Crystal structure of Alpha/beta hydrolase GrgF from Penicillium sp. sh18

Experimental Data Snapshot

  • Resolution: 1.90 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.180 

Starting Model: experimental
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Molecular Basis for the Biosynthesis of an Unusual Chain-Fused Polyketide, Gregatin A.

Wang, W.G.Wang, H.Du, L.Q.Li, M.Chen, L.Yu, J.Cheng, G.G.Zhan, M.T.Hu, Q.F.Zhang, L.Yao, M.Matsuda, Y.

(2020) J Am Chem Soc 142: 8464-8472

  • DOI: https://doi.org/10.1021/jacs.0c02337
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Gregatin A ( 1 ) is a fungal polyketide featuring an alkylated furanone core, but the biosynthetic mechanism to furnish the intriguing molecular skeleton has yet to be elucidated. Herein, we have identified the biosynthetic gene cluster of gregatin A ( 1 ) in Penicillium sp. sh18 and investigated the mechanism that produces the intriguing structure of 1 by in vivo and in vitro reconstitution of its biosynthesis. Our study established the biosynthetic route leading to 1 and illuminated that 1 is generated by the fusion of two different polyketide chains, which are, amazingly, synthesized by a single polyketide synthase GrgA with the aid of a trans -acting enoylreductase GrgB. Chain fusion, as well as chain hydrolysis, is catalyzed by an α/β hydrolase, GrgF, hybridizing the C 11 and C 4 carbon chains by Claisen condensation. Finally, structural analysis and mutational experiments using GrgF provided insight into how the enzyme facilitates the unusual chain-fusing reaction. In unraveling a new biosynthetic strategy involving a bifunctional PKS and a polyketide fusing enzyme, our study expands our knowledge concerning fungal polyketide biosynthesis.

  • Organizational Affiliation

    Key Laboratory of Chemistry in Ethnic Medicinal Resources, State Ethnic Affairs Commission and Ministry of Education, Yunnan Minzu University, Kunming 650031, Yunnan, China.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
294Penicillium sp. sh18Mutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.90 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.180 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 42.683α = 101.708
b = 55.01β = 100.514
c = 67.272γ = 114.279
Software Package:
Software NamePurpose
PHENIXmodel building
XDSdata reduction
XDSdata scaling

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Natural Science Foundation of China (NSFC)China31960095
National Natural Science Foundation of China (NSFC)China31960096

Revision History  (Full details and data files)

  • Version 1.0: 2020-06-24
    Type: Initial release
  • Version 1.1: 2023-11-29
    Changes: Data collection, Database references, Derived calculations, Refinement description