9O4G | pdb_00009o4g

Cryo-EM structure of the CHSY3-CHPF1 chondroitin synthase heterodimer

• PDB DOI: https://doi.org/10.2210/pdb9O4G/pdb
• EM Map EMD-70100: EMDB EMDataResource

• Classification: SUGAR BINDING PROTEIN, TRANSFERASE
• Organism(s): Human adenovirus sp., Homo sapiens
• Expression System: Homo sapiens
• Mutation(s): No 


• Deposited: 2025-04-08 Released: 2026-03-04 
• Deposition Author(s): Tehari, D., Cortiella, N., Perez, C., Moremen, K.
• Funding Organization(s): National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS), Swiss National Science Foundation

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 3.42 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Literature

Structural basis of chondroitin sulfate backbone polymer synthesis

Tehari, D., Cortiella, N., Perez, C., Moremen, K.W.

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 (software)

Biological Assembly Evidence: electron microscopy

Macromolecule Content 

• Total Structure Weight: 179.6 kDa 
• Atom Count: 10,989 
• Modeled Residue Count: 1,368 
• Deposited Residue Count: 1,592 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Chondroitin sulfate synthase 3	A	851	Human adenovirus sp.	Mutation(s): 0  Gene Names: CHSY3, CHSY2, CSS3 EC: 2.4.1.175 (PDB Primary Data), 2.4.1.226 (PDB Primary Data)
UniProt & NIH Common Fund Data Resources
Find proteins for Q70JA7 (Homo sapiens) Explore Q70JA7  Go to UniProtKB:  Q70JA7
PHAROS:  Q70JA7 GTEx:  ENSG00000198108

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Chondroitin sulfate synthase 2	B	741	Homo sapiens	Mutation(s): 0  Gene Names: CHPF, CSS2, UNQ651/PRO1281 EC: 2.4.1.175 (PDB Primary Data), 2.4.1.226 (PDB Primary Data)
UniProt & NIH Common Fund Data Resources
Find proteins for Q8IZ52 (Homo sapiens) Explore Q8IZ52  Go to UniProtKB:  Q8IZ52
PHAROS:  Q8IZ52 GTEx:  ENSG00000123989

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
UDP (Subject of Investigation/LOI)	E [auth A]	URIDINE-5'-DIPHOSPHATE C9 H14 N2 O12 P2 XCCTYIAWTASOJW-XVFCMESISA-N
MN (Subject of Investigation/LOI)	C [auth A], D [auth A]	MANGANESE (II) ION Mn WAEMQWOKJMHJLA-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 3.42 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

EM Software:

Task	Software Package	Version
RECONSTRUCTION	cryoSPARC

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2026-03-04 
Deposition Author(s): Tehari, D., Cortiella, N., Perez, C., Moremen, K.

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Funding Organization	Location	Grant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)	United States	R01GM154846
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)	United States	R01GM130915
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)	United States	P41GM103390
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)	United States	R35GM158187
Swiss National Science Foundation	Switzerland	310030_207974

Revision History  

• Version 1.0: 2026-03-04
  Type: Initial release