9WIP | pdb_00009wip

Crystal structure of ADC-227 in the free form

• PDB DOI: https://doi.org/10.2210/pdb9WIP/pdb

• Classification: HYDROLASE
• Organism(s): Acinetobacter baumannii
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2025-08-29 Released: 2026-03-25 
• Deposition Author(s): Kawai, A., Doi, Y.
• Funding Organization(s): National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID), Japan Society for the Promotion of Science (JSPS)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.95 Å
• R-Value Free: 
  0.214 (Depositor), 0.215 (DCC) 
• R-Value Work: 
  0.202 (Depositor), 0.202 (DCC) 

Starting Model: experimental

Literature

Stable cefiderocol resistance mediated by a valine substitution at position 293 combined with an alanine duplication in the omega loop of ADC beta-lactamase in Acinetobacter baumannii

Kawai, A., Doi, Y.

(2026) mBio 

• DOI: https://doi.org/10.1128/mbio.03518-25

Biological Assembly 1  

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

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

Macromolecule Content 

• Total Structure Weight: 41.27 kDa 
• Atom Count: 3,035 
• Modeled Residue Count: 361 
• Deposited Residue Count: 363 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Beta-lactamase	A	363	Acinetobacter baumannii	Mutation(s): 0  Gene Names: ampC EC: 3.5.2.6

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
EPE	B [auth A]	4-(2-HYDROXYETHYL)-1-PIPERAZINE ETHANESULFONIC ACID C8 H18 N2 O4 S JKMHFZQWWAIEOD-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.95 Å
• R-Value Free:  0.214 (Depositor), 0.215 (DCC) 
• R-Value Work:  0.202 (Depositor), 0.202 (DCC) 

Space Group: P 3₁ 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 76.008	α = 90
b = 76.008	β = 90
c = 97.832	γ = 120

Software Package:

Software Name	Purpose
PHENIX	refinement
XDS	data reduction
XDS	data scaling
MOLREP	phasing

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2026-03-25 
Deposition Author(s): Kawai, A., Doi, Y.

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Funding Organization	Location	Grant Number
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)	United States	R21AI151362
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)	United States	5UM1AI104681
Japan Society for the Promotion of Science (JSPS)	Japan	JP23K06267

Revision History  

• Version 1.0: 2026-03-25
  Type: Initial release