9KA2 | pdb_00009ka2

Crystal structure of beta-ketoacyl-ACP synthase FabH from E. coli

• PDB DOI: https://doi.org/10.2210/pdb9KA2/pdb

• Classification: BIOSYNTHETIC PROTEIN
• Organism(s): Escherichia coli
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2024-10-28 Released: 2025-09-10 
• Deposition Author(s): Zhang, L., Zhang, L., Cai, C.
• Funding Organization(s): National Natural Science Foundation of China (NSFC)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.50 Å
• R-Value Free: 
  0.198 (Depositor), 0.200 (DCC) 
• R-Value Work: 
  0.185 (Depositor), 0.186 (DCC) 
• R-Value Observed: 
  0.186 (Depositor) 

Starting Model: experimental

Literature

The Molecular Basis of the beta-Ketoacyl-ACP Synthase FabH in Catalyzing C-C Bond Formation of Acetoacetyl-ACP

Cai, C., Huang, Y., Zhang, L., Zhang, L.

(2025) ACS Catal 15: 5028-5038

• DOI: https://doi.org/10.1021/acscatal.5c01167

Biological Assembly 1  

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

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

Biological Assembly Evidence: gel filtration

Macromolecule Content 

• Total Structure Weight: 71.44 kDa 
• Atom Count: 5,316 
• Modeled Residue Count: 634 
• Deposited Residue Count: 674 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Beta-ketoacyl-[acyl-carrier-protein] synthase III	A, B	337	Escherichia coli	Mutation(s): 0  Gene Names: fabH, b1091, JW1077 EC: 2.3.1.180
UniProt
Find proteins for P0A6R0 (Escherichia coli (strain K12)) Explore P0A6R0  Go to UniProtKB:  P0A6R0

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.50 Å
• R-Value Free:  0.198 (Depositor), 0.200 (DCC) 
• R-Value Work:  0.185 (Depositor), 0.186 (DCC) 
• R-Value Observed: 0.186 (Depositor) 

Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 64.267	α = 90
b = 64.539	β = 90
c = 164.952	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
Aimless	data scaling
HKL-3000	data reduction
PHENIX	phasing

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2025-09-10 
Deposition Author(s): Zhang, L., Zhang, L., Cai, C.

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Funding Organization	Location	Grant Number
National Natural Science Foundation of China (NSFC)	China	22477077

Revision History  

• Version 1.0: 2025-09-10
  Type: Initial release