4XHX

Crystal structure of the NanB sialidase from streptococcus pneumoniae in complex with Optactin and 2-[(3-Chlorobenzyl)ammonio]ethanesulfonate

• PDB DOI: https://doi.org/10.2210/pdb4XHX/pdb

• Classification: HYDROLASE
• Organism(s): Streptococcus pneumoniae TIGR4
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): Yes 


• Deposited: 2015-01-06 Released: 2016-01-20 
• Deposition Author(s): Brear, P.
• Funding Organization(s): Biotechnology and Biological Sciences Research Council, SULSA

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.10 Å
• R-Value Free: 0.221 
• R-Value Work: 0.170 
• R-Value Observed: 0.172 

Starting Model: experimental

Literature

The Hunt for Serendipitous Allosteric Sites: Discovery of a novel allosteric inhibitor of the bacterial sialidase NanB

Rogers, G.W., Brear, P., Yang, L., Chen, A.S., Mitchell, J.B.O., Taylor, G.L., Westwood, N.J.

To be published.

Biological Assembly 1  

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

Biological assembly 1 generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 74.3 kDa 
• Atom Count: 5,933 
• Modelled Residue Count: 658 
• Deposited Residue Count: 658 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Sialidase B	A	658	Streptococcus pneumoniae TIGR4	Mutation(s): 1  Gene Names: nanB, SP_1687 EC: 3.2.1.18
UniProt
Find proteins for Q54727 (Streptococcus pneumoniae serotype 4 (strain ATCC BAA-334 / TIGR4)) Explore Q54727  Go to UniProtKB:  Q54727

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
OPX	C [auth A]	(1s,3R,4S)-1-[(cyclohexylamino)methyl]-3,4-dihydroxycyclopentanesulfonic acid C12 H23 N O5 S RMLVAYWMDDDXFB-ZSBIGDGJSA-N
JKK	B [auth A]	2-[(3-chlorobenzyl)amino]ethanesulfonic acid C9 H12 Cl N O3 S YIFAENIIGITJQU-UHFFFAOYSA-N
DMS	D [auth A], E [auth A], F [auth A]	DIMETHYL SULFOXIDE C2 H6 O S IAZDPXIOMUYVGZ-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.10 Å
• R-Value Free: 0.221 
• R-Value Work: 0.170 
• R-Value Observed: 0.172 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 76.469	α = 90
b = 82.709	β = 90
c = 117.032	γ = 90

Software Package:

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

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2016-01-20 
Deposition Author(s): Brear, P.

---

Funding Organization	Location	Grant Number
Biotechnology and Biological Sciences Research Council	United Kingdom	--
SULSA	United Kingdom	--

Revision History  

• Version 1.0: 2016-01-20
  Type: Initial release
  
• Version 2.0: 2017-08-30
  Changes: Advisory, Atomic model, Author supporting evidence, Data collection, Derived calculations
• Version 2.1: 2024-01-10
  Changes: Data collection, Database references, Refinement description