Streptomcyes albus JA3453 oxazolomycin ketosynthase domain OzmQ KS1

Experimental Data Snapshot

  • Resolution: 1.90 Å
  • R-Value Free: 0.179 
  • R-Value Work: 0.150 
  • R-Value Observed: 0.152 

wwPDB Validation   3D Report Full Report

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Structural and evolutionary relationships of "AT-less" type I polyketide synthase ketosynthases.

Lohman, J.R.Ma, M.Osipiuk, J.Nocek, B.Kim, Y.Chang, C.Cuff, M.Mack, J.Bigelow, L.Li, H.Endres, M.Babnigg, G.Joachimiak, A.Phillips, G.N.Shen, B.

(2015) Proc Natl Acad Sci U S A 112: 12693-12698

  • DOI: https://doi.org/10.1073/pnas.1515460112
  • Primary Citation of Related Structures:  
    4OPE, 4OPF, 4OQJ, 4QYR, 4TKT, 4WKY, 4ZDN

  • PubMed Abstract: 

    Acyltransferase (AT)-less type I polyketide synthases (PKSs) break the type I PKS paradigm. They lack the integrated AT domains within their modules and instead use a discrete AT that acts in trans, whereas a type I PKS module minimally contains AT, acyl carrier protein (ACP), and ketosynthase (KS) domains. Structures of canonical type I PKS KS-AT didomains reveal structured linkers that connect the two domains. AT-less type I PKS KSs have remnants of these linkers, which have been hypothesized to be AT docking domains. Natural products produced by AT-less type I PKSs are very complex because of an increased representation of unique modifying domains. AT-less type I PKS KSs possess substrate specificity and fall into phylogenetic clades that correlate with their substrates, whereas canonical type I PKS KSs are monophyletic. We have solved crystal structures of seven AT-less type I PKS KS domains that represent various sequence clusters, revealing insight into the large structural and subtle amino acid residue differences that lead to unique active site topologies and substrate specificities. One set of structures represents a larger group of KS domains from both canonical and AT-less type I PKSs that accept amino acid-containing substrates. One structure has a partial AT-domain, revealing the structural consequences of a type I PKS KS evolving into an AT-less type I PKS KS. These structures highlight the structural diversity within the AT-less type I PKS KS family, and most important, provide a unique opportunity to study the molecular evolution of substrate specificity within the type I PKSs.

  • Organizational Affiliation

    Department of Chemistry, The Scripps Research Institute, Jupiter, FL 33458;

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
PKS845Streptomyces albusMutation(s): 0 
Gene Names: ozmQ
Find proteins for B2WW50 (Streptomyces albus)
Explore B2WW50 
Go to UniProtKB:  B2WW50
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupB2WW50
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on MSE
Experimental Data & Validation

Experimental Data

  • Resolution: 1.90 Å
  • R-Value Free: 0.179 
  • R-Value Work: 0.150 
  • R-Value Observed: 0.152 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 93.512α = 90
b = 129.455β = 98.64
c = 85.088γ = 90
Software Package:
Software NamePurpose
SBC-Collectdata collection
DMmodel building
ARP/wARPmodel building
CCP4model building
HKL-3000data reduction
HKL-3000data scaling

Structure Validation

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Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2014-03-19
    Type: Initial release
  • Version 1.1: 2014-03-26
    Changes: Structure summary
  • Version 1.2: 2016-11-02
    Changes: Database references, Derived calculations, Structure summary