9QBS | pdb_00009qbs

KEAP1 complexed to cyclic peptide 33

• PDB DOI: https://doi.org/10.2210/pdb9QBS/pdb

• Classification: STRUCTURAL PROTEIN
• Organism(s): Homo sapiens, synthetic construct
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 2025-03-03 Released: 2026-03-18 
• Deposition Author(s): Xinjian, J., Kelvin, L.
• Funding Organization(s): Swiss National Science Foundation

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.95 Å
• R-Value Free: 
  0.201 (Depositor), 0.201 (DCC) 
• R-Value Work: 
  0.168 (Depositor), 0.168 (DCC) 
• R-Value Observed: 
  0.170 (Depositor) 

Starting Model: experimental

Literature

De novo development of membrane-permeable cyclic peptides for modulating intracellular protein-protein interactions

Xinjian, J., Kelvin, L.

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: surface plasmon resonance

Biological Assembly 2  

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

Biological assembly 2 assigned by authors.

Macromolecule Content 

• Total Structure Weight: 65.57 kDa 
• Atom Count: 4,923 
• Modeled Residue Count: 578 
• Deposited Residue Count: 590 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Kelch-like ECH-associated protein 1	A, B	290	Homo sapiens	Mutation(s): 2  Gene Names: KEAP1, INRF2, KIAA0132, KLHL19
UniProt & NIH Common Fund Data Resources
Find proteins for Q14145 (Homo sapiens) Explore Q14145  Go to UniProtKB:  Q14145
PHAROS:  Q14145 GTEx:  ENSG00000079999

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Cyclic peptide	C, D	5	synthetic construct	Mutation(s): 0

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
GOL	E [auth A], F [auth A], H [auth A], J [auth B]	GLYCEROL C3 H8 O3 PEDCQBHIVMGVHV-UHFFFAOYSA-N
EDO	G [auth A], I [auth A], K [auth B]	1,2-ETHANEDIOL C2 H6 O2 LYCAIKOWRPUZTN-UHFFFAOYSA-N

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
ABA	C, D	L-PEPTIDE LINKING	C4 H9 N O2		ALA

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.95 Å
• R-Value Free:  0.201 (Depositor), 0.201 (DCC) 
• R-Value Work:  0.168 (Depositor), 0.168 (DCC) 
• R-Value Observed: 0.170 (Depositor) 

Diffraction Data: https://doi.org/10.18430/m39qbs

Space Group: P 4₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 100.847	α = 90
b = 100.847	β = 90
c = 126.764	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
XDS	data reduction
Aimless	data scaling
PHASER	phasing
autoPROC	data processing

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2026-03-18 
Deposition Author(s): Xinjian, J., Kelvin, L.

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Funding Organization	Location	Grant Number
Swiss National Science Foundation	Switzerland	--

Revision History  

• Version 1.0: 2026-03-18
  Type: Initial release