8TB2 | pdb_00008tb2

Structure of SasG (type II) (residues 165-421) from Staphylococcus aureus MW2

• PDB DOI: https://doi.org/10.2210/pdb8TB2/pdb

• Classification: CELL ADHESION
• Organism(s): Staphylococcus aureus subsp. aureus MW2
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2023-06-28 Released: 2024-05-08 
• Deposition Author(s): Maciag, J.J., Herr, A.B.
• 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: X-RAY DIFFRACTION
• Resolution: 1.88 Å
• R-Value Free: 
  0.253 (Depositor), 0.253 (DCC) 
• R-Value Work: 
  0.184 (Depositor), 0.185 (DCC) 

Starting Model: experimental

Literature

Staphylococcus aureus skin colonization is mediated by SasG lectin variation.

Mills, K.B., Maciag, J.J., Wang, C., Crawford, J.A., Enroth, T.J., Keim, K.C., Dufrene, Y.F., Robinson, D.A., Fey, P.D., Herr, A.B., Horswill, A.R.

(2024) Cell Rep 43: 114022-114022

• PubMed: 38568806 
• DOI: https://doi.org/10.1016/j.celrep.2024.114022
• Primary Citation Related Structures: 
  8TB2


• PubMed Abstract: 
  

  Staphylococcus aureus causes the majority of skin and soft tissue infections, but this pathogen only transiently colonizes healthy skin. However, this transient skin exposure enables S. aureus to transition to infection. The initial adhesion of S. aureus to skin corneocytes is mediated by surface protein G (SasG). Here, phylogenetic analyses reveal the presence of two major divergent SasG alleles in S. aureus: SasG-I and SasG-II. Structural analyses of SasG-II identify a nonaromatic arginine in the binding pocket of the lectin subdomain that mediates adhesion to corneocytes. Atomic force microscopy and corneocyte adhesion assays indicate that SasG-II can bind to a broader variety of ligands than SasG-I. Glycosidase treatment results in different binding profiles between SasG-I and SasG-II on skin cells. In addition, SasG-mediated adhesion is recapitulated using differentiated N/TERT keratinocytes. Our findings indicate that SasG-II has evolved to adhere to multiple ligands, conferring a distinct advantage to S. aureus during skin colonization.

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Organizational Affiliation: 
• Department of Immunology and Microbiology, University of Colorado Anschutz Medical Campus, Aurora, CO, USA.
Division of Immunobiology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA.
Louvain Institute of Biomolecular Science and Technology, UCLouvain, Louvain-la-Neuve, Belgium.
Department of Cell and Molecular Biology, University of Mississippi Medical Center, Jackson, MS, USA.
Department of Cell and Molecular Biology, University of Mississippi Medical Center, Jackson, MS, USA; Center for Immunology and Microbial Research, University of Mississippi Medical Center, Jackson, MS, USA.
Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha, NE, USA.
Division of Immunobiology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA; Division of Infectious Diseases, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA; Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH, USA.
Department of Immunology and Microbiology, University of Colorado Anschutz Medical Campus, Aurora, CO, USA; Department of Veterans Affairs, VA Eastern Colorado Healthcare System, Aurora, CO, USA. Electronic address: [e-mail].

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Macromolecule Content 

• Total Structure Weight: 29.5 kDa 
• Atom Count: 2,052 
• Modeled Residue Count: 259 
• Deposited Residue Count: 262 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Putative surface protein MW2416	A	262	Staphylococcus aureus subsp. aureus MW2	Mutation(s): 0  Gene Names: MW2416
UniProt
Find proteins for Q8NUV0 (Staphylococcus aureus (strain MW2)) Explore Q8NUV0  Go to UniProtKB:  Q8NUV0

Small Molecules

Ligands 4 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
SO4	B [auth A], C [auth A], D [auth A], E [auth A]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L
ZN	I [auth A], J [auth A], K [auth A]	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N
CA (Subject of Investigation/LOI)	F [auth A], G [auth A]	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N
NA	H [auth A]	SODIUM ION Na FKNQFGJONOIPTF-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.88 Å
• R-Value Free:  0.253 (Depositor), 0.253 (DCC) 
• R-Value Work:  0.184 (Depositor), 0.185 (DCC) 

Space Group: P 2₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 78.6	α = 90
b = 70.21	β = 90
c = 43.54	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
MOSFLM	data reduction
Aimless	data scaling
PHASER	phasing

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2024-05-08 
Deposition Author(s): Maciag, J.J., Herr, A.B.

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Funding Organization	Location	Grant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)	United States	R01 GM094363
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)	United States	R01 AI162964

Revision History  

• Version 1.0: 2024-05-08
  Type: Initial release