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Bre1 | E3 ubiquitin-protein ligase Bre1; E3 ubiquitin-protein ligase that mediates monoubiquitination of 'Lys-117' of histone H2B. H2B 'Lys-117' ubiquitination gives a specific tag for epigenetic transcriptional activation and is also prerequisite for histone H3 'Lys-4' and 'Lys-79' methylation. It thereby plays a central role in histone code and gene regulation. Required for the expression of Notch target genes in development by affecting the levels of Su(H) in imaginal disk cells and stimulating the Su(H)-mediated transcription of Notch-specific genes. Belongs to the BRE1 family. (1044 aa) | ||||
Ubc6 | Ubiquitin-conjugating enzyme E2-17 kDa; Catalyzes the covalent attachment of ubiquitin to other proteins. Required for postreplication repair of UV-damaged DNA. Involved in the negative regulation of the Ras/MAPK signaling pathway in the wing by acting with the putative E3 ligases poe, Kcmf1 and Ufd4 to mediate the ubiquitination and proteasomal degradation of rl/MAPK ; Belongs to the ubiquitin-conjugating enzyme family. (151 aa) |