9GAM | pdb_00009gam

X-ray structure of HCA(II)/aromatic foldamer complex

• PDB DOI: https://doi.org/10.2210/pdb9GAM/pdb

• Classification: PROTEIN BINDING
• Organism(s): Homo sapiens, synthetic construct
• Expression System: Escherichia coli 'BL21-Gold(DE3)pLysS AG
• Mutation(s): No 


• Deposited: 2024-07-29 Released: 2025-08-06 
• Deposition Author(s): Reddy, S.P., Langlois d'Estaintot, B., Fischer, L., Huc, I.
• Funding Organization(s): European Commission

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.40 Å
• R-Value Free: 
  0.182 (Depositor), 0.190 (DCC) 
• R-Value Work: 
  0.156 (Depositor), 0.166 (DCC) 
• R-Value Observed: 
  0.157 (Depositor) 

Starting Model: experimental

Literature

X-ray structure of HCA(II)/aromatic foldamer complex

Reddy, S.P., Langlois d'Estaintot, B., Fischer, L., Huc, I.

To be published.

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: homology, surface plasmon resonance

Macromolecule Content 

• Total Structure Weight: 32.8 kDa 
• Atom Count: 2,649 
• Modeled Residue Count: 273 
• Deposited Residue Count: 276 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Carbonic anhydrase 2	A	260	Homo sapiens	Mutation(s): 0  Gene Names: CA2 EC: 4.2.1.1 (PDB Primary Data), 4.2.1.69 (UniProt)
UniProt & NIH Common Fund Data Resources
Find proteins for P00918 (Homo sapiens) Explore P00918  Go to UniProtKB:  P00918
PHAROS:  P00918 GTEx:  ENSG00000104267

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Aromatic foldamer	B	16	synthetic construct	Mutation(s): 0

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
GOL	D [auth A], E [auth A], F [auth B], G [auth B]	GLYCEROL C3 H8 O3 PEDCQBHIVMGVHV-UHFFFAOYSA-N
ZN	C [auth A]	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.40 Å
• R-Value Free:  0.182 (Depositor), 0.190 (DCC) 
• R-Value Work:  0.156 (Depositor), 0.166 (DCC) 
• R-Value Observed: 0.157 (Depositor) 

Space Group: P 2₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 79.596	α = 90
b = 81.601	β = 90
c = 46.72	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
XDS	data scaling
XDS	data reduction
PHASER	phasing
PDB_EXTRACT	data extraction

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2025-08-06 
Deposition Author(s): Reddy, S.P., Langlois d'Estaintot, B., Fischer, L., Huc, I.

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Funding Organization	Location	Grant Number
European Commission	European Union	751019

Revision History  

• Version 1.0: 2025-08-06
  Type: Initial release