Ketosynthase from module 5 of the bacillaene synthase from Bacillus amyloliquefaciens FZB42

Experimental Data Snapshot

  • Resolution: 4.20 Å
  • R-Value Free: 0.341 
  • R-Value Work: 0.288 
  • R-Value Observed: 0.291 

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The LINKS motif zippers trans-acyltransferase polyketide synthase assembly lines into a biosynthetic megacomplex.

Gay, D.C.Wagner, D.T.Meinke, J.L.Zogzas, C.E.Gay, G.R.Keatinge-Clay, A.T.

(2016) J Struct Biol 193: 196-205

  • DOI: https://doi.org/10.1016/j.jsb.2015.12.011
  • Primary Citation of Related Structures:  
    5E5N, 5E6K, 5ELP, 5ENY, 5ERB, 5ERF

  • PubMed Abstract: 

    Polyketides such as the clinically-valuable antibacterial agent mupirocin are constructed by architecturally-sophisticated assembly lines known as trans-acyltransferase polyketide synthases. Organelle-sized megacomplexes composed of several copies of trans-acyltransferase polyketide synthase assembly lines have been observed by others through transmission electron microscopy to be located at the Bacillus subtilis plasma membrane, where the synthesis and export of the antibacterial polyketide bacillaene takes place. In this work we analyze ten crystal structures of trans-acyltransferase polyketide synthases ketosynthase domains, seven of which are reported here for the first time, to characterize a motif capable of zippering assembly lines into a megacomplex. While each of the three-helix LINKS (Laterally-INteracting Ketosynthase Sequence) motifs is observed to similarly dock with a spatially-reversed copy of itself through hydrophobic and ionic interactions, the amino acid sequences of this motif are not conserved. Such a code is appropriate for mediating homotypic contacts between assembly lines to ensure the ordered self-assembly of a noncovalent, yet tightly-knit, enzymatic network. LINKS-mediated lateral interactions would also have the effect of bolstering the vertical association of the polypeptides that comprise a polyketide synthase assembly line.

  • Organizational Affiliation

    Department of Molecular Biosciences, The University of Texas at Austin, 1 University Station A5000, Austin, TX 78712-0165, United States; Department of Chemistry, The University of Texas at Austin, 1 University Station A5300, Austin, TX 78712-0165, United States. Electronic address: adriankc@utexas.edu.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Polyketide synthase
A, B, C, D
640Bacillus amyloliquefaciensMutation(s): 0 
Gene Names: baeL
Find proteins for Q1RS72 (Bacillus amyloliquefaciens)
Explore Q1RS72 
Go to UniProtKB:  Q1RS72
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ1RS72
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 4.20 Å
  • R-Value Free: 0.341 
  • R-Value Work: 0.288 
  • R-Value Observed: 0.291 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 70.758α = 90
b = 319.132β = 110.26
c = 103.47γ = 90
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-12-23
    Type: Initial release
  • Version 1.1: 2016-11-02
    Changes: Database references
  • Version 1.2: 2017-09-27
    Changes: Data collection, Database references, Derived calculations