9NOA | pdb_00009noa

Crystal structure of unliganded Fab MS-1805

• PDB DOI: https://doi.org/10.2210/pdb9NOA/pdb

• Classification: IMMUNE SYSTEM
• Organism(s): Homo sapiens
• Expression System: Cricetulus griseus
• Mutation(s): No 


• Deposited: 2025-03-08 Released: 2026-03-18 
• Deposition Author(s): Jain, M., Wilson, I.A.
• Funding Organization(s): Bill & Melinda Gates Foundation

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.77 Å
• R-Value Free: 
  0.231 (Depositor), 0.231 (DCC) 
• R-Value Work: 
  0.204 (Depositor), 0.204 (DCC) 
• R-Value Observed: 
  0.205 (Depositor) 

Literature

Crystal structure of unliganded Fab MS-1805

Jain, M., Wilson, I.A.

To be published.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 Pseudo Symmetry: Cyclic - C2  (Explore in 3D)
Pseudo Stoichiometry: Homo 2-mer - A2 

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

Biological Assembly 2  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 Pseudo Symmetry: Cyclic - C2  (Explore in 3D)
Pseudo Stoichiometry: Homo 2-mer - A2 

Biological assembly 2 assigned by authors and generated by PISA (software)

Macromolecule Content 

• Total Structure Weight: 95.84 kDa 
• Atom Count: 6,955 
• Modeled Residue Count: 859 
• Deposited Residue Count: 884 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
MS-1805 Fab Heavy Chain	A, C	227	Homo sapiens	Mutation(s): 0

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
MS-1805 Fab Light Chain	B, D	215	Homo sapiens	Mutation(s): 0

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.77 Å
• R-Value Free:  0.231 (Depositor), 0.231 (DCC) 
• R-Value Work:  0.204 (Depositor), 0.204 (DCC) 
• R-Value Observed: 0.205 (Depositor) 

Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 40.568	α = 90
b = 145.402	β = 91.44
c = 76.735	γ = 90

Software Package:

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

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2026-03-18 
Deposition Author(s): Jain, M., Wilson, I.A.

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Funding Organization	Location	Grant Number
Bill & Melinda Gates Foundation	United States	INV-004923
Bill & Melinda Gates Foundation	United States	INV-056202

Revision History  

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