Streptomcyes albus JA3453 oxazolomycin ketosynthase domain OzmH KS8

Experimental Data Snapshot

  • Resolution: 2.12 Å
  • R-Value Free: 0.179 
  • R-Value Work: 0.156 
  • R-Value Observed: 0.157 

wwPDB Validation   3D Report Full Report

This is version 1.4 of the entry. See complete history


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; Department of Molecular Therapeutics, The Scripps Research Institute, Jupiter, FL 33458; Natural Products Library Initiative at The Scripps Research Institute, The Scripps Research Institute, Jupiter, FL 33458 shenb@scripps.edu.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
NRPS/PKS438Streptomyces albusMutation(s): 0 
Gene Names: ozmH
Find proteins for B2WW42 (Streptomyces albus)
Explore B2WW42 
Go to UniProtKB:  B2WW42
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupB2WW42
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on MSE
Experimental Data & Validation

Experimental Data

Unit Cell:
Length ( Å )Angle ( ˚ )
a = 145.922α = 90
b = 145.922β = 90
c = 145.922γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
PDB_EXTRACTdata extraction
SBC-Collectdata collection
HKL-3000data reduction
HKL-3000data scaling

Structure Validation

View Full Validation Report

Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2014-02-19
    Type: Initial release
  • Version 1.1: 2014-03-05
    Changes: Database references, Structure summary
  • Version 1.2: 2014-04-02
    Changes: Structure summary
  • Version 1.3: 2016-11-02
    Changes: Database references, Structure summary
  • Version 1.4: 2017-11-22
    Changes: Refinement description