3EUT | pdb_00003eut

X-ray crystal structure of a type III pentaketide synthase from Neurospora crassa

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 
    0.225 (Depositor), 0.228 (DCC) 
  • R-Value Work: 
    0.174 (Depositor), 0.176 (DCC) 
  • R-Value Observed: 
    0.176 (Depositor) 

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This is version 1.3 of the entry. See complete history. 

Literature

Distinct Structural Elements Dictate the Specificity of the Type III Pentaketide Synthase from Neurospora crassa.

Rubin-Pitel, S.B., Zhang, H., Vu, T., Brunzelle, J.S., Zhao, H., Nair, S.K.

(2008) Chem Biol 15: 1079-1090

  • DOI: https://doi.org/10.1016/j.chembiol.2008.08.011
  • Primary Citation Related Structures: 
    3EUO, 3EUQ, 3EUT

  • PubMed Abstract: 

    The fungal type III polyketide synthase 2'-oxoalkylresorcylic acid synthase (ORAS) primes with a range of acyl-Coenzyme A thioesters (C4-C20) and extends using malonyl-Coenzyme A to produce pyrones, resorcinols, and resorcylic acids. To gain insight into this unusual substrate specificity and product profile, we have determined the crystal structures of ORAS to 1.75 A resolution, the Phe-252-->Gly site-directed mutant to 2.1 A resolution, and a binary complex of ORAS with eicosanoic acid to 2.0 A resolution. The structures reveal a distinct rearrangement of structural elements near the active site that allows accommodation of long-chain fatty acid esters and a reorientation of the gating mechanism that controls cyclization and polyketide chain length. The roles of these structural elements are further elucidated by characterization of various structure-based site-directed variants. These studies establish an unexpected plasticity to the PKS fold, unanticipated from structural studies of other members of this enzyme family.

    • Organizational Affiliation: 
    • Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, 600 S. Mathews Avenue, Urbana, IL 61801, USA.

Macromolecule Content 

  • Total Structure Weight: 163.82 kDa 
  • Atom Count: 12,277 
  • Modeled Residue Count: 1,516 
  • Deposited Residue Count: 1,516 
  • Unique protein chains: 1

Macromolecules

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|  3D Structure
Entity ID: 1
MoleculeChains  Sequence LengthOrganismDetailsImage
Putative uncharacterized protein
A, B, C, D
379Neurospora crassaMutation(s): 0 
Gene Names: NCU04801, NCU04801.1
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
Sequence Annotations
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Reference Sequence

Small Molecules

Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
CSD
Query on CSD
A, B, C, D
L-PEPTIDE LINKINGC3 H7 N O4 SCYS

Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free:  0.225 (Depositor), 0.228 (DCC) 
  • R-Value Work:  0.174 (Depositor), 0.176 (DCC) 
  • R-Value Observed: 0.176 (Depositor) 
Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 68.867α = 90
b = 105.925β = 90.1
c = 104.124γ = 90
Software Package:
Software NamePurpose
REFMACrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-11-11
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2023-12-27
    Changes: Data collection, Database references, Derived calculations
  • Version 1.3: 2024-11-20
    Changes: Structure summary