8U45

Crystal Structure Analysis of Aspergillus fumigatus alkaline protease


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.193 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.0 of the entry. See complete history


Literature

Targeting Aspergillus allergen oryzin with a chemical probe at atomic precision.

Pattelli, O.N.Diec, D.D.L.Guo, W.Russi, S.Fernandez, D.

(2023) Sci Rep 13: 17926-17926

  • DOI: https://doi.org/10.1038/s41598-023-45028-z
  • Primary Citation of Related Structures:  
    8GKO, 8GKP, 8GKQ, 8U45

  • PubMed Abstract: 

    We report the molecular basis of Aspergillus fumigatus oryzin, allergen Asp f 13, or alkaline proteinase ALP1, containing the sequence motif His-Asp-Ser of the subtilisin family, structure, and function at atomic detail. Given the resolution of the data (1.06 Å), we use fragment molecular replacement with ideal polyalanine α-helices to determine the first crystal structure of oryzin. We probe the catalytic serine through formation of an irreversible bond to a small molecule compound, specifically labeling it, describing the amino acid residues performing the catalytic function. Defined by a self-processed pro-peptide, the active site architecture shapes up pocket-like subsites that bind to and unveil the S1'-S4' substrate binding preferences. We use molecular modeling to dock a model of the pro-peptide in the S1-S4 region and to dock collagen along the active site cleft. Opposite to the face harboring the catalytic serine, the enzyme binds to a calcium ion in a binding site created by backbone flipping. We use thermal unfolding to show that this metal ion provides structural stability. With no known host inhibitor identified thus far, this structure may hasten the progress of developing new therapeutic agents for diseases caused by pathogenic fungi.


  • Organizational Affiliation

    Sarafan ChEM-H, Stanford University, Stanford, CA, 94305, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Alkaline protease 1101Aspergillus fumigatus Af293Mutation(s): 0 
Gene Names: alp1alk1alpAFUA_4G11800
EC: 3.4.21.63
UniProt
Find proteins for P28296 (Aspergillus fumigatus (strain ATCC MYA-4609 / CBS 101355 / FGSC A1100 / Af293))
Explore P28296 
Go to UniProtKB:  P28296
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP28296
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Alkaline protease 1B [auth C]282Aspergillus fumigatus Af293Mutation(s): 0 
Gene Names: alp1alk1alpAFUA_4G11800
EC: 3.4.21.63
UniProt
Find proteins for P28296 (Aspergillus fumigatus (strain ATCC MYA-4609 / CBS 101355 / FGSC A1100 / Af293))
Explore P28296 
Go to UniProtKB:  P28296
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP28296
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
PEG
Query on PEG

Download Ideal Coordinates CCD File 
C [auth A]
D [auth A]
G [auth C]
H [auth C]
I [auth C]
C [auth A],
D [auth A],
G [auth C],
H [auth C],
I [auth C],
J [auth C]
DI(HYDROXYETHYL)ETHER
C4 H10 O3
MTHSVFCYNBDYFN-UHFFFAOYSA-N
CA (Subject of Investigation/LOI)
Query on CA

Download Ideal Coordinates CCD File 
E [auth C]CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
CL
Query on CL

Download Ideal Coordinates CCD File 
F [auth C]CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.193 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 42.91α = 90
b = 94.592β = 103.2
c = 52.925γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
SCALAdata scaling
XDSdata reduction
PHASERphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Not funded--

Revision History  (Full details and data files)

  • Version 1.0: 2023-11-01
    Type: Initial release