The elongation rate of RNA Polymerase II varies greatly between and along genes, as this enzyme accelerates from stable pausing to rapid elongation within genes, and is influenced by CG-content, exons and chromatin.
Cryo-EM structures of RNA polymerase I reveal considerable 'transformers-like' rearrangements where one subcomplex dissociates and is replaced by one domain of another subunit, possibly as an additional layer of transcriptional control.
Eva Torreira, Jaime Alegrio Louro ... Carlos Fernández-Tornero
Live-cell imaging, genetic analysis and electron cryomicroscopy identify structural motifs involved in the differential assembly of Pol I-Rrn3 complexes and Pol I homodimers in response to nutrient availability.
Mary Couvillion, Kevin M Harlen ... L Stirling Churchman
NET-seq analysis of 41 S. cerevisiae transcription regulatory factors uncovers their differential and opposing effects on Pol II transcription elongation and antisense transcription, revealing that wild-type transcription is balanced by the joint impact of many regulators.
Sofia Battaglia, Michael Lidschreiber ... Patrick Cramer
In vivo and in vitro elongation factor-RNA interaction data provide a missing link in understanding how processive elongation complexes are formed on active genes and disassembled at the end of genes.
Rajika L Perera, Rubben Torella ... Luca Pellegrini
The details of how the enzyme DNA polymerase α initiates the polymerization of nucleotides in DNA replication, a critical step in the synthesis of new chromosomal DNA, have been revealed in atomic detail.
The 24-nucleotide long siRNAs that guide cytosine methylation in Arabidopsis are made by dicing short double-stranded RNAs that are only around 30 nucleotides long.