6FIK

ACP2 crosslinked to the KS of the loading/condensing region of the CTB1 PKS


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 7.10 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

The structural organization of substrate loading in iterative polyketide synthases.

Herbst, D.A.Huitt-Roehl, C.R.Jakob, R.P.Kravetz, J.M.Storm, P.A.Alley, J.R.Townsend, C.A.Maier, T.

(2018) Nat Chem Biol 14: 474-479

  • DOI: https://doi.org/10.1038/s41589-018-0026-3
  • Primary Citation of Related Structures:  
    6FIJ, 6FIK

  • PubMed Abstract: 

    Polyketide synthases (PKSs) are microbial multienzymes for the biosynthesis of biologically potent secondary metabolites. Polyketide production is initiated by the loading of a starter unit onto an integral acyl carrier protein (ACP) and its subsequent transfer to the ketosynthase (KS). Initial substrate loading is achieved either by multidomain loading modules or by the integration of designated loading domains, such as starter unit acyltransferases (SAT), whose structural integration into PKS remains unresolved. A crystal structure of the loading/condensing region of the nonreducing PKS CTB1 demonstrates the ordered insertion of a pseudodimeric SAT into the condensing region, which is aided by the SAT-KS linker. Cryo-electron microscopy of the post-loading state trapped by mechanism-based crosslinking of ACP to KS reveals asymmetry across the CTB1 loading/-condensing region, in accord with preferential 1:2 binding stoichiometry. These results are critical for re-engineering the loading step in polyketide biosynthesis and support functional relevance of asymmetric conformations of PKSs.


  • Organizational Affiliation

    Department of Biozentrum, University of Basel, Basel, Switzerland.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Polyketide synthase
A, B
1,304Cercospora nicotianaeMutation(s): 3 
UniProt
Find proteins for Q6DQW3 (Cercospora nicotianae)
Explore Q6DQW3 
Go to UniProtKB:  Q6DQW3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ6DQW3
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Polyketide synthase88Cercospora nicotianaeMutation(s): 0 
UniProt
Find proteins for Q6DQW3 (Cercospora nicotianae)
Explore Q6DQW3 
Go to UniProtKB:  Q6DQW3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ6DQW3
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 7.10 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONRELION2

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Swiss National Science FoundationSwitzerland159696
Swiss National Science FoundationSwitzerland145023
Swiss National Science FoundationSwitzerland164074
Swiss National Science FoundationSwitzerland138262
National Institutes of HealthUnited StatesES001670

Revision History  (Full details and data files)

  • Version 1.0: 2018-03-21
    Type: Initial release
  • Version 1.1: 2018-04-04
    Changes: Data collection, Database references
  • Version 1.2: 2018-04-11
    Changes: Data collection, Database references
  • Version 1.3: 2018-04-25
    Changes: Data collection, Database references
  • Version 1.4: 2019-12-11
    Changes: Other