9QOG | pdb_00009qog

Crystal structure of Nanofitin C10 in complex with a a double-helical aromatic oligoamide foldamer

• PDB DOI: https://doi.org/10.2210/pdb9QOG/pdb

• Classification: DE NOVO PROTEIN
• Organism(s): Sulfolobus acidocaldarius, synthetic construct
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2025-03-26 Released: 2026-04-08 
• Deposition Author(s): Sigl, J.C., Sachs, J., Merlet, E., Ferrand, Y., Huc, I.
• Funding Organization(s): Not funded

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.85 Å
• R-Value Free: 
  0.229 (Depositor), 0.229 (DCC) 
• R-Value Work: 
  0.187 (Depositor), 0.187 (DCC) 
• R-Value Observed: 
  0.191 (Depositor) 

Starting Model: experimental

Literature

Crystal structure of Nanofitin C10 in complex with a a double-helical aromatic oligoamide foldamer

Sigl, J.C., Sachs, J., Merlet, E., Ferrand, Y., Huc, I.

To be published.

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Hetero 4-mer - A2B2 Pseudo Symmetry: Asymmetric - C1 
Pseudo Stoichiometry: Hetero 4-mer - A2B1C1 

Biological assembly 1 assigned by authors.

Macromolecule Content 

• Total Structure Weight: 20.18 kDa 
• Atom Count: 1,610 
• Modeled Residue Count: 148 
• Deposited Residue Count: 152 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Nanofitin C10	A, B	66	Sulfolobus acidocaldarius	Mutation(s): 0

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Aromatic oligoamide foldamer	C, D	10	synthetic construct	Mutation(s): 0

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
PEG	F [auth C], H [auth D]	DI(HYDROXYETHYL)ETHER C4 H10 O3 MTHSVFCYNBDYFN-UHFFFAOYSA-N
SO4	E [auth A]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L
CL	G [auth C]	CHLORIDE ION Cl VEXZGXHMUGYJMC-UHFFFAOYSA-M

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.85 Å
• R-Value Free:  0.229 (Depositor), 0.229 (DCC) 
• R-Value Work:  0.187 (Depositor), 0.187 (DCC) 
• R-Value Observed: 0.191 (Depositor) 

Space Group: P 4 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 85.902	α = 90
b = 85.902	β = 90
c = 56.572	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
CrysalisPro	data reduction
CrysalisPro	data scaling
PHENIX	phasing

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2026-04-08 
Deposition Author(s): Sigl, J.C., Sachs, J., Merlet, E., Ferrand, Y., Huc, I.

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Funding Organization	Location	Grant Number
Not funded		--

Revision History  

• Version 1.0: 2026-04-08
  Type: Initial release