3E1H

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.58 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.213 
  • R-Value Observed: 0.216 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

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: 10.1016/j.jsb.2008.02.009
  • Primary Citation of Related Structures:  
    3E1H

  • 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 ...

    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.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Putative uncharacterized proteinA, B465Neurospora crassaMutation(s): 0 
EC: 2.3.1.74
UniProt
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
Protein Feature View
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • 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
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling
MOLREPphasing

Structure Validation

View Full Validation Report




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