Crystal Structure of S. cerevisiae Ess1

Experimental Data Snapshot

  • Resolution: 2.40 Å
  • R-Value Free: 0.306 
  • R-Value Work: 0.269 
  • R-Value Observed: 0.271 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report

This is version 1.2 of the entry. See complete history


Structure analysis suggests Ess1 isomerizes the carboxy-terminal domain of RNA polymerase II via a bivalent anchoring mechanism.

Namitz, K.E.W.Zheng, T.Canning, A.J.Alicea-Velazquez, N.L.Castaneda, C.A.Cosgrove, M.S.Hanes, S.D.

(2021) Commun Biol 4: 398-398

  • DOI: https://doi.org/10.1038/s42003-021-01906-8
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Accurate gene transcription in eukaryotes depends on isomerization of serine-proline bonds within the carboxy-terminal domain (CTD) of RNA polymerase II. Isomerization is part of the "CTD code" that regulates recruitment of proteins required for transcription and co-transcriptional RNA processing. Saccharomyces cerevisiae Ess1 and its human ortholog, Pin1, are prolyl isomerases that engage the long heptad repeat (YSPTSPS) 26 of the CTD by an unknown mechanism. Here, we used an integrative structural approach to decipher Ess1 interactions with the CTD. Ess1 has a rigid linker between its WW and catalytic domains that enforces a distance constraint for bivalent interaction with the ends of long CTD substrates (≥4-5 heptad repeats). Our binding results suggest that the Ess1 WW domain anchors the proximal end of the CTD substrate during isomerization, and that linker divergence may underlie evolution of substrate specificity.

  • Organizational Affiliation

    Department of Biochemistry and Molecular Biology, SUNY-Upstate Medical University, Syracuse, NY, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Peptidyl-prolyl cis-trans isomerase ESS1
A, B
170Saccharomyces cerevisiaeMutation(s): 0 
Find proteins for P22696 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P22696 
Go to UniProtKB:  P22696
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP22696
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.40 Å
  • R-Value Free: 0.306 
  • R-Value Work: 0.269 
  • R-Value Observed: 0.271 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 110.098α = 90
b = 57.366β = 96.92
c = 69.334γ = 90
Software Package:
Software NamePurpose
SCALEPACKdata scaling
PDB_EXTRACTdata extraction
HKL-2000data reduction

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR01-GM123985
National Science Foundation (NSF, United States)United States1750462
National Institutes of Health/National Cancer Institute (NIH/NCI)United StatesR01-CA140522

Revision History  (Full details and data files)

  • Version 1.0: 2021-03-31
    Type: Initial release
  • Version 1.1: 2021-10-13
    Changes: Database references
  • Version 1.2: 2023-10-18
    Changes: Data collection, Refinement description