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pho | Polycomb protein PHO; Polycomb group (PcG) protein that binds to the 5'- CNGCCATNNNNG-3' sequence found in the regulatory regions of many genes. PcG proteins act by forming multiprotein complexes, which are required to maintain the transcriptionally repressive state of homeotic genes throughout development. PcG proteins are not required to initiate repression, but to maintain it during later stages of development. They probably act via the methylation of histones, rendering chromatin heritably changed in its expressibility. Probably targets the Esc/E(z) complex to DNA. Necessary but no [...] (520 aa) | ||||
WRNexo | Werner Syndrome-like exonuclease; WRN exonuclease (WRNexo) encodes a 3'-5' exonuclease that cleaves 3' ends of both single-stranded and duplex DNA substrates that resemble DNA structures present during DNA replication. It may act in concert with RecQ family helicases to resolve Holliday junctions or other unusual DNA structures. It is likely to be involved in DNA replication, recombination and repair, and is essential for early embryonic development. (354 aa) |