6FRW

X-ray structure of the levansucrase from Erwinia tasmaniensis

• PDB DOI:  https://doi.org/10.2210/pdb6FRW/pdb

• Classification: TRANSFERASE
• Organism(s): Erwinia tasmaniensis
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2018-02-16 Released: 2019-02-06 
• Deposition Author(s): Polsinelli, I., Salomone-Stagni, M., Caliandro, R., Demitri, N., Benini, S.
• Funding Organization(s): Free University of Bolzano

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.52 Å
• R-Value Free: 0.209 
• R-Value Work: 0.179 
• R-Value Observed: 0.181 

Literature

Comparison of the Levansucrase from the epiphyte Erwinia tasmaniensis vs its homologue from the phytopathogen Erwinia amylovora.

Polsinelli, I., Caliandro, R., Salomone-Stagni, M., Demitri, N., Rejzek, M., Field, R.A., Benini, S.

(2019) Int J Biol Macromol 127: 496-501

• PubMed: 30660564 
• DOI: https://doi.org/10.1016/j.ijbiomac.2019.01.074
• Primary Citation of Related Structures:  
  6FRW


• PubMed Abstract: 
  

Erwinia tasmaniensis is an epiphytic bacterium related to the plant pathogen Erwinia amylovora, the etiological agent of fire blight. In this study the levansucrase from E. tasmaniensis (EtLsc) has been compared with the homologous enzyme from E. amylovora (EaLsc). We characterized the enzymatic activity and compared the products profile of both enzymes by High Performance Anion Exchange Chromatography coupled with Pulsed Amperometric Detector (HPAEC-PAD). Moreover we determined the crystal structure of EtLsc to understand the structural peculiarity causing the different product profiles of the two homologues. EtLsc exhibits increased efficiency in the production of FOS, resulting in a better catalyst for biotechnological synthesis than EaLsc. Based on our results, we propose that the role of this enzyme in the life cycle of the two bacteria is most likely related to survival, rather than linked to pathogenicity in E. amylovora.

---

Organizational Affiliation: 

Bioorganic Chemistry and Bio-Crystallography laboratory (B(2)Cl), Faculty of Science and Technology, Free University of Bolzano, Piazza Università 5, 39100 Bolzano, Italy. Electronic address: [e-mail].

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: 46.83 kDa 
• Atom Count: 3,829 
• Modelled Residue Count: 411 
• Deposited Residue Count: 411 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Levansucrase (Beta-D-fructofuranosyl transferase)	A	411	Erwinia tasmaniensis	Mutation(s): 0  Gene Names: lsc, ETA_34670 EC: 2.4.1.10
UniProt
Find proteins for B2VCC3 (Erwinia tasmaniensis (strain DSM 17950 / CFBP 7177 / CIP 109463 / NCPPB 4357 / Et1/99)) Explore B2VCC3  Go to UniProtKB:  B2VCC3

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
GOL	B [auth A], C [auth A], D [auth A], E [auth A], F [auth A], G [auth A], H [auth A]	GLYCEROL C3 H8 O3 PEDCQBHIVMGVHV-UHFFFAOYSA-N
ZN	I [auth A], J [auth A], K [auth A]	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.52 Å
• R-Value Free: 0.209 
• R-Value Work: 0.179 
• R-Value Observed: 0.181 
• Space Group: P 4₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 128.493	α = 90
b = 128.493	β = 90
c = 58.945	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
REFMAC	refinement
PDB_EXTRACT	data extraction

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2019-02-06 
Deposition Author(s): Polsinelli, I., Salomone-Stagni, M., Caliandro, R., Demitri, N., Benini, S.

---

Funding Organization	Location	Grant Number
Free University of Bolzano	Italy	1440

Revision History  

• Version 1.0: 2019-02-06
  Type: Initial release