Reference: Löhning C and Ciriacy M (1994) The TYE7 gene of Saccharomyces cerevisiae encodes a putative bHLH-LZ transcription factor required for Ty1-mediated gene expression. Yeast 10(10):1329-39

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Abstract


In Saccharomyces cerevisiae, expression of a gene adjacent to the retrotransposon Ty1 is often mediated by Ty-internal sequences. We have identified novel mutants, tye7, which are affected in Ty1-mediated expression of ADH2 through a Ty1 sequence distal to the 5' long terminal repeat sequence. The TYE7 gene has been isolated and characterized. It encodes a 33 kDa protein whose N-terminal third is extremely rich in serine residues (28%). Within its C-terminal sequence, a remarkable similarity to Myc and Max proteins can be found. Thus, TYE7 is a potential member of the basic region/helix-loop-helix/leucine-zipper protein family. TYE7 function is not essential for growth. It may primarily function as a transcriptional activator in Ty1-mediated gene expression, as has been confirmed by the activation of reporter gene expression by a LexA-TYE7 hybrid protein. ADH2 activation by defined Ty1 derivatives revealed that TYE7 acts positively through the more distal Ty1 enhancer element (region D), and negatively in a region between A (the 5' proximal enhancer element) and D.

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Journal Article | Research Support, Non-U.S. Gov't
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Löhning C, Ciriacy M
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