9Q5E | pdb_00009q5e

Hsa bound to Neu5Ac alpha2,3 Gal beta OMe

• PDB DOI: https://doi.org/10.2210/pdb9Q5E/pdb
• Entry: 9Q5E supersedes: 8ST5

• Classification: SUGAR BINDING PROTEIN
• Organism(s): Streptococcus
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 2025-08-20 Released: 2025-11-26 
• Deposition Author(s): Iverson, T.M.
• Funding Organization(s): National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.29 Å
• R-Value Free: 
  0.191 (Depositor), 0.191 (DCC) 
• R-Value Work: 
  0.161 (Depositor), 0.161 (DCC) 
• R-Value Observed: 
  0.163 (Depositor) 

Starting Model: experimental

Literature

Hsa bound to Neu5Ac alpha2,3 Gal beta OMe

Iverson, T.M.

To be published.

Biological Assembly 1  

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

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

Biological Assembly Evidence: gel filtration

Macromolecule Content 

• Total Structure Weight: 23.64 kDa 
• Atom Count: 1,981 
• Modeled Residue Count: 205 
• Deposited Residue Count: 209 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Streptococcal hemagglutinin	A	209	Streptococcus	Mutation(s): 1  Gene Names: hsa, SGO_0966
UniProt
Find proteins for A8AWU7 (Streptococcus gordonii (strain Challis / ATCC 35105 / BCRC 15272 / CH1 / DL1 / V288)) Explore A8AWU7  Go to UniProtKB:  A8AWU7

Oligosaccharides

Help

Entity ID: 2
Molecule	Chains	Length	2D Diagram	Glycosylation	3D Interactions
N-acetyl-alpha-neuraminic acid-(2-3)-methyl beta-D-galactopyranoside	B	2		N/A
Glycosylation Resources
GlyTouCan:  G61011EC GlyCosmos:  G61011EC

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
CA	C [auth A]	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N
NA	D [auth A]	SODIUM ION Na FKNQFGJONOIPTF-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.29 Å
• R-Value Free:  0.191 (Depositor), 0.191 (DCC) 
• R-Value Work:  0.161 (Depositor), 0.161 (DCC) 
• R-Value Observed: 0.163 (Depositor) 

Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 45.302	α = 90
b = 57.567	β = 90
c = 75.685	γ = 90

Software Package:

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

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2025-11-26 
Deposition Author(s): Iverson, T.M.
• This entry supersedes: 8ST5

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Funding Organization	Location	Grant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)	United States	--

Revision History  

• Version 1.0: 2025-11-26
  Type: Initial release