Crystal structure of a type III polyketide synthase PKSIIINc from Neurospora crassa

Experimental Data Snapshot

  • Resolution: 2.58 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.213 
  • R-Value Observed: 0.216 

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This is version 1.3 of the entry. See complete history


Structural insights into biosynthesis of resorcinolic lipids by a type III polyketide synthase in Neurospora crassa

Goyal, A.Saxena, P.Rahman, A.Singh, P.K.Kasbekar, D.P.Gokhale, R.S.Sankaranarayanan, R.

(2008) J Struct Biol 162: 411-421

  • DOI: https://doi.org/10.1016/j.jsb.2008.02.009
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Microbial type III polyketide synthases (PKSs) have revealed remarkable mechanistic as well as functional versatility. Recently, a type III PKS homolog from Azotobacter has been implicated in the biosynthesis of resorcinolic lipids, thus adding a new functional significance to this class of proteins. Here, we report the structural and mutational investigations of a novel type III PKS protein from Neurospora crassa involved in the biosynthesis of resorcinolic metabolites by utilizing long chain fatty acyl-CoAs. The structure revealed a long hydrophobic tunnel responsible for its fatty acyl chain length specificity resembling that of PKS18, a mycobacterial type III PKS. Structure-based mutational studies to block the tunnel not only altered the fatty acyl chain specificity but also resulted in change of cyclization pattern affecting the product profile. This first structural characterization of a resorcinolic lipid synthase provides insights into the coordinated functioning of cyclization and a substrate-binding pocket, which shows mechanistic intricacy underlying type III PKS catalysis.

  • Organizational Affiliation

    Centre for Cellular and Molecular Biology, Uppal Road, Hyderabad 500 007, India.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Putative uncharacterized protein
A, B
465Neurospora crassaMutation(s): 0 
Find proteins for Q7S6N4 (Neurospora crassa (strain ATCC 24698 / 74-OR23-1A / CBS 708.71 / DSM 1257 / FGSC 987))
Explore Q7S6N4 
Go to UniProtKB:  Q7S6N4
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ7S6N4
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.58 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.213 
  • R-Value Observed: 0.216 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 70.023α = 90
b = 104.96β = 90
c = 105.68γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-08-26
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2017-10-25
    Changes: Refinement description
  • Version 1.3: 2023-11-01
    Changes: Data collection, Database references, Refinement description