Biological Assembly 1  

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

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

Macromolecule Content

• Total Structure Weight: 19.83 kDa 
• Atom Count: 1,523 
• Modelled Residue Count: 171 
• Deposited Residue Count: 182 
• Unique protein chains: 1

 6CWM

Crystal structure of SpaA-SLH/G109A

• PDB DOI:  https://doi.org/10.2210/pdb6CWM/pdb

• Classification: SUGAR BINDING PROTEIN
• Organism(s): Paenibacillus alvei
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): Yes 


• Deposited: 2018-03-30 Released: 2018-08-15 
• Deposition Author(s): Blackler, R.J., Evans, S.V.
• Funding Organization(s): Natural Sciences and Engineering Research Council (NSERC, Canada), Austrian Science Fund

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.15 Å
• R-Value Free: 0.159 
• R-Value Work: 0.131 
• R-Value Observed: 0.132 

Literature

Structural basis of cell wall anchoring by SLH domains in Paenibacillus alvei.

Blackler, R.J., Lopez-Guzman, A., Hager, F.F., Janesch, B., Martinz, G., Gagnon, S.M.L., Haji-Ghassemi, O., Kosma, P., Messner, P., Schaffer, C., Evans, S.V.

(2018) Nat Commun 9: 3120-3120

• PubMed: 30087354 
• DOI: https://doi.org/10.1038/s41467-018-05471-3
• Primary Citation of Related Structures:  
  6CWC, 6CWF, 6CWH, 6CWI, 6CWL, 6CWM, 6CWN, 6CWR


• PubMed Abstract: 
  

Self-assembling protein surface (S-) layers are common cell envelope structures of prokaryotes and have critical roles from structural maintenance to virulence. S-layers of Gram-positive bacteria are often attached through the interaction of S-layer homology (SLH) domain trimers with peptidoglycan-linked secondary cell wall polymers (SCWPs). Here we present an in-depth characterization of this interaction, with co-crystal structures of the three consecutive SLH domains from the Paenibacillus alvei S-layer protein SpaA with defined SCWP ligands. The most highly conserved SLH domain residue SLH-Gly29 is shown to enable a peptide backbone flip essential for SCWP binding in both biophysical and cellular experiments. Furthermore, we find that a significant domain movement mediates binding by two different sites in the SLH domain trimer, which may allow anchoring readjustment to relieve S-layer strain caused by cell growth and division.

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Organizational Affiliation: 

Department of Biochemistry and Microbiology, University of Victoria, Victoria, BC, V8W 3P6, Canada. [e-mail].

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Surface (S-) layer glycoprotein	A	182	Paenibacillus alvei	Mutation(s): 1  Gene Names: spaA
UniProt
Find proteins for C1JZ07 (Paenibacillus alvei) Explore C1JZ07  Go to UniProtKB:  C1JZ07

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
CL	B [auth A]	CHLORIDE ION Cl VEXZGXHMUGYJMC-UHFFFAOYSA-M

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.15 Å
• R-Value Free: 0.159 
• R-Value Work: 0.131 
• R-Value Observed: 0.132 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 34.348	α = 90
b = 65.668	β = 90
c = 73.168	γ = 90

Software Package:

Software Name	Purpose
HKL-2000	data scaling
REFMAC	refinement
PDB_EXTRACT	data extraction
HKL-2000	data reduction
PHASER	phasing

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2018-08-15 
Deposition Author(s): Blackler, R.J., Evans, S.V.

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Funding Organization	Location	Grant Number
Natural Sciences and Engineering Research Council (NSERC, Canada)	Canada	CGSD3-426678-2012
Austrian Science Fund	Austria	P22791-B12
Austrian Science Fund	Austria	P27374-B22

Revision History  

• Version 1.0: 2018-08-15
  Type: Initial release
  
• Version 1.1: 2018-08-22
  Changes: Data collection, Database references
• Version 1.2: 2020-01-08
  Changes: Author supporting evidence