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bcd | Homeotic protein bicoid; Segment polarity protein that provides positional cues for the development of head and thoracic segments. Regulates the expression of zygotic genes, possibly through its homeodomain, and inhibits the activity of other maternal gene products. May also bind RNA. Interacts with Bin1 to repress transcription of bicoid target genes in the anterior tip of the embryo; a process known as retraction. (494 aa) | ||||
Hmt4-20 | Histone-lysine N-methyltransferase Suv4-20; Histone methyltransferase that specifically trimethylates 'Lys-20' of histone H4. H4 'Lys-20' trimethylation represents a specific tag for epigenetic transcriptional repression. Mainly functions in pericentric heterochromatin regions, thereby playing a central role in the establishment of constitutive heterochromatin in these regions. Acts as a dominant suppressor of position-effect variegation; Belongs to the class V-like SAM-binding methyltransferase superfamily. Histone-lysine methyltransferase family. Suvar4-20 subfamily. (1300 aa) |