Rpn4p acts as a transcription factor by binding to PACE, a nonamer box found upstream of 26S proteasomal and other genes in yeast
We identified a new, unique upstream activating sequence (5′-GGTGGCAAA-3′) in the promoters of 26 out of the 32 proteasomal yeast genes characterized to date, which we propose to call proteasome-associated control element. By using the one-hybrid method, we show that the factor binding to the protea...
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Veröffentlicht in: | FEBS letters 1999-04, Vol.450 (1), p.27-34 |
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Sprache: | eng |
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Zusammenfassung: | We identified a new, unique upstream activating sequence (5′-GGTGGCAAA-3′) in the promoters of 26 out of the 32 proteasomal yeast genes characterized to date, which we propose to call proteasome-associated control element. By using the one-hybrid method, we show that the factor binding to the proteasome-associated control element is Rpn4p, a protein containing a C2H2-type finger motif and two acidic domains. Electrophoretic mobility shift assays using proteasome-associated control element sequences from two regulatory proteasomal genes confirmed specific binding of purified Rpn4p to these sequences. The role of Rpn4p to function as a transregulator in yeast is corroborated by its ability of stimulating proteasome-associated control element-driven
lacZ expression and by experiments using the
RPT4 and
RPT6 gene promoters coupled to the bacterial
cat gene as a reporter. Additionally, we found the proteasome-associated control element to occur in a number of promoters to genes which are related to the ubiquitin-proteasome pathway in yeast. |
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ISSN: | 0014-5793 1873-3468 |
DOI: | 10.1016/S0014-5793(99)00467-6 |