Crystal structure of the TCERG1 FF4-6 tandem repeat domain

Experimental Data Snapshot

  • Resolution: 2.00 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.189 
  • R-Value Observed: 0.192 

wwPDB Validation   3D Report Full Report

This is version 1.3 of the entry. See complete history


Specific Interaction of the Transcription Elongation Regulator TCERG1 with RNA Polymerase II Requires Simultaneous Phosphorylation at Ser2, Ser5, and Ser7 within the Carboxyl-terminal Domain Repeat.

Liu, J.Fan, S.Lee, C.J.Greenleaf, A.L.Zhou, P.

(2013) J Biol Chem 288: 10890-10901

  • DOI: https://doi.org/10.1074/jbc.M113.460238
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The human transcription elongation regulator TCERG1 physically couples transcription elongation and splicing events by interacting with splicing factors through its N-terminal WW domains and the hyperphosphorylated C-terminal domain (CTD) of RNA polymerase II through its C-terminal FF domains. Here, we report biochemical and structural characterization of the C-terminal three FF domains (FF4-6) of TCERG1, revealing a rigid integral domain structure of the tandem FF repeat that interacts with the hyperphosphorylated CTD (PCTD). Although FF4 and FF5 adopt a classical FF domain fold containing three orthogonally packed α helices and a 310 helix, FF6 contains an additional insertion helix between α1 and α2. The formation of the integral tandem FF4-6 repeat is achieved by merging the last helix of the preceding FF domain and the first helix of the following FF domain and by direct interactions between neighboring FF domains. Using peptide column binding assays and NMR titrations, we show that binding of the FF4-6 tandem repeat to the PCTD requires simultaneous phosphorylation at Ser(2), Ser(5), and Ser(7) positions within two consecutive Y(1)S(2)P(3)T(4)S(5)P(6)S(7) heptad repeats. Such a sequence-specific PCTD recognition is achieved through CTD-docking sites on FF4 and FF5 of TCERG1 but not FF6. Our study presents the first example of a nuclear factor requiring all three phospho-Ser marks within the heptad repeat of the CTD for high affinity binding and provides a molecular interpretation for the biochemical connection between the Ser(7) phosphorylation enrichment in the CTD of the transcribing RNA polymerase II over introns and co-transcriptional splicing events.

  • Organizational Affiliation

    Department of Biochemistry, Duke University Medical Center, Durham, North Carolina 27710, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Transcription elongation regulator 1
A, B
190Homo sapiensMutation(s): 0 
Gene Names: TCERG1CA150TAF2S
UniProt & NIH Common Fund Data Resources
Find proteins for O14776 (Homo sapiens)
Explore O14776 
Go to UniProtKB:  O14776
GTEx:  ENSG00000113649 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO14776
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.00 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.189 
  • R-Value Observed: 0.192 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 27.919α = 90
b = 77.087β = 96.01
c = 95.179γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
HKL-2000data scaling
HKL-2000data collection

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-02-27
    Type: Initial release
  • Version 1.1: 2013-05-15
    Changes: Database references
  • Version 1.2: 2019-07-17
    Changes: Data collection, Refinement description
  • Version 1.3: 2024-02-28
    Changes: Data collection, Database references, Derived calculations