9S4Y | pdb_00009s4y

AcuB from Geobacillus stearothermophilus with Ap4A

• PDB DOI: https://doi.org/10.2210/pdb9S4Y/pdb

• Classification: DNA BINDING PROTEIN
• Organism(s): Bacillus subtilis subsp. subtilis str. 168
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2025-07-28 Released: 2026-02-25 
• Deposition Author(s): Janetzky, M., Palm, G.J., Lammers, M.
• Funding Organization(s): Not funded

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.35 Å
• R-Value Free: 
  0.262 (Depositor), 0.269 (DCC) 
• R-Value Work: 
  0.229 (Depositor), 0.233 (DCC) 

Starting Model: in silico

Literature

AcsA and Acu operon regulation by AcuB

Janetzky, M., Palm, G.J., Lammers, M.

To be published.

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: gel filtration

Macromolecule Content 

• Total Structure Weight: 51.27 kDa 
• Atom Count: 3,262 
• Modeled Residue Count: 402 
• Deposited Residue Count: 446 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
AcuB from Geobacillus stearothermophilus	A, B	223	Bacillus subtilis subsp. subtilis str. 168	Mutation(s): 0

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
B4P (Subject of Investigation/LOI)	C [auth A], E [auth B]	BIS(ADENOSINE)-5'-TETRAPHOSPHATE C20 H28 N10 O19 P4 YOAHKNVSNCMZGQ-XPWFQUROSA-N
CL (Subject of Investigation/LOI)	D [auth A], F [auth B]	CHLORIDE ION Cl VEXZGXHMUGYJMC-UHFFFAOYSA-M

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.35 Å
• R-Value Free:  0.262 (Depositor), 0.269 (DCC) 
• R-Value Work:  0.229 (Depositor), 0.233 (DCC) 

Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 52.295	α = 90
b = 96.954	β = 90
c = 101.709	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
XDS	data reduction
XSCALE	data scaling
PHASER	phasing

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2026-02-25 
Deposition Author(s): Janetzky, M., Palm, G.J., Lammers, M.

---

Funding Organization	Location	Grant Number
Not funded		--

Revision History  

• Version 1.0: 2026-02-25
  Type: Initial release