Publication details

Structural insight into recognition of phosphorylated threonine-4 of RNA polymerase II C-terminal domain by Rtt103p

Authors

JASNOVIDOVA Olga KREJČÍKOVÁ Magdaléna KUBÍČEK Karel ŠTEFL Richard

Year of publication 2017
Type Article in Periodical
Magazine / Source EMBO reports
MU Faculty or unit

Central European Institute of Technology

Citation
Web http://embor.embopress.org/content/18/6/906
Doi http://dx.doi.org/10.15252/embr.201643723
Field Biochemistry
Keywords NMR; RNA processing; RNAPII CTD code; structural biology
Attached files
Description Phosphorylation patterns of the C-terminal domain (CTD) of largest subunit of RNA polymerase II (called the CTD code) orchestrate the recruitment of RNA processing and transcription factors. Recent studies showed that not only serines and tyrosines but also threonines of the CTD can be phosphorylated with a number of functional consequences, including the interaction with yeast transcription termination factor, Rtt103p. Here, we report the solution structure of the Rtt103p CTD-interacting domain (CID) bound to Thr4 phosphorylated CTD, a poorly understood letter of the CTD code. The structure reveals a direct recognition of the phospho-Thr4 mark by Rtt103p CID and extensive interactions involving residues from three repeats of the CTD heptad. Intriguingly, Rtt103p's CID binds equally well Thr4 and Ser2 phosphorylated CTD. A doubly phosphorylated CTD at Ser2 and Thr4 diminishes its binding affinity due to electrostatic repulsion. Our structural data suggest that the recruitment of a CID-containing CTD-binding factor may be coded by more than one letter of the CTD code.
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