Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report | Ligand Interaction

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

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

Macromolecule Content

• Total Structure Weight: 14.64 kDa 
• Atom Count: 972 
• Modelled Residue Count: 109 
• Deposited Residue Count: 126 
• Unique protein chains: 1

4DNY

Crystal structure of enterohemorrhagic E. coli StcE(132-251)

• PDB DOI: 10.2210/pdb4DNY/pdb

• Classification: HYDROLASE
• Organism(s): Escherichia coli O157:H7
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2012-02-09 Released: 2012-05-16 
• Deposition Author(s): Yu, A.C.Y., Strynadka, N.C.J.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.61 Å
• R-Value Free: 0.213 
• R-Value Work: 0.182 
• R-Value Observed: 0.184 

Literature

Structural Insight into the Bacterial Mucinase StcE Essential to Adhesion and Immune Evasion during Enterohemorrhagic E. coli Infection.

Yu, A.C., Worrall, L.J., Strynadka, N.C.

(2012) Structure 20: 707-717

• PubMed: 22483117 
• DOI: 10.1016/j.str.2012.02.015
• Primary Citation of Related Structures:  
  3UJZ, 4DNY


• PubMed Abstract: 
  

Mucin glycoproteins with large numbers of O-linked glycosylations comprise the mucosal barrier lining the mammalian gastrointestinal tract from mouth to gut. A critical biological function of mucins is to protect the underlying epithelium from infection. Enterohemorrhagic Escherichia coli (EHEC), the mediator of severe food- and water-borne disease, can breach this barrier and adhere to intestinal cells. StcE, a ∼100 kDa metalloprotease secreted by EHEC, plays a pivotal role in remodeling the mucosal lining during infection. To obtain mechanistic insight into its function, we have determined the structure of StcE. Our data reveal a dynamic, multidomain architecture featuring an unusually large substrate-binding cleft and a prominent polarized surface charge distribution highly suggestive of an electrostatic role in substrate targeting. The observation of key conserved motifs in the active site allows us to propose the structural basis for the specific recognition of α-O-glycan-containing substrates. Complementary biochemical analysis provides further insight into its distinct substrate specificity and binding stoichiometry.

---

Organizational Affiliation: 

Department of Biochemistry and Molecular Biology and the Center for Blood Research, Life Sciences Center, 2350 Health Sciences Mall, University of British Columbia, Vancouver, BC V6T 1Z3, Canada.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Metalloprotease stcE	A	126	Escherichia coli O157:H7	Mutation(s): 0  Gene Names: stcE, tagA, L7031, ECO57PM83 EC: 3.4.24
UniProt
Find proteins for O82882 (Escherichia coli O157:H7) Explore O82882  Go to UniProtKB:  O82882

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
IOD	B [auth A], C [auth A], D [auth A], E [auth A], F [auth A], G [auth A], H [auth A]	IODIDE ION I XMBWDFGMSWQBCA-UHFFFAOYSA-M

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.61 Å
• R-Value Free: 0.213 
• R-Value Work: 0.182 
• R-Value Observed: 0.184 
• Space Group: H 3

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 56	α = 90
b = 56	β = 90
c = 96.88	γ = 120

Software Package:

Software Name	Purpose
MAR345dtb	data collection
SHARP	phasing
REFMAC	refinement
MOSFLM	data reduction
SCALA	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2012-02-09 
• Released Date: 2012-05-16 
Deposition Author(s): Yu, A.C.Y., Strynadka, N.C.J.

Revision History  

• Version 1.0: 2012-05-16
  Type: Initial release