6E87

Crystal structure of ferrous form of the crosslinked human cysteine dioxygenase in the anaerobic condition

  • Classification: OXIDOREDUCTASE
  • Organism(s): Homo sapiens
  • Expression System: Escherichia coli
  • Mutation(s): No 

  • Deposited: 2018-07-27 Released: 2019-04-17 
  • Deposition Author(s): Liu, A., Li, J.
  • Funding Organization(s): National Science Foundation (NSF, United States), National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.197 
  • R-Value Work: 0.171 
  • R-Value Observed: 0.173 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Probing the Cys-Tyr Cofactor Biogenesis in Cysteine Dioxygenase by the Genetic Incorporation of Fluorotyrosine.

Li, J.Koto, T.Davis, I.Liu, A.

(2019) Biochemistry 58: 2218-2227

  • DOI: 10.1021/acs.biochem.9b00006
  • Primary Citation of Related Structures:  
    6BPR, 6E87, 6N42, 6N43

  • PubMed Abstract: 
  • Cysteine dioxygenase (CDO) is a nonheme iron enzyme that adds two oxygen atoms from dioxygen to the sulfur atom of l-cysteine. Adjacent to the iron site of mammalian CDO, there is a post-translationally generated Cys-Tyr cofactor, whose presence substantially enhances the oxygenase activity ...

    Cysteine dioxygenase (CDO) is a nonheme iron enzyme that adds two oxygen atoms from dioxygen to the sulfur atom of l-cysteine. Adjacent to the iron site of mammalian CDO, there is a post-translationally generated Cys-Tyr cofactor, whose presence substantially enhances the oxygenase activity. The formation of the Cys-Tyr cofactor in CDO is an autocatalytic process, and it is challenging to study by traditional techniques because the cross-linking reaction is a side, uncoupled, single-turnover oxidation buried among multiple turnovers of l-cysteine oxygenation. Here, we take advantage of our recent success in obtaining a purely uncross-linked human CDO due to site-specific incorporation of 3,5-difluoro-l-tyrosine (F 2 -Tyr) at the cross-linking site through the genetic code expansion strategy. Using EPR spectroscopy, we show that nitric oxide ( NO), an oxygen surrogate, similarly binds to uncross-linked F 2 -Tyr157 CDO as in wild-type human CDO. We determined X-ray crystal structures of uncross-linked F 2 -Tyr157 CDO and mature wild-type CDO in complex with both l-cysteine and NO. These structural data reveal that the active site cysteine (Cys93 in the human enzyme), rather than the generally expected tyrosine (i.e., Tyr157), is well-aligned to be oxidized should the normal oxidation reaction uncouple. This structure-based understanding is further supported by a computational study with models built on the uncross-linked ternary complex structure. Together, these results strongly suggest that the first target to oxidize during the iron-assisted Cys-Tyr cofactor biogenesis is Cys93. Based on these data, a plausible reaction mechanism implementing a cysteine radical involved in the cross-link formation is proposed.


    Organizational Affiliation

    Department of Chemistry , University of Texas at San Antonio , San Antonio , Texas 78249 , United States.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Cysteine dioxygenase type 1A200Homo sapiensMutation(s): 0 
Gene Names: CDO1
EC: 1.13.11.20
UniProt & NIH Common Fund Data Resources
Find proteins for Q16878 (Homo sapiens)
Explore Q16878 
Go to UniProtKB:  Q16878
PHAROS:  Q16878
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ16878
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.197 
  • R-Value Work: 0.171 
  • R-Value Observed: 0.173 
  • Space Group: P 65
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 131.706α = 90
b = 131.706β = 90
c = 34.325γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
PHENIXrefinement
PDB_EXTRACTdata extraction
PHASERphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data

  • Released Date: 2019-04-17 
  • Deposition Author(s): Liu, A., Li, J.

Funding OrganizationLocationGrant Number
National Science Foundation (NSF, United States)United StatesCHE-1623856
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR01GM107529
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR01GM108988

Revision History  (Full details and data files)

  • Version 1.0: 2019-04-17
    Type: Initial release
  • Version 1.1: 2019-05-01
    Changes: Data collection, Database references
  • Version 1.2: 2019-05-15
    Changes: Data collection, Database references
  • Version 1.3: 2019-11-27
    Changes: Author supporting evidence