Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Dihedral - D2  (3D View)
Global Stoichiometry: Homo 4-mer - A4 

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

Macromolecule Content

• Total Structure Weight: 28.55 kDa 
• Atom Count: 1850 
• Residue Count: 213 
• Unique protein chains: 1

4P1M

The structure of Escherichia coli ZapA

• DOI: 10.2210/pdb4P1M/pdb

• Classification: CELL CYCLE
• Organism(s): Escherichia coli
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2014-02-26 Released: 2014-07-16 
• Deposition Author(s): Kimber, M.S., Roach, E.J., Khursigara, C.M.
• Funding Organization(s): Natural Sciences and Engineering Research Council (NSERC, Canada)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.95 Å
• R-Value Free: 0.270 
• R-Value Work: 0.224 
• R-Value Observed: 0.226 

Literature

Crystal Structure and Site-directed Mutational Analysis Reveals Key Residues Involved in Escherichia coli ZapA Function.

Roach, E.J., Kimber, M.S., Khursigara, C.M.

(2014) J Biol Chem 289: 23276-23286

• PubMed: 25002581 
• DOI: 10.1074/jbc.M114.561928
• Structures With Same Primary Citation


• PubMed Abstract: 
  

FtsZ is an essential cell division protein in Escherichia coli, and its localization, filamentation, and bundling at the mid-cell are required for Z-ring stability. Once assembled, the Z-ring recruits a series of proteins that comprise the bacterial divisome. Zaps (FtsZ-associated proteins) stabilize the Z-ring by increasing lateral interactions between individual filaments, bundling FtsZ to provide a scaffold for divisome assembly. The x-ray crystallographic structure of E. coli ZapA was determined, identifying key structural differences from the existing ZapA structure from Pseudomonas aeruginosa, including a charged α-helix on the globular domains of the ZapA tetramer. Key helix residues in E. coli ZapA were modified using site-directed mutagenesis. These ZapA variants significantly decreased FtsZ bundling in protein sedimentation assays when compared with WT ZapA proteins. Electron micrographs of ZapA-bundled FtsZ filaments showed the modified ZapA variants altered the number of FtsZ filaments per bundle. These in vitro results were corroborated in vivo by expressing the ZapA variants in an E. coli ΔzapA strain. In vivo, ZapA variants that altered FtsZ bundling showed an elongated phenotype, indicating improper cell division. Our findings highlight the importance of key ZapA residues that influence the extent of FtsZ bundling and that ultimately affect Z-ring formation in dividing cells.

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Organizational Affiliation: 

From the Department of Molecular and Cellular Biology, University of Guelph, Guelph, Ontario N1G 2W1, Canada [e-mail].

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Cell division protein ZapA	A, B	123	Escherichia coli	Mutation(s): 0  Gene Names: zapA
Find proteins for P0ADS2 (Escherichia coli (strain K12)) Go to UniProtKB:  P0ADS2

Small Molecules

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

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.95 Å
• R-Value Free: 0.270 
• R-Value Work: 0.224 
• R-Value Observed: 0.226 
• Space Group: P 6₁ 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 54.1	α = 90
b = 54.1	β = 90
c = 328.07	γ = 120

Software Package:

Software Name	Purpose
PHENIX	refinement

Structure Validation

Entry History & Funding Information

Deposition Data

• Deposited Date: 2014-02-26 
• Released Date: 2014-07-16 
Deposition Author(s): Kimber, M.S., Roach, E.J., Khursigara, C.M.

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Funding Organization	Location	Grant Number
Natural Sciences and Engineering Research Council (NSERC, Canada)	Canada	327280
Natural Sciences and Engineering Research Council (NSERC, Canada)	Canada	371639

Revision History 

• Version 1.0: 2014-07-16
  Type: Initial release
  
• Version 1.1: 2014-10-01
  Changes: Database references
• Version 1.2: 2017-09-20
  Changes: Advisory, Author supporting evidence, Database references, Derived calculations, Other, Source and taxonomy
• Version 1.3: 2020-01-08
  Changes: Author supporting evidence