K.lactis and S.cerevlsiae hosts. UASRPG in S.cerevisiae rp genes also modulate the transcription of rp RNA synthesis in response to a growth rate upshift. In K.lactis, the RP59 gene does not respond to growth rate upshift. Reciprocal expression of RP59 and CRY1 in heterologous hosts demonstrates that glucose upshift occurs in S.cerevislae but not K.lactls. These results demonstrate that a factor or factors required for growth upshift are lacking In K.lactis, and provide further evidence that the UASRPG are sufficient signals for modulating this response.


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