An Irreversible, Promiscuous and Highly Thermostable Claisen-Condensation Biocatalyst Drives the Synthesis of Substituted Pyrroles

Experimental Data Snapshot

  • Resolution: 1.60 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.169 

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This is version 1.2 of the entry. See complete history


Versatile Chemo-Biocatalytic Cascade Driven by a Thermophilic and Irreversible C-C Bond-Forming alpha-Oxoamine Synthase.

Ashley, B.Basle, A.Sajjad, M.El Ashram, A.Kelis, P.Marles-Wright, J.Campopiano, D.J.

(2023) ACS Sustain Chem Eng 11: 7997-8002

  • DOI: https://doi.org/10.1021/acssuschemeng.3c00243
  • Primary Citation of Related Structures:  
    7POA, 7POB, 7POC

  • PubMed Abstract: 

    We report a chemo-biocatalytic cascade for the synthesis of substituted pyrroles, driven by the action of an irreversible, thermostable, pyridoxal 5'-phosphate (PLP)-dependent, C-C bond-forming biocatalyst ( Th AOS). The Th AOS catalyzes the Claisen-like condensation between various amino acids and acyl-CoA substrates to generate a range of α-aminoketones. These products are reacted with β-keto esters in an irreversible Knorr pyrrole reaction. The determination of the 1.6 Å resolution crystal structure of the PLP-bound form of Th AOS lays the foundation for future engineering and directed evolution. This report establishes the AOS family as useful and versatile C-C bond-forming biocatalysts.

  • Organizational Affiliation

    School of Chemistry, University of Edinburgh, Joseph Black Building, David Brewster Road, Edinburgh EH9 3FJ, United Kingdom.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
8-amino-7-oxononanoate synthase/2-amino-3-ketobutyrate coenzyme A ligase
A, B
421Thermus thermophilusMutation(s): 0 
Gene Names: TTHA1582
EC: (PDB Primary Data), (PDB Primary Data)
Find proteins for Q5SHZ8 (Thermus thermophilus (strain ATCC 27634 / DSM 579 / HB8))
Explore Q5SHZ8 
Go to UniProtKB:  Q5SHZ8
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ5SHZ8
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.60 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.169 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 57.41α = 64.74
b = 63.89β = 70.5
c = 65.91γ = 68.12
Software Package:
Software NamePurpose
Aimlessdata scaling
pointlessdata scaling
Cootmodel building
BUCCANEERmodel building
MolProbitymodel building
xia2data scaling
XDSdata reduction

Structure Validation

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Ligand Structure Quality Assessment 

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Biotechnology and Biological Sciences Research Council (BBSRC)United KingdomBB/J01446X/1

Revision History  (Full details and data files)

  • Version 1.0: 2022-09-21
    Type: Initial release
  • Version 1.1: 2024-01-31
    Changes: Data collection, Refinement description
  • Version 1.2: 2024-02-28
    Changes: Database references