8TN7 | pdb_00008tn7

The Crystal Structure of a human monoclonal antibody (aAb), termed TG10, complexed with a disaccharide

• PDB DOI: https://doi.org/10.2210/pdb8TN7/pdb

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


• Deposited: 2023-08-01 Released: 2024-12-04 
• Deposition Author(s): Li, M., Wlodawer, A., Temme, S., Gildersleeve, J.
• Funding Organization(s): National Institutes of Health/National Cancer Institute (NIH/NCI)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.56 Å
• R-Value Free: 
  0.199 (Depositor), 0.208 (DCC) 
• R-Value Work: 
  0.170 (Depositor), 0.180 (DCC) 
• R-Value Observed: 
  0.171 (Depositor) 

Starting Model: experimental

Literature

Insights into biofilm architecture and maturation enable improved clinical strategies for exopolysaccharide-targeting therapeutics.

Temme, J.S., Tan, Z., Li, M., Yang, M., Wlodawer, A., Huang, X., Schneekloth Jr., J.S., Gildersleeve, J.C.

(2024) Cell Chem Biol 31: 2096-2111.e7

• PubMed: 39637855 
• DOI: https://doi.org/10.1016/j.chembiol.2024.11.005
• Primary Citation Related Structures: 
  8TN4, 8TN5, 8TN7


• PubMed Abstract: 
  

  Polysaccharide intercellular adhesin (PIA), an exopolysaccharide composed of poly-N-acetyl glucosamine (PNAG), is an essential component in many pathogenic biofilms. Partial deacetylation of PNAG is required for biofilm formation, but limited structural knowledge hinders therapeutic development. Employing a new monoclonal antibody (TG10) that selectively binds highly deacetylated PNAG and an antibody (F598) in clinical trials that binds highly acetylated PNAG, we demonstrate that PIA within the biofilm contains distinct regions of highly acetylated and deacetylated exopolysaccharide, contrary to the previous model invoking stochastic deacetylation throughout the biofilm. This discovery led us to hypothesize that targeting both forms of PNAG would enhance efficacy. Remarkably, TG10 and F598 synergistically increased in vitro and in vivo activity, providing 90% survival in a lethal Staphylococcus aureus challenge murine model. Our advanced model deepens the conceptual understanding of PIA architecture and maturation and reveals improved design strategies for PIA-targeting therapeutics, vaccines, and diagnostic agents.

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Organizational Affiliation: 
• Chemical Biology Laboratory, Center for Cancer Research, National Cancer Institute, Frederick, MD 21702, USA.
Department of Chemistry, Michigan State University, 578 S Shaw Lane, East Lansing, MI 48824, USA; Institute for Quantitative Health Science and Engineering, Michigan State University, East Lansing, MI 48824, USA.
Center for Structural Biology, Center for Cancer Research, National Cancer Institute, Frederick, MD 21702, USA; Basic Science Program, Frederick National Laboratory for Cancer Research, Frederick, MD 21702, USA.
Center for Structural Biology, Center for Cancer Research, National Cancer Institute, Frederick, MD 21702, USA.
Department of Chemistry, Michigan State University, 578 S Shaw Lane, East Lansing, MI 48824, USA; Institute for Quantitative Health Science and Engineering, Michigan State University, East Lansing, MI 48824, USA; Department of Biomedical Engineering, Michigan State University, East Lansing, MI 48824, USA.
Chemical Biology Laboratory, Center for Cancer Research, National Cancer Institute, Frederick, MD 21702, USA. Electronic address: [e-mail].

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: 48.12 kDa 
• Atom Count: 3,887 
• Modeled Residue Count: 434 
• Deposited Residue Count: 434 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
TG10, heavy chain	A [auth H]	220	Homo sapiens	Mutation(s): 0

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
TG10, Light chain	B [auth L]	214	Homo sapiens	Mutation(s): 0

Oligosaccharides

Help  

Entity ID: 3
Molecule	Chains	Length	2D Diagram	Glycosylation	D Interactions
2-amino-2-deoxy-beta-D-glucopyranose-(1-6)-2-amino-2-deoxy-beta-D-glucopyranose	C [auth A]	2		N/A

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
SO4	D [auth H], E [auth H], F [auth H], G [auth H], I [auth L], J [auth L], K [auth L], L, M [auth L]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L
CL	H	CHLORIDE ION Cl VEXZGXHMUGYJMC-UHFFFAOYSA-M

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.56 Å
• R-Value Free:  0.199 (Depositor), 0.208 (DCC) 
• R-Value Work:  0.170 (Depositor), 0.180 (DCC) 
• R-Value Observed: 0.171 (Depositor) 

Space Group: P 6₅ 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 91.095	α = 90
b = 91.095	β = 90
c = 202.254	γ = 120

Software Package:

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

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2024-12-04 
Deposition Author(s): Li, M., Wlodawer, A., Temme, S., Gildersleeve, J.

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Funding Organization	Location	Grant Number
National Institutes of Health/National Cancer Institute (NIH/NCI)	United States	--

Revision History  

• Version 1.0: 2024-12-04
  Type: Initial release
  
• Version 1.1: 2025-06-18
  Changes: Database references