Amidohydrolase, AHS with 3-HAA

Experimental Data Snapshot

  • Resolution: 1.25 Å
  • R-Value Free: 0.178 
  • R-Value Work: 0.165 
  • R-Value Observed: 0.165 

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This is version 1.3 of the entry. See complete history


The Biosynthesis of the Benzoxazole in Nataxazole Proceeds via an Unstable Ester and has Synthetic Utility.

Song, H.Rao, C.Deng, Z.Yu, Y.Naismith, J.H.

(2020) Angew Chem Int Ed Engl 59: 6054-6061

  • DOI: https://doi.org/10.1002/anie.201915685
  • Primary Citation of Related Structures:  
    6SIW, 6SIX, 6SIY, 6SIZ, 6SJ0, 6SJ1, 6SJ2, 6SJ3, 6SJ4, 6TM4

  • PubMed Abstract: 

    Heterocycles, a class of molecules that includes oxazoles, constitute one of the most common building blocks in current pharmaceuticals and are common in medicinally important natural products. The antitumor natural product nataxazole is a model for a large class of benzoxazole-containing molecules that are made by a pathway that is not characterized. We report structural, biochemical, and chemical evidence that benzoxazole biosynthesis proceeds through an ester generated by an ATP-dependent adenylating enzyme. The ester rearranges via a tetrahedral hemiorthoamide to yield an amide, which is a shunt product and not, as previously thought, an intermediate in the pathway. A second zinc-dependent enzyme catalyzes the formation of hemiorthoamide from the ester but, by shuttling protons, the enzyme eliminates water, a reverse hydrolysis reaction, to yield the benzoxazole and avoids the amide. These insights have allowed us to harness the pathway to synthesize a series of novel halogenated benzoxazoles.

  • Organizational Affiliation

    Key Laboratory of Combinatorial Biosynthesis and Drug Discovery (Ministry of Education), School of Pharmaceutical Sciences, Wuhan University, 185 East Lake Road, Wuhan, 430071, P. R. China.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
519Streptomyces sp. Tu 6176Mutation(s): 0 
Gene Names: natAMCF54_07360
Find proteins for A0A022MQ12 (Streptomyces sp. Tu 6176)
Explore A0A022MQ12 
Go to UniProtKB:  A0A022MQ12
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A022MQ12
Sequence Annotations
  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Resolution: 1.25 Å
  • R-Value Free: 0.178 
  • R-Value Work: 0.165 
  • R-Value Observed: 0.165 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 99.81α = 90
b = 118.89β = 90
c = 83.32γ = 90
Software Package:
Software NamePurpose
xia2data scaling
PDB_EXTRACTdata extraction
DIALSdata reduction

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2020-01-15
    Type: Initial release
  • Version 1.1: 2020-02-19
    Changes: Database references
  • Version 1.2: 2020-04-08
    Changes: Database references
  • Version 1.3: 2024-05-15
    Changes: Data collection, Database references, Derived calculations, Refinement description