Human ESCO1 (Eco1/Ctf7 ortholog), acetyltransferase domain in complex with acetyl-CoA

Experimental Data Snapshot

  • Resolution: 2.60 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.221 
  • R-Value Observed: 0.227 

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Sister Chromatid Cohesion Establishment Factor ESCO1 Operates by Substrate-Assisted Catalysis.

Kouznetsova, E.Kanno, T.Karlberg, T.Thorsell, A.G.Wisniewska, M.Kursula, P.Sjogren, C.Schuler, H.

(2016) Structure 24: 789-796

  • DOI: https://doi.org/10.1016/j.str.2016.03.021
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Sister chromatid cohesion, formed by the cohesin protein complex, is essential for chromosome segregation. In order for cohesion to be established, the cohesin subunit SMC3 needs to be acetylated by a homolog of the ESCO1/Eco1 acetyltransferases, the enzymatic mechanism of which has remained unknown. Here we report the crystal structure of the ESCO1 acetyltransferase domain in complex with acetyl-coenzyme A, and show by SAXS that ESCO1 is a dimer in solution. The structure reveals an active site that lacks a potential catalytic base side chain. However, mutation of glutamate 789, a surface residue that is close to the automodification target lysine 803, strongly reduces autoacetylation of ESCO1. Moreover, budding yeast Smc3 mutated at the conserved residue D114, adjacent to the cohesion-activating acetylation site K112,K113, cannot be acetylated in vivo. This indicates that ESCO1 controls cohesion through substrate-assisted catalysis. Thus, this study discloses a key mechanism for cohesion establishment.

  • Organizational Affiliation

    Structural Genomics Consortium and Department of Medical Biochemistry and Biophysics, Karolinska Institutet, 17177 Stockholm, Sweden.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
N-acetyltransferase ESCO1
A, B
206Homo sapiensMutation(s): 0 
Gene Names: EFO1ESCO1KIAA1911
EC: 2.3.1
UniProt & NIH Common Fund Data Resources
Find proteins for Q5FWF5 (Homo sapiens)
Explore Q5FWF5 
Go to UniProtKB:  Q5FWF5
GTEx:  ENSG00000141446 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ5FWF5
Sequence Annotations
  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Resolution: 2.60 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.221 
  • R-Value Observed: 0.227 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 66.333α = 90
b = 66.333β = 90
c = 211.201γ = 90
Software Package:
Software NamePurpose
MxCuBEdata collection
XDSdata reduction
XSCALEdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2015-04-08
    Type: Initial release
  • Version 1.1: 2016-05-04
    Changes: Database references
  • Version 1.2: 2016-05-18
    Changes: Database references