9YTQ | pdb_00009ytq

Computationally Designed Tetramer of Apo-HC4 (C1 symmetry)

• PDB DOI: https://doi.org/10.2210/pdb9YTQ/pdb
• EM Map EMD-73489: EMDB EMDataResource

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


• Deposited: 2025-10-21 Released: 2026-02-25 
• Deposition Author(s): Eng, V.H., Narehood, S.M., Tezcan, F.A.
• Funding Organization(s): National Science Foundation (NSF, United States), National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 4.34 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Literature

Computational Design of a Highly Stable Dicopper Catechol Oxidase

Eng, V.H., Narehood, S.M., Li, Y., Gascon, M., Hoffnagle, A.M., Shiau, A.A., Semonis, M., Green, M.T., Britt, R.D., Tezcan, F.A.

(2026) J Am Chem Soc 

• DOI: https://doi.org/10.1021/jacs.5c18979

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 4-mer - A4 

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

Biological Assembly Evidence: equilibrium centrifugation

Macromolecule Content 

• Total Structure Weight: 64.93 kDa 
• Atom Count: 4,596 
• Modeled Residue Count: 552 
• Deposited Residue Count: 552 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Designed tetrameric HC4 protein.	A, B, C, D	138	synthetic construct	Mutation(s): 0

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 4.34 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

EM Software:

Task	Software Package	Version
RECONSTRUCTION	cryoSPARC	4.6.0
MODEL REFINEMENT	PHENIX

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2026-02-25 
Deposition Author(s): Eng, V.H., Narehood, S.M., Tezcan, F.A.

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Funding Organization	Location	Grant Number
National Science Foundation (NSF, United States)	United States	DGE-2038238
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)	United States	1R24GM154186
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)	United States	R01-GM138884

Revision History  

• Version 1.0: 2026-02-25
  Type: Initial release