9ON3 | pdb_00009on3

Cryo-EM structure of the salivary protein complex Saglin-SGS4 from Anopheles gambiae

• PDB DOI: https://doi.org/10.2210/pdb9ON3/pdb
• EM Map EMD-70628: EMDB EMDataResource

• Classification: ALLERGEN
• Organism(s): Anopheles gambiae
• Mutation(s): No 


• Deposited: 2025-05-14 Released: 2026-05-27 
• Deposition Author(s): Su, T., Liu, S., Williams, A.E., Calvo, E., Zhou, Z.H.
• Funding Organization(s): National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS), National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 3.40 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Literature

Cryo-EM structure of the salivary protein complex Saglin-SGS4 from Anopheles gambiae

Su, T., Liu, S., Williams, A.E., Calvo, E., Zhou, Z.H.

To be published.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 3-mer - A2B1 

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

Biological Assembly Evidence: electron microscopy

Macromolecule Content 

• Total Structure Weight: 484.12 kDa 
• Atom Count: 28,611 
• Modeled Residue Count: 3,500 
• Deposited Residue Count: 4,182 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
SGS4	A	3,398	Anopheles gambiae	Mutation(s): 0
UniProt
Find proteins for Q5XLG7 (Anopheles gambiae) Explore Q5XLG7  Go to UniProtKB:  Q5XLG7
Glycosylation
Glycosylation Sites: 9

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Saglin	B, C	392	Anopheles gambiae	Mutation(s): 0
UniProt
Find proteins for F7IW82 (Anopheles gambiae) Explore F7IW82  Go to UniProtKB:  F7IW82
Glycosylation
Glycosylation Sites: 1

Oligosaccharides

Help  

Entity ID: 3
Molecule	Chains	Length	2D Diagram	Glycosylation	D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose	D, F, G, I, J	2		N-Glycosylation

Entity ID: 4
Molecule	Chains	Length	2D Diagram	Glycosylation	D Interactions
beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose	E, H	3		N-Glycosylation

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
NAG (Subject of Investigation/LOI)	K [auth A], L [auth A], M [auth B]	2-acetamido-2-deoxy-beta-D-glucopyranose C8 H15 N O6 OVRNDRQMDRJTHS-FMDGEEDCSA-N

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 3.40 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

EM Software:

Task	Software Package	Version
RECONSTRUCTION	cryoSPARC
MODEL REFINEMENT	PHENIX

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2026-05-27 
Deposition Author(s): Su, T., Liu, S., Williams, A.E., Calvo, E., Zhou, Z.H.

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Funding Organization	Location	Grant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)	United States	R01GM071940
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)	United States	AI001246

Revision History  

• Version 1.0: 2026-05-27
  Type: Initial release