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KOW domain of Spt5, repeat 2 Spt5, an eukaryotic ortholog of NusG, contains multiple KOW motifs at its C-terminus. Spt5 is involved in transcription elongation and termination. KOW domain is known as an RNA-binding motif that is shared so far among some families of ribosomal proteins, the essential bacterial transcriptional elongation factor NusG, the eukaryotic chromatin elongation factor Spt5, the higher eukaryotic KIN17 proteins and Mtr4. KOW_Spt5 domains play critical roles in recruitment of multiple other eukaryotic transcription elongation and RNA biogenesis factors and additionally are involved in the binding of the eukaryotic Spt5 proteins to RNA polymerases.
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Jiyao W et al.(2023). "The conserved domain database in 2023.",