Add time:09/10/2019         Source:sciencedirect.com

In all domains of life, elongating RNA polymerases require the assistance of accessory factors to maintain their processivity and regulate their rate. Among these elongation factors, the Spt5/NusG factors stand out. Members of this protein family appear to be the only transcription accessory proteins that are universally conserved across all domains of life. In archaea and eukaryotes, Spt5 associates with a second protein, Spt4. In addition to regulating elongation, the eukaryotic Spt4–Spt5 complex appears to couple chromatin modification states and RNA processing to transcription elongation. This review discusses the experimental bases for our current understanding of Spt4–Spt5 function and recent studies that are beginning to elucidate the structure of Spt4–Spt5/RNA polymerase complexes and mechanism of Spt4–Spt5 action. This article is part of a Special Issue entitled: RNA polymerase II Transcript Elongation.

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