12PY | pdb_000012py

Crystal structure of unbound CM11.1 Fab

• PDB DOI: https://doi.org/10.2210/pdb12PY/pdb

• Classification: IMMUNE SYSTEM
• Organism(s): Macaca mulatta
• Expression System: Macaca mulatta
• Mutation(s): No 


• Deposited: 2026-04-14 Released: 2026-06-24 
• Deposition Author(s): Niyongabo, A., Janus, B.M., Lemmer, A., Ofek, G.
• Funding Organization(s): Other government

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.73 Å
• R-Value Free: 
  0.265 (Depositor), 0.266 (DCC) 
• R-Value Work: 
  0.218 (Depositor), 0.218 (DCC) 
• R-Value Observed: 
  0.223 (Depositor) 

Starting Model: experimental

Literature

Crystal structure of unbound CM11.1 Fab

Niyongabo, A., Janus, B.M., Ofek, G.

To be published.

Biological Assembly 1  

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

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

Macromolecule Content 

• Total Structure Weight: 46.7 kDa 
• Atom Count: 3,216 
• Modeled Residue Count: 432 
• Deposited Residue Count: 440 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
CM11.1 Fab heavy chain	A [auth H]	224	Macaca mulatta	Mutation(s): 0

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
CM11.1 Fab light chain	B [auth L]	216	Macaca mulatta	Mutation(s): 0

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.73 Å
• R-Value Free:  0.265 (Depositor), 0.266 (DCC) 
• R-Value Work:  0.218 (Depositor), 0.218 (DCC) 
• R-Value Observed: 0.223 (Depositor) 

Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 57.379	α = 90
b = 70.685	β = 90
c = 109.139	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
HKL-2000	data reduction
HKL-2000	data scaling
PHENIX	phasing

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2026-06-24 
Deposition Author(s): Niyongabo, A., Janus, B.M., Lemmer, A., Ofek, G.

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Funding Organization	Location	Grant Number
Other government	United States	--

Revision History  

• Version 1.0: 2026-06-24
  Type: Initial release