Open AccessCharacterization of promoter regions involved in high expression of KlCYC1
Author(s) -
Ramil Elvira,
FreirePicos M. Angeles,
Cerdán M. Esperanza
Publication year - 1998
Publication title -
european journal of biochemistry
Language(s) - English
Resource type - Journals
eISSN - 1432-1033
pISSN - 0014-2956
DOI - 10.1046/j.1432-1327.1998.2560067.x
Subject(s) - promoter , kluyveromyces lactis , activator (genetics) , gene , microbiology and biotechnology , transcription (linguistics) , biology , consensus sequence , binding site , transcription factor , psychological repression , genetics , gene expression , peptide sequence , saccharomyces cerevisiae , linguistics , philosophy
Functional analysis of the KlCYC1 promoter reveals that sequences located upstream to those already published [Freire‐Picos, M. A., Rodríguez‐Torres, A. M., Ramil, E., Cerdán, M. E., Breuning, K. D., Hollenberg, C. P. & Zitomer, R. S. (1993) Sequence of a cytochrome c from Kluyveromyces lactis and its upstream region, Yeast 9 , 201−204] and extending from positions −780 to −371 are important for maintaining high levels of expression, although this region contains both negative and positive elements. A consensus sequence for interaction with KlCpf1p is present at position −492, into the negative site, and specific protein binding to KlCpf1p has been demonstrated. Deletion of the sequences from positions −413 to −338 diminishes KlCYC1 transcription; protein binding to two sequences included in this activator region is detected and several points of evidence indicate that the complex observed is different from the Hap2/3/4/5p complex. Binding of KlCpf1p and the activator complex to the promoter is constitutive in different carbon sources. Although the promoter contains CCAAT boxes, directed mutagenesis has revealed that they are not related to the moderate de‐repression observed in glycerol media.