7RK0

Crystal structure of Thermovibrio ammonificans THI4


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.28 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.218 
  • R-Value Observed: 0.221 

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Ligand Structure Quality Assessment 


This is version 1.2 of the entry. See complete history


Literature

Structure and function of aerotolerant, multiple-turnover THI4 thiazole synthases.

Joshi, J.Li, Q.Garcia-Garcia, J.D.Leong, B.J.Hu, Y.Bruner, S.D.Hanson, A.D.

(2021) Biochem J 478: 3265-3279

  • DOI: https://doi.org/10.1042/BCJ20210565
  • Primary Citation of Related Structures:  
    7RK0

  • PubMed Abstract: 

    Plant and fungal THI4 thiazole synthases produce the thiamin thiazole moiety in aerobic conditions via a single-turnover suicide reaction that uses an active-site Cys residue as sulfur donor. Multiple-turnover (i.e. catalytic) THI4s lacking an active-site Cys (non-Cys THI4s) that use sulfide as sulfur donor have been biochemically characterized -- but only from archaeal methanogens that are anaerobic, O2-sensitive hyperthermophiles from sulfide-rich habitats. These THI4s prefer iron as cofactor. A survey of prokaryote genomes uncovered non-Cys THI4s in aerobic mesophiles from sulfide-poor habitats, suggesting that multiple-turnover THI4 operation is possible in aerobic, mild, low-sulfide conditions. This was confirmed by testing 23 representative non-Cys THI4s for complementation of an Escherichia coli ΔthiG thiazole auxotroph in aerobic conditions. Sixteen were clearly active, and more so when intracellular sulfide level was raised by supplying Cys, demonstrating catalytic function in the presence of O2 at mild temperatures and indicating use of sulfide or a sulfide metabolite as sulfur donor. Comparative genomic evidence linked non-Cys THI4s with proteins from families that bind, transport, or metabolize cobalt or other heavy metals. The crystal structure of the aerotolerant bacterial Thermovibrio ammonificans THI4 was determined to probe the molecular basis of aerotolerance. The structure suggested no large deviations compared with the structures of THI4s from O2-sensitive methanogens, but is consistent with an alternative catalytic metal. Together with complementation data, use of cobalt rather than iron was supported. We conclude that catalytic THI4s can indeed operate aerobically and that the metal cofactor inserted is a likely natural determinant of aerotolerance.


  • Organizational Affiliation

    Department of Horticultural Sciences, University of Florida, Gainesville, FL, U.S.A.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Thiamine thiazole synthase
A, B, C, D
268Thermovibrio ammonificansMutation(s): 0 
Gene Names: thi4Theam_0077
EC: 2.4.2.59
UniProt
Find proteins for E8T346 (Thermovibrio ammonificans (strain DSM 15698 / JCM 12110 / HB-1))
Explore E8T346 
Go to UniProtKB:  E8T346
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupE8T346
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
48H (Subject of Investigation/LOI)
Query on 48H

Download Ideal Coordinates CCD File 
F [auth A],
H [auth B],
J [auth C],
L [auth D]
2-[(E)-[(4R)-5-[[[(2R,3S,4R,5R)-5-(6-aminopurin-9-yl)-3,4-bis(oxidanyl)oxolan-2-yl]methoxy-oxidanyl-phosphoryl]oxy-oxidanyl-phosphoryl]oxy-4-oxidanyl-3-oxidanylidene-pentan-2-ylidene]amino]ethanoic acid
C17 H24 N6 O14 P2
IOANXAZHBCZCOH-NTPWJJDISA-N
FE
Query on FE

Download Ideal Coordinates CCD File 
E [auth A],
G [auth B],
I [auth C],
K [auth D]
FE (III) ION
Fe
VTLYFUHAOXGGBS-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.28 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.218 
  • R-Value Observed: 0.221 
  • Space Group: I 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 89.889α = 90
b = 89.685β = 96.979
c = 131.813γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XDSdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Department of Energy (DOE, United States)United StatesDE-SC0020153

Revision History  (Full details and data files)

  • Version 1.0: 2021-09-01
    Type: Initial release
  • Version 1.1: 2021-09-15
    Changes: Database references
  • Version 1.2: 2023-10-18
    Changes: Data collection, Refinement description