1RU0

Crystal structure of DCoH2, a paralog of DCoH, the Dimerization Cofactor of HNF-1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.6 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.212 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Biochemical and structural basis for partially redundant enzymatic and transcriptional functions of DCoH and DCoH2

Rose, R.B.Pullen, K.E.Bayle, J.H.Crabtree, G.R.Alber, T.

(2004) Biochemistry 43: 7345-7355

  • DOI: 10.1021/bi049620t
  • Also Cited By: 3HXA

  • PubMed Abstract: 
  • An inherited form of diabetes, maturity-onset diabetes of the young type 3 (MODY3), results from mutations in the transcriptional activator, hepatocyte nuclear factor-1alpha (HNF1alpha). Transcription by HNF1alpha is stimulated by the bifunctional co ...

    An inherited form of diabetes, maturity-onset diabetes of the young type 3 (MODY3), results from mutations in the transcriptional activator, hepatocyte nuclear factor-1alpha (HNF1alpha). Transcription by HNF1alpha is stimulated by the bifunctional coactivator DCoH (dimerization cofactor of HNF1). Strikingly, an HNF1alpha deletion in mice causes more severe phenotypes than a DCoH deletion. It has been hypothesized that a DCoH homolog, DCoH2, partially complements the DCoH deletion. To test this idea, we determined the biochemical properties and the 1.6-A-resolution crystal structure of DCoH2. Like DCoH, DCoH2 forms a tetramer, displays pterin-4alpha-carbinolamine dehydratase activity, and binds HNF1alpha in vivo and in vitro. DCoH and DCoH2 adopt identical folds with structural differences confined largely to the protein surfaces and the tetramer interface. In contrast to the hyperstable DCoH tetramer, DCoH2 readily disproportionates and forms a 2:2 complex with HNF1 in vitro. Phylogenetic analysis reveals six major subfamilies of DCoH proteins, including unique DCoH and DCoH2 branches in metazoans. These results suggest distinct roles for DCoH and DCoH2. Differences in conserved surface residues could mediate binding to different effectors. We propose that HNF1alpha binding kinetics may distinguish regulation by DCoH2, under thermodynamic control, from regulation by DCoH, under kinetic control.


    Related Citations: 
    • Structural basis of dimerization, coactivator recognition and MODY3 mutations in HNF-1alpha
      Rose, R.B.,Bayle, J.H.,Endrizzi, J.A.,Cronk, J.D.,Crabtree, G.R.,Alber, T.
      (2000) Nat.Struct.Mol.Biol. 7: 744


    Organizational Affiliation

    Department of Molecular and Cell Biology, University of California, Berkeley, California 94720-3206, USA. bob_rose@ncsu.edu




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
DcoH-like protein DCoHm
A, B
105Mus musculusMutation(s): 0 
Gene Names: Pcbd2 (Dcoh2, Dcohm)
EC: 4.2.1.96
Find proteins for Q9CZL5 (Mus musculus)
Go to UniProtKB:  Q9CZL5
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.6 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.212 
  • Space Group: P 31 2 1
Unit Cell:
Length (Å)Angle (°)
a = 58.290α = 90.00
b = 58.290β = 90.00
c = 114.630γ = 120.00
Software Package:
Software NamePurpose
CNSphasing
CCP4data scaling
CNSrefinement
TRUNCATEdata reduction
MOSFLMdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-10-12
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance