5Z36

An anthrahydroquino-Gama-pyrone synthase Txn09 complexed with PDM


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the least restraint violations 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Enzymology of Anthraquinone-gamma-Pyrone Ring Formation in Complex Aromatic Polyketide Biosynthesis.

Hou, X.F.Song, Y.J.Zhang, M.Lan, W.X.Meng, S.Wang, C.X.Pan, H.X.Cao, C.Y.Tang, G.L.

(2018) Angew Chem Int Ed Engl 57: 13475-13479

  • DOI: https://doi.org/10.1002/anie.201806729
  • Primary Citation of Related Structures:  
    5Z36, 5Z4E, 5Z4F

  • PubMed Abstract: 

    Aromatic-fused γ-pyrones are structural features of many bioactive natural products and valid scaffolds for medicinal chemistry. However, the enzymology of their formation has not been completely established. Now it is demonstrated that TxnO9, a CalC-like protein belonging to a START family, functions as an unexpected anthraquinone-γ-pyrone synthase involved in the biosynthesis of antitumor antibiotic trioxacarcin A (TXN-A). Structural analysis by NMR identified a likely substrate/product-binding mode and putative key active sites of TxnO9, which allowed an enzymatic mechanism to be proposed. Moreover, a subset of uncharacterized homologous proteins bearing an unexamined Lys-Thr dyad exhibit the same function. Therefore, the functional assignment and mechanistic investigation of this γ-pyrone synthase elucidated an undescribed step in TXN-A biosynthesis, and the discovery of this new branch of polyketide heterocyclases expands the functions of the START superfamily.


  • Organizational Affiliation

    State Key Laboratory of Bioorganic and Natural Products Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai, 200032, China.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
TxnO9154Streptomyces bottropensisMutation(s): 0 
UniProt
Find proteins for A0A0K1H313 (Streptomyces bottropensis)
Explore A0A0K1H313 
Go to UniProtKB:  A0A0K1H313
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A0K1H313
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
969
Query on 969

Download Ideal Coordinates CCD File 
B [auth A]11-hydroxy-2-[(2S)-2-hydroxybutan-2-yl]-5-methyl-4H-anthra[1,2-b]pyran-4,7,12-trione
C22 H18 O6
SUGGWZIKECZBID-QFIPXVFZSA-N
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the least restraint violations 

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2018-12-12
    Type: Initial release
  • Version 1.1: 2023-06-14
    Changes: Data collection, Database references, Other
  • Version 1.2: 2024-05-15
    Changes: Data collection, Database references