7BK8

X-ray crystal structure of Pseudomonas aeruginosa MagC

• PDB DOI: https://doi.org/10.2210/pdb7BK8/pdb

• Classification: HYDROLASE
• Organism(s): Pseudomonas aeruginosa PAO1
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2021-01-15 Released: 2021-07-21 
• Deposition Author(s): Zouhir, S., Contreras-Martel, C., Maragno Trindade, D., Attree, I., Dessen, A., Macheboeuf, P.
• Funding Organization(s): Sao Paulo Research Foundation (FAPESP), French Infrastructure for Integrated Structural Biology (FRISBI)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.74 Å
• R-Value Free: 0.222 
• R-Value Work: 0.193 

Literature

MagC is a NplC/P60-like member of the alpha-2-macroglobulin Mag complex of Pseudomonas aeruginosa that interacts with peptidoglycan.

Zouhir, S., Contreras-Martel, C., Maragno Trindade, D., Attree, I., Dessen, A., Macheboeuf, P.

(2021) FEBS Lett 595: 2034-2046

• PubMed: 34115884 
• DOI: https://doi.org/10.1002/1873-3468.14148
• Primary Citation of Related Structures:  
  7BK8


• PubMed Abstract: 
  

  Bacterial α-2 macroglobulins (A2Ms) structurally resemble the large spectrum protease inhibitors of the eukaryotic immune system. In Pseudomonas aeruginosa, MagD acts as an A2M and is expressed within a six-gene operon encoding the MagA-F proteins. In this work, we employ isothermal calorimetry (ITC), analytical ultracentrifugation (AUC), and X-ray crystallography to investigate the function of MagC and show that MagC associates with the macroglobulin complex and with the peptidoglycan (PG). However, the catalytic residues of MagC display an inactive conformation that could suggest that it binds to PG but does not degrade it. We hypothesize that MagC could serve as an anchor between the MagD macroglobulin and the PG and could provide stabilization and/or regulation for the entire complex.

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Organizational Affiliation: 

Brazilian Biosciences National Laboratory (LNBio), CNPEM, Campinas, Brazil.

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, isothermal titration calorimetry

Macromolecule Content

• Total Structure Weight: 24.12 kDa 
• Atom Count: 1,632 
• Modelled Residue Count: 192 
• Deposited Residue Count: 212 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
MagC	A	212	Pseudomonas aeruginosa PAO1	Mutation(s): 0  Gene Names: PA4490
UniProt
Find proteins for Q9HVT1 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1)) Explore Q9HVT1  Go to UniProtKB:  Q9HVT1

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
PO4	B [auth A]	PHOSPHATE ION O4 P NBIIXXVUZAFLBC-UHFFFAOYSA-K

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.74 Å
• R-Value Free: 0.222 
• R-Value Work: 0.193 
• Space Group: H 3

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 110.737	α = 90
b = 110.737	β = 90
c = 41.11	γ = 120

Software Package:

Software Name	Purpose
REFMAC	refinement
XDS	data reduction
XSCALE	data scaling
Arcimboldo	phasing

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2021-07-21 
Deposition Author(s): Zouhir, S., Contreras-Martel, C., Maragno Trindade, D., Attree, I., Dessen, A., Macheboeuf, P.

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Funding Organization	Location	Grant Number
Sao Paulo Research Foundation (FAPESP)	Brazil	2011/52067-6
Sao Paulo Research Foundation (FAPESP)	Brazil	2017/12436-9
French Infrastructure for Integrated Structural Biology (FRISBI)	France	ANR-10-INBS-0005-02

Revision History  

• Version 1.0: 2021-07-21
  Type: Initial release
  
• Version 1.1: 2021-08-18
  Changes: Database references