5INI

Structural basis for acyl-CoA carboxylase-mediated assembly of unusual polyketide synthase extender units incorporated into the stambomycin antibiotics


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.85 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.173 
  • R-Value Observed: 0.175 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.5 of the entry. See complete history


Literature

A crotonyl-CoA reductase-carboxylase independent pathway for assembly of unusual alkylmalonyl-CoA polyketide synthase extender units.

Ray, L.Valentic, T.R.Miyazawa, T.Withall, D.M.Song, L.Milligan, J.C.Osada, H.Takahashi, S.Tsai, S.C.Challis, G.L.

(2016) Nat Commun 7: 13609-13609

  • DOI: https://doi.org/10.1038/ncomms13609
  • Primary Citation of Related Structures:  
    5INF, 5ING, 5INI

  • PubMed Abstract: 

    Type I modular polyketide synthases assemble diverse bioactive natural products. Such multienzymes typically use malonyl and methylmalonyl-CoA building blocks for polyketide chain assembly. However, in several cases more exotic alkylmalonyl-CoA extender units are also known to be incorporated. In all examples studied to date, such unusual extender units are biosynthesized via reductive carboxylation of α, β-unsaturated thioesters catalysed by crotonyl-CoA reductase/carboxylase (CCRC) homologues. Here we show using a chemically-synthesized deuterium-labelled mechanistic probe, and heterologous gene expression experiments that the unusual alkylmalonyl-CoA extender units incorporated into the stambomycin family of polyketide antibiotics are assembled by direct carboxylation of medium chain acyl-CoA thioesters. X-ray crystal structures of the unusual β-subunit of the acyl-CoA carboxylase (YCC) responsible for this reaction, alone and in complex with hexanoyl-CoA, reveal the molecular basis for substrate recognition, inspiring the development of methodology for polyketide bio-orthogonal tagging via incorporation of 6-azidohexanoic acid and 8-nonynoic acid into novel stambomycin analogues.


  • Organizational Affiliation

    Department of Chemistry, University of Warwick, Coventry CV4 7AL, UK.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Putative carboxyl transferase
A, B, C, D, E
A, B, C, D, E, F
538Streptomyces ambofaciens ATCC 23877Mutation(s): 0 
Gene Names: SAM23877_7108SAMR0483
UniProt
Find proteins for A0ACI9 (Streptomyces ambofaciens (strain ATCC 23877 / 3486 / DSM 40053 / JCM 4204 / NBRC 12836 / NRRL B-2516))
Explore A0ACI9 
Go to UniProtKB:  A0ACI9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0ACI9
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.85 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.173 
  • R-Value Observed: 0.175 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 110.978α = 90
b = 161.526β = 90
c = 187.294γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
MOSFLMdata reduction
Aimlessdata scaling
PHASERphasing
Cootmodel building

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 Kingdomdoctoral training grant
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR01 GM100305
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR01 GM076330

Revision History  (Full details and data files)

  • Version 1.0: 2016-12-28
    Type: Initial release
  • Version 1.1: 2017-01-04
    Changes: Database references
  • Version 1.2: 2017-09-13
    Changes: Author supporting evidence
  • Version 1.3: 2019-12-25
    Changes: Author supporting evidence
  • Version 1.4: 2020-01-01
    Changes: Author supporting evidence
  • Version 1.5: 2023-09-27
    Changes: Data collection, Database references, Refinement description