4XF9

cysteine dioxygenase variant - C93A at pH 8.0 in complex with homocysteine

  • Classification: OXIDOREDUCTASE
  • Organism(s): Rattus norvegicus
  • Expression System: Escherichia coli
  • Mutation(s): 

  • Deposited: 2014-12-26 Released: 2016-02-24 
  • Deposition Author(s): Driggers, C.M., Karplus, P.A.
  • Funding Organization(s): National Institutes of Health/National Institute of Diabetes and Digestive and Kidney Disease; Department of Energy (United States) 

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.3 Å
  • R-Value Free: 0.186 
  • R-Value Work: 0.157 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure-Based Insights into the Role of the Cys-Tyr Crosslink and Inhibitor Recognition by Mammalian Cysteine Dioxygenase.

Driggers, C.M.Kean, K.M.Hirschberger, L.L.Cooley, R.B.Stipanuk, M.H.Karplus, P.A.

(2016) J. Mol. Biol. 428: 3999-4012

  • DOI: 10.1016/j.jmb.2016.07.012
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • In mammals, the non-heme iron enzyme cysteine dioxygenase (CDO) helps regulate Cys levels through converting Cys to Cys sulfinic acid. Its activity is in part modulated by the formation of a Cys93-Tyr157 crosslink that increases its catalytic efficie ...

    In mammals, the non-heme iron enzyme cysteine dioxygenase (CDO) helps regulate Cys levels through converting Cys to Cys sulfinic acid. Its activity is in part modulated by the formation of a Cys93-Tyr157 crosslink that increases its catalytic efficiency over 10-fold. Here, 21 high-resolution mammalian CDO structures are used to gain insight into how the Cys-Tyr crosslink promotes activity and how select competitive inhibitors bind. Crystal structures of crosslink-deficient C93A and Y157F variants reveal similar ~1.0-Å shifts in the side chain of residue 157, and both variant structures have a new chloride ion coordinating the active site iron. Cys binding is also different from wild-type CDO, and no Cys-persulfenate forms in the C93A or Y157F active sites at pH6.2 or 8.0. We conclude that the crosslink enhances activity by positioning the Tyr157 hydroxyl to enable proper Cys binding, proper oxygen binding, and optimal chemistry. In addition, structures are presented for homocysteine (Hcy), D-Cys, thiosulfate, and azide bound as competitive inhibitors. The observed binding modes of Hcy and D-Cys clarify why they are not substrates, and the binding of azide shows that in contrast to what has been proposed, it does not bind in these crystals as a superoxide mimic.


    Organizational Affiliation

    Department of Biochemistry and Biophysics, 2011 Ag & Life Sciences Building, Oregon State University, Corvallis, OR 97331, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Cysteine dioxygenase type 1
A
200Rattus norvegicusMutation(s): 1 
Gene Names: Cdo1
EC: 1.13.11.20
Find proteins for P21816 (Rattus norvegicus)
Go to UniProtKB:  P21816
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HCS
Query on HCS

Download SDF File 
Download CCD File 
A
2-AMINO-4-MERCAPTO-BUTYRIC ACID
C4 H9 N O2 S
FFFHZYDWPBMWHY-VKHMYHEASA-N
 Ligand Interaction
FE
Query on FE

Download SDF File 
Download CCD File 
A
FE (III) ION
Fe
VTLYFUHAOXGGBS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.3 Å
  • R-Value Free: 0.186 
  • R-Value Work: 0.157 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 57.600α = 90.00
b = 57.600β = 90.00
c = 122.400γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement
iMOSFLMdata reduction
Aimlessdata scaling
PHENIXphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of Diabetes and Digestive and Kidney DiseaseUnited StatesNIH-DK-056649
Department of Energy (United States)United StatesDE-AC02-98CH10886

Revision History 

  • Version 1.0: 2016-02-24
    Type: Initial release
  • Version 1.1: 2016-12-14
    Type: Database references
  • Version 1.2: 2017-09-20
    Type: Author supporting evidence