9QPJ | pdb_00009qpj

Isopenicillin N synthase in complex with Fe and IPN using tr-SSX

• PDB DOI: https://doi.org/10.2210/pdb9QPJ/pdb

• Classification: OXIDOREDUCTASE
• Organism(s): Aspergillus nidulans FGSC A4
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2025-03-27 Released: 2026-04-08 
• Deposition Author(s): Rabe, P., Schofield, C.J., Stead, A.
• Funding Organization(s): Biotechnology and Biological Sciences Research Council (BBSRC), Wellcome Trust

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.90 Å
• R-Value Free: 
  0.238 (Depositor), 0.238 (DCC) 
• R-Value Work: 
  0.204 (Depositor), 0.204 (DCC) 
• R-Value Observed: 
  0.206 (Depositor) 

Starting Model: experimental

Literature

Isopenicillin N synthase in complex with Fe and IPN using tr-SSX

Rabe, P., Schofield, C.J., Stead, A.

To be published.

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: mass spectrometry

Macromolecule Content 

• Total Structure Weight: 38.08 kDa 
• Atom Count: 2,758 
• Modeled Residue Count: 329 
• Deposited Residue Count: 331 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Isopenicillin N synthase	A	331	Aspergillus nidulans FGSC A4	Mutation(s): 0  Gene Names: ipnA, ips, AN2622 EC: 1.21.3.1
UniProt
Find proteins for P05326 (Emericella nidulans (strain FGSC A4 / ATCC 38163 / CBS 112.46 / NRRL 194 / M139)) Explore P05326  Go to UniProtKB:  P05326

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
IP1 (Subject of Investigation/LOI)	D [auth A]	ISOPENICILLIN N C14 H21 N3 O6 S MIFYHUACUWQUKT-GTQWGBSQSA-N
SO4	C [auth A]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L
FE (Subject of Investigation/LOI)	B [auth A]	FE (III) ION Fe VTLYFUHAOXGGBS-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.90 Å
• R-Value Free:  0.238 (Depositor), 0.238 (DCC) 
• R-Value Work:  0.204 (Depositor), 0.204 (DCC) 
• R-Value Observed: 0.206 (Depositor) 

Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 41.915	α = 90
b = 75.236	β = 90
c = 101.841	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
PHENIX	refinement
DIALS	data reduction
DIALS	data scaling
PHASER	phasing

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2026-04-08 
Deposition Author(s): Rabe, P., Schofield, C.J., Stead, A.

---

Funding Organization	Location	Grant Number
Biotechnology and Biological Sciences Research Council (BBSRC)	United Kingdom	BB/V001892/1
Wellcome Trust	United Kingdom	227298/Z/23/Z

Revision History  

• Version 1.0: 2026-04-08
  Type: Initial release