Crystal structure of DCoH2 S51T

  • Classification: LYASE
  • Organism(s): Mus musculus
  • Expression System: Escherichia coli
  • Mutation(s): Yes 

  • Deposited: 2014-09-26 Released: 2014-12-31 
  • Deposition Author(s): Wang, D., Rose, R.B.
  • Funding Organization(s): National Science Foundation (NSF, United States)

Experimental Data Snapshot

  • Resolution: 1.36 Å
  • R-Value Free: 0.175 
  • R-Value Work: 0.158 
  • R-Value Observed: 0.159 

wwPDB Validation   3D Report Full Report

This is version 1.6 of the entry. See complete history


Interactions with the Bifunctional Interface of the Transcriptional Coactivator DCoH1 Are Kinetically Regulated.

Wang, D.Coco, M.W.Rose, R.B.

(2015) J Biol Chem 290: 4319-4329

  • DOI: https://doi.org/10.1074/jbc.M114.616870
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Pterin-4a-carbinolamine dehydratase (PCD) is a highly conserved enzyme that evolved a second, unrelated function in mammals, as a transcriptional coactivator. As a coactivator, PCD is known as DCoH or dimerization cofactor of the transcription factor HNF-1. These two activities are associated with a change in oligomeric state: from two dimers interacting as an enzyme in the cytoplasm to a dimer interacting with a dimer of HNF-1 in the nucleus. The same interface of DCoH forms both complexes. To determine how DCoH partitions between its two functions, we studied the folding and stability of the DCoH homotetramer. We show that the DCoH1 homotetramer is kinetically trapped, meaning once it forms it will not dissociate to interact with HNF-1. In contrast, DCoH2, a paralog of DCoH1, unfolds within hours. A simple mutation in the interface of DCoH2 from Ser-51 to Thr, as found in DCoH1, increases the kinetic stability by 9 orders of magnitude, to τ(½) ∼ 2 million years. This suggests that the DCoH1·HNF-1 complex must co-fold to interact. We conclude that simple mutations can dramatically affect the dissociation kinetics of a complex. Residue 51 represents a "kinetic hot spot" instead of a "thermodynamic hot spot." Kinetic regulation allows PCD to adopt two distinct functions. Mutations in DCoH1 associated with diabetes affect both functions of DCoH1, perhaps by disrupting the balance between the two DCoH complexes.

  • Organizational Affiliation

    From the Department of Molecular and Structural Biochemistry, North Carolina State University, Raleigh, North Carolina 27695-7622 bob_rose@ncsu.edu.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Pterin-4-alpha-carbinolamine dehydratase 2
A, B
105Mus musculusMutation(s): 1 
Gene Names: Pcbd2Dcoh2Dcohm
Find proteins for Q9CZL5 (Mus musculus)
Explore Q9CZL5 
Go to UniProtKB:  Q9CZL5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9CZL5
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.36 Å
  • R-Value Free: 0.175 
  • R-Value Work: 0.158 
  • R-Value Observed: 0.159 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 57.729α = 90
b = 57.729β = 90
c = 115.064γ = 120
Software Package:
Software NamePurpose

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Science Foundation (NSF, United States)United StatesMCB-0643830

Revision History  (Full details and data files)

  • Version 1.0: 2014-12-31
    Type: Initial release
  • Version 1.1: 2015-01-14
    Changes: Database references
  • Version 1.2: 2015-02-25
    Changes: Database references
  • Version 1.3: 2017-09-06
    Changes: Author supporting evidence, Database references, Derived calculations, Other, Source and taxonomy
  • Version 1.4: 2017-09-27
    Changes: Data collection
  • Version 1.5: 2019-11-27
    Changes: Author supporting evidence
  • Version 1.6: 2023-09-27
    Changes: Data collection, Database references, Refinement description