Promoter-specific co-activation by Drosophila mastermind.
Biochem Biophys Res Commun
; 377(2): 658-661, 2008 Dec 12.
Article
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| MEDLINE
| ID: mdl-18930034
ABSTRACT
Mastermind (Mam) is a co-activator protein of binary complexes consisting of Suppressor of Hairless (Su(H)) and Notch Intracellular Domain (NICD) proteins assembled on cis-regulatory regions of target genes activated by Notch signaling. Current evidence indicates that Mastermind is necessary and sufficient for the formation of a functional Su(H)/NICD/Mam ternary complex on at least one specific architecture of Su(H) binding sites, called the SPS element (Su(H) Paired Sites). However, using transcription assays with a combination of native and synthetic Notch target gene promoters in Drosophila cultured cells, we show here that co-activation of Su(H)/NICD complexes on SPS elements by Mam is promoter-specific. Our novel results suggest this promoter specificity is mediated by additional unknown cis-regulatory elements present in the native promoters that are required for the recruitment of Mam and formation of functional Su(H)/NICD/Mam complexes on SPS elements. Together, the findings in this study suggest Mam is not always necessary and sufficient for co-activation of binary Su(H)/NICD complexes on SPS elements.
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MEDLINE
Asunto principal:
Proteínas Represoras
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Proteínas Nucleares
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Regulación de la Expresión Génica
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Regiones Promotoras Genéticas
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Proteínas de Drosophila
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Drosophila melanogaster
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Receptores Notch
Límite:
Animals
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En
Revista:
Biochem Biophys Res Commun
Año:
2008
Tipo del documento:
Article