5EFD

Crystal structure of a surface pocket creating mutant (W6A) of an alkali thermostable GH10 xylanase from Bacillus sp. NG-27


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.67 Å
  • R-Value Free: 0.187 
  • R-Value Work: 0.158 
  • R-Value Observed: 0.159 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Small Glycols Discover Cryptic Pockets on Proteins for Fragment-Based Approaches.

Bansia, H.Mahanta, P.Yennawar, N.H.Ramakumar, S.

(2021) J Chem Inf Model 

  • DOI: https://doi.org/10.1021/acs.jcim.0c01126
  • Primary Citation of Related Structures:  
    5EFD, 5XC0, 5XC1

  • PubMed Abstract: 

    Cryptic pockets are visible in ligand-bound protein structures but are occluded in unbound structures. Utilizing these pockets in fragment-based drug-design provides an attractive option for proteins not tractable by classical binding sites. However, owing to their hidden nature, they are difficult to identify. Here, we show that small glycols find cryptic pockets on a diverse set of proteins. Initial crystallography experiments serendipitously revealed the ability of ethylene glycol, a small glycol, to identify a cryptic pocket on the W6A mutant of the RBSX protein (RBSX-W6A). Explicit-solvent molecular dynamics (MD) simulations of RBSX-W6A with the exposed state of the cryptic pocket (ethylene glycol removed) revealed closure of the pocket reiterating that the exposed state of cryptic pockets in general are unstable in the absence of ligands. Also, no change in the pocket was observed for simulations of RBSX-W6A with the occluded state of the cryptic pocket, suggesting that water molecules are not able to open the cryptic pocket. "Cryptic-pocket finding" potential of small glycols was then supported and generalized through additional crystallography experiments, explicit-cosolvent MD simulations, and protein data set construction and analysis. The cryptic pocket on RBSX-W6A was found again upon repeating the crystallography experiments with another small glycol, propylene glycol. Use of ethylene glycol as a probe molecule in cosolvent MD simulations led to the enhanced sampling of the exposed state of experimentally observed cryptic sites on a test set of two proteins (Niemann-Pick C2, Interleukin-2). Further, analyses of protein structures with validated cryptic sites showed that ethylene glycol molecules bind to sites on proteins (Bcl-xL, G-actin, myosin II, and glutamate receptor 2), which become apparent upon binding of biologically relevant ligands. Our study thus suggests potential application of the small glycols in experimental and computational fragment-based approaches to identify cryptic pockets in apparently undruggable and/or difficult targets, making these proteins amenable to drug-design strategies.


  • Organizational Affiliation

    Department of Physics, Indian Institute of Science, Bengaluru 560012, India.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Beta-xylanase
A, B
355Bacillus sp. NG-27Mutation(s): 1 
EC: 3.2.1.8
UniProt
Find proteins for O30700 (Bacillus sp. NG-27)
Explore O30700 
Go to UniProtKB:  O30700
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO30700
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
EDO
Query on EDO

Download Ideal Coordinates CCD File 
E [auth A]
F [auth A]
G [auth A]
K [auth B]
L [auth B]
E [auth A],
F [auth A],
G [auth A],
K [auth B],
L [auth B],
M [auth B],
N [auth B]
1,2-ETHANEDIOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
CL
Query on CL

Download Ideal Coordinates CCD File 
H [auth A]CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
MG
Query on MG

Download Ideal Coordinates CCD File 
C [auth A],
I [auth B]
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
NA
Query on NA

Download Ideal Coordinates CCD File 
D [auth A],
J [auth B]
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.67 Å
  • R-Value Free: 0.187 
  • R-Value Work: 0.158 
  • R-Value Observed: 0.159 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 54.99α = 90
b = 76.6β = 90
c = 176.49γ = 90
Software Package:
Software NamePurpose
SCALAdata scaling
REFMACrefinement
PDB_EXTRACTdata extraction
SCALAdata reduction
PHASERphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-10-26
    Type: Initial release
  • Version 1.1: 2021-03-24
    Changes: Database references, Derived calculations
  • Version 1.2: 2024-03-20
    Changes: Data collection, Database references