9I0E | pdb_00009i0e

Crystal structure of the non-heme domain from PgcA - Wildtype

• PDB DOI: https://doi.org/10.2210/pdb9I0E/pdb

• Classification: ELECTRON TRANSPORT
• Organism(s): Geobacter sulfurreducens PCA
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2025-01-14 Released: 2026-01-21 
• Deposition Author(s): Nash, B.W., Clarke, T.A.
• Funding Organization(s): Biotechnology and Biological Sciences Research Council (BBSRC)

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.65 Å
• R-Value Free: 
  0.190 (Depositor), 0.191 (DCC) 
• R-Value Work: 
  0.166 (Depositor), 0.166 (DCC) 
• R-Value Observed: 
  0.167 (Depositor) 

Starting Model: in silico

Literature

Structural and functional basis for autoproteolytic-secretion of the tethered-heme protein PgcA

Nash, B.W., Clarke, T.A.

To be published.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Biological Assembly Evidence: gel filtration

Macromolecule Content 

• Total Structure Weight: 21.42 kDa 
• Atom Count: 1,649 
• Modeled Residue Count: 201 
• Deposited Residue Count: 212 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Lipoprotein cytochrome c	A	195	Geobacter sulfurreducens PCA	Mutation(s): 0  Gene Names: pgcA, GSU1761
UniProt
Find proteins for Q74CB3 (Geobacter sulfurreducens (strain ATCC 51573 / DSM 12127 / PCA)) Explore Q74CB3  Go to UniProtKB:  Q74CB3

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
PgcA non-heme domain cleavage fragment	B	17	Geobacter sulfurreducens PCA	Mutation(s): 0

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
SO4	C [auth A], D [auth A], E [auth A]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L
GOL	F [auth A]	GLYCEROL C3 H8 O3 PEDCQBHIVMGVHV-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.65 Å
• R-Value Free:  0.190 (Depositor), 0.191 (DCC) 
• R-Value Work:  0.166 (Depositor), 0.166 (DCC) 
• R-Value Observed: 0.167 (Depositor) 

Space Group: P 6₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 96.756	α = 90
b = 96.756	β = 90
c = 35.916	γ = 120

Software Package:

Software Name	Purpose
PHENIX	refinement
xia2	data scaling
xia2	data reduction
PHASER	phasing

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2026-01-21 
Deposition Author(s): Nash, B.W., Clarke, T.A.

---

Funding Organization	Location	Grant Number
Biotechnology and Biological Sciences Research Council (BBSRC)	United Kingdom	BB/T008717/1

Revision History  

• Version 1.0: 2026-01-21
  Type: Initial release