9T2I | pdb_00009t2i

SP100 nuclear antigen with crystallization epitope mutations N816D:T820R

• PDB DOI: https://doi.org/10.2210/pdb9T2I/pdb

• Classification: TRANSCRIPTION
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 2025-10-22 Released: 2026-02-25 
• Deposition Author(s): Fairhead, M., Strain-Damerell, C., Ye, M., Mackinnon, S.R., Pinkas, D., MacLean, E.M., Koekemoer, L., Damerell, D., Krojer, T., Arrowsmith, C.H., Edwards, A., Bountra, C., Yue, W., Burgess-Brown, N., Marsden, B., von Delft, F.
• Funding Organization(s): The Structural Genomics Consortium (SGC)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.35 Å
• R-Value Free: 
  0.185 (Depositor), 0.185 (DCC) 
• R-Value Work: 
  0.158 (Depositor), 0.158 (DCC) 

Starting Model: experimental

Literature

A fast, parallel method for efficiently exploring crystallization behaviour of large numbers of protein variants

Fairhead, M., Strain-Damerell, C., Ye, M., Mackinnon, S.R., Pinkas, D., MacLean, E.M., Koekemoer, L., Damerell, D., Krojer, T., Arrowsmith, C.H., Edwards, A., Bountra, C., Yue, W., Burgess-Brown, N., Marsden, B., von Delft, F.

To be published.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: gel filtration

Biological Assembly 2  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 2 assigned by authors.

Macromolecule Content 

• Total Structure Weight: 42.92 kDa 
• Atom Count: 3,273 
• Modeled Residue Count: 343 
• Deposited Residue Count: 356 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Isoform Sp100-C of Nuclear autoantigen Sp-100	A, B	178	Homo sapiens	Mutation(s): 2  Gene Names: SP100
UniProt & NIH Common Fund Data Resources
Find proteins for P23497 (Homo sapiens) Go to UniProtKB:  P23497
PHAROS:  P23497 GTEx:  ENSG00000067066

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ZN	C [auth A], D [auth A], E [auth A], F [auth B], G [auth B]	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.35 Å
• R-Value Free:  0.185 (Depositor), 0.185 (DCC) 
• R-Value Work:  0.158 (Depositor), 0.158 (DCC) 

Space Group: C 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 129.09	α = 90
b = 45.73	β = 102.37
c = 83.95	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
xia2	data reduction
xia2	data scaling
PHASER	phasing

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2026-02-25 
Deposition Author(s): Fairhead, M., Strain-Damerell, C., Ye, M., Mackinnon, S.R., Pinkas, D., MacLean, E.M., Koekemoer, L., Damerell, D., Krojer, T., Arrowsmith, C.H., Edwards, A., Bountra, C., Yue, W., Burgess-Brown, N., Marsden, B., von Delft, F.

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Funding Organization	Location	Grant Number
The Structural Genomics Consortium (SGC)	Canada	--

Revision History  

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