6KJG

Crystal structure of PsoF

• PDB DOI: https://doi.org/10.2210/pdb6KJG/pdb

• Classification: OXIDOREDUCTASE
• Organism(s): Aspergillus fumigatus Af293
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2019-07-22 Released: 2019-09-18 
• Deposition Author(s): Hara, K., Hashimoto, H., Matsushita, T., Tsunematsu, Y., Watanabe, K.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.99 Å
• R-Value Free: 
  0.230 (Depositor), 0.230 (DCC) 
• R-Value Work: 
  0.197 (Depositor), 0.200 (DCC) 
• R-Value Observed: 
  0.198 (Depositor) 

Starting Model: experimental

Literature

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

• PubMed: 31486637 
• 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.

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Organizational Affiliation: 

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

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: gel filtration

Biological Assembly 2  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 2 assigned by authors.

Biological Assembly 3  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 3 assigned by authors.

Macromolecule Content

• Total Structure Weight: 125.2 kDa 
• Atom Count: 8,613 
• Modelled Residue Count: 1,045 
• Deposited Residue Count: 1,134 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Dual-functional monooxygenase/methyltransferase psoF	A, B, C	378	Aspergillus fumigatus Af293	Mutation(s): 0  Gene Names: psoF, AFUA_8G00440 EC: 1 (PDB Primary Data), 2.1.1 (PDB Primary Data)
UniProt
Find proteins for Q4WAZ0 (Aspergillus fumigatus (strain ATCC MYA-4609 / CBS 101355 / FGSC A1100 / Af293)) Explore Q4WAZ0  Go to UniProtKB:  Q4WAZ0

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.99 Å
• R-Value Free:  0.230 (Depositor), 0.230 (DCC) 
• R-Value Work:  0.197 (Depositor), 0.200 (DCC) 
• R-Value Observed: 0.198 (Depositor) 

Space Group: C 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 189.238	α = 90
b = 44.102	β = 93.59
c = 142.616	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
XDS	data reduction
Aimless	data scaling
PHASER	phasing
Coot	model building

Structure Validation

Entry History 

Deposition Data

• Released Date: 2019-09-18 
Deposition Author(s): Hara, K., Hashimoto, H., Matsushita, T., Tsunematsu, Y., Watanabe, K.

Revision History  

• 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