9FZ3 | pdb_00009fz3

Crystal structure of K38 amylase from Bacillus sp. strain KSM-K38 covalently bound to alpha-1,6 branched pseudo-trisaccharide activity-based probe


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.02 Å
  • R-Value Free: 
    0.242 (Depositor), 0.251 (DCC) 
  • R-Value Work: 
    0.201 (Depositor), 0.210 (DCC) 
  • R-Value Observed: 
    0.203 (Depositor) 

Starting Model: experimental
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Ligand Structure Quality Assessment 

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Literature

Precision Activity-Based alpha-Amylase Probes for Dissection and Annotation of Linear and Branched-Chain Starch-Degrading Enzymes.

Pickles, I.B.Chen, Y.Moroz, O.Brown, H.A.de Boer, C.Armstrong, Z.McGregor, N.G.S.Artola, M.Codee, J.D.C.Koropatkin, N.M.Overkleeft, H.S.Davies, G.J.

(2025) Angew Chem Int Ed Engl 64: e202415219-e202415219

  • DOI: https://doi.org/10.1002/anie.202415219
  • Primary Citation of Related Structures:  
    9FYZ, 9FZ0, 9FZ2, 9FZ3

  • PubMed Abstract: 

    α-Amylases are the workhorse enzymes of starch degradation. They are central to human health, including as targets for anti-diabetic compounds, but are also the key enzymes in the industrial processing of starch for biofuels, corn syrups, brewing and detergents. Dissection of the activity, specificity and stability of α-amylases is crucial to understanding their biology and allowing their exploitation. Yet, functional characterization lags behind DNA sequencing and genomics; and new tools are required for rapid analysis of α-amylase function. Here, we design, synthesize and apply new branched α-amylase activity-based probes. Using both α-1,6 branched and unbranched α-1,4 maltobiose activity-based probes we were able to explore the stability and substrate specificity of both a panel of human gut microbial α-amylases and a panel of industrially relevant α-amylases. We also demonstrate how we can detect and annotate the substrate specificity of α-amylases in the complex cell lysate of both a prominent gut microbe and a diverse compost sample by in-gel fluorescence and mass spectrometry. A toolbox of starch-active activity-based probes will enable rapid functional dissection of α-amylases. We envisage activity-based probes contributing to better selection and engineering of enzymes for industrial application as well as fundamental analysis of enzymes in human health.


  • Organizational Affiliation

    University of York, York Structural Biology Laboratory, Department of Chemistry, UNITED KINGDOM OF GREAT BRITAIN AND NORTHERN IRELAND.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Amylase502Bacillus sp. KSM-K38Mutation(s): 0 
Gene Names: amyK38
UniProt
Find proteins for Q93I48 (Bacillus sp. KSM-K38)
Explore Q93I48 
Go to UniProtKB:  Q93I48
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ93I48
Sequence Annotations
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  • Reference Sequence
Oligosaccharides

Help

Entity ID: 2
MoleculeChains Length2D Diagram Glycosylation3D Interactions
alpha-D-glucopyranose-(1-6)-alpha-D-glucopyranose
B
2N/A
Glycosylation Resources
GlyTouCan:  G69864PN
GlyCosmos:  G69864PN
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
PBW (Subject of Investigation/LOI)
Query on PBW

Download Ideal Coordinates CCD File 
C [auth A](1~{S},4~{S},5~{R})-6-(hydroxymethyl)cyclohexane-1,2,3,4,5-pentol
C7 H14 O6
QFYQIWDMMSKNFF-VQPJZGIOSA-N
OC9 (Subject of Investigation/LOI)
Query on OC9

Download Ideal Coordinates CCD File 
D [auth A]OCTAN-1-OL
C8 H18 O
KBPLFHHGFOOTCA-UHFFFAOYSA-N
ACT
Query on ACT

Download Ideal Coordinates CCD File 
E [auth A]ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
NA
Query on NA

Download Ideal Coordinates CCD File 
F [auth A],
G [auth A],
H [auth A]
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.02 Å
  • R-Value Free:  0.242 (Depositor), 0.251 (DCC) 
  • R-Value Work:  0.201 (Depositor), 0.210 (DCC) 
  • R-Value Observed: 0.203 (Depositor) 
Space Group: P 2 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 132.486α = 90
b = 132.486β = 90
c = 132.486γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
DIALSdata reduction
Aimlessdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 

Created with Raphaël 2.3.0Worse 01 BetterLigand structure goodness of fit to experimental dataBest fitted PBWClick on this verticalbar to view details

Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
European Research Council (ERC)European Union951231

Revision History  (Full details and data files)

  • Version 1.0: 2024-12-11
    Type: Initial release
  • Version 1.1: 2025-02-05
    Changes: Database references