Crystal structure of PsoF with SAH

Experimental Data Snapshot

  • Resolution: 1.99 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.172 
  • R-Value Observed: 0.174 

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This is version 1.2 of the entry. See complete history


Functional and Structural Analyses oftrans C-Methyltransferase in Fungal Polyketide Biosynthesis.

Kishimoto, S.Tsunematsu, Y.Matsushita, T.Hara, K.Hashimoto, H.Tang, Y.Watanabe, K.

(2019) Biochemistry 58: 3933-3937

  • DOI: https://doi.org/10.1021/acs.biochem.9b00702
  • Primary Citation of Related Structures:  
    6KJG, 6KJI

  • PubMed Abstract: 

    Biosynthesis of certain fungal polyketide-peptide synthetases involves C -methyltransferase activity that adds one or more S -adenosyl-l-methionine-derived methyl groups to the carbon framework. The previously reported PsoF-MT, the stand-alone C -methyltransferase (MT) from the pseurotin biosynthetic pathway that exists as a domain within a trifunctional didomain enzyme PsoF, was characterized crystallographically and kinetically using mutants with substrate analogs to understand how a trans -acting C -MT works and compare it to known polyketide synthase-associated C -MTs. This study identified key active-site residues involved in catalysis and substrate recognition, which led us to propose the mechanism of C -methylation and substrate specificity determinants in PsoF-MT.

  • Organizational Affiliation

    Department of Pharmaceutical Sciences , University of Shizuoka , Shizuoka 422-8526 , Japan.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Dual-functional monooxygenase/methyltransferase psoF
A, B, C
378Aspergillus fumigatus Af293Mutation(s): 0 
Gene Names: psoFAFUA_8G00440
EC: 1 (PDB Primary Data), 2.1.1 (PDB Primary Data)
Find proteins for Q4WAZ0 (Aspergillus fumigatus (strain ATCC MYA-4609 / CBS 101355 / FGSC A1100 / Af293))
Explore Q4WAZ0 
Go to UniProtKB:  Q4WAZ0
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ4WAZ0
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
SAH (Subject of Investigation/LOI)
Query on SAH

Download Ideal Coordinates CCD File 
D [auth A],
G [auth B],
J [auth C]
C14 H20 N6 O5 S
Query on SO4

Download Ideal Coordinates CCD File 
E [auth A]
F [auth A]
H [auth B]
I [auth B]
K [auth C]
E [auth A],
F [auth A],
H [auth B],
I [auth B],
K [auth C],
L [auth C]
O4 S
Experimental Data & Validation

Experimental Data

  • Resolution: 1.99 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.172 
  • R-Value Observed: 0.174 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 190.873α = 90
b = 44.036β = 93.24
c = 143.124γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
Aimlessdata scaling
Cootmodel building

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2019-09-18
    Type: Initial release
  • Version 1.1: 2019-10-02
    Changes: Data collection, Database references
  • Version 1.2: 2023-11-22
    Changes: Data collection, Database references, Refinement description