6AZT

Asparaginyl endopeptidase 1 bound to AAN peptide, a tetrahedral intermediate


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.189 
  • R-Value Work: 0.152 
  • R-Value Observed: 0.154 

wwPDB Validation   3D Report Full Report


This is version 2.1 of the entry. See complete history


Literature

Structural basis of ribosomal peptide macrocyclization in plants.

Haywood, J.Schmidberger, J.W.James, A.M.Nonis, S.G.Sukhoverkov, K.V.Elias, M.Bond, C.S.Mylne, J.S.

(2018) Elife 7

  • DOI: 10.7554/eLife.32955
  • Primary Citation of Related Structures:  
    6AZT

  • PubMed Abstract: 
  • Constrained, cyclic peptides encoded by plant genes represent a new generation of drug leads. Evolution has repeatedly recruited the Cys-protease asparaginyl endopeptidase (AEP) to perform their head-to-tail ligation. These macrocyclization reactions use the substrates amino terminus instead of water to deacylate, so a peptide bond is formed ...

    Constrained, cyclic peptides encoded by plant genes represent a new generation of drug leads. Evolution has repeatedly recruited the Cys-protease asparaginyl endopeptidase (AEP) to perform their head-to-tail ligation. These macrocyclization reactions use the substrates amino terminus instead of water to deacylate, so a peptide bond is formed. How solvent-exposed plant AEPs macrocyclize is poorly understood. Here we present the crystal structure of an active plant AEP from the common sunflower, Helianthus annuus . The active site contained electron density for a tetrahedral intermediate with partial occupancy that predicted a binding mode for peptide macrocyclization. By substituting catalytic residues we could alter the ratio of cyclic to acyclic products. Moreover, we showed AEPs from other species lacking cyclic peptides can perform macrocyclization under favorable pH conditions. This structural characterization of AEP presents a logical framework for engineering superior enzymes that generate macrocyclic peptide drug leads.


    Organizational Affiliation

    The ARC Centre of Excellence in Plant Energy Biology, University of Western Australia, Crawley, Australia.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Asparaginyl endopeptidase 1A491Helianthus annuusMutation(s): 0 
Gene Names: AEP1VPEHannXRQ_Chr17g0548711
Find proteins for A0A251RPF5 (Helianthus annuus)
Explore A0A251RPF5 
Go to UniProtKB:  A0A251RPF5
Protein Feature View
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  • Reference Sequence
  • Find similar proteins by:  Sequence   |   Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
ALA-ALA-ASN tetrahedral intermediateB3synthetic constructMutation(s): 0 
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GOL
Query on GOL

Download Ideal Coordinates CCD File 
C [auth A], D [auth A], E [auth A]GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  2 Unique
IDChainsTypeFormula2D DiagramParent
SNN
Query on SNN
AL-PEPTIDE LINKINGC4 H6 N2 O2ASN
CE7
Query on CE7
BL-PEPTIDE LINKINGC4 H10 N2 O4ASN
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.189 
  • R-Value Work: 0.152 
  • R-Value Observed: 0.154 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 77.03α = 90
b = 77.03β = 90
c = 108.171γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
iMOSFLMdata reduction
Aimlessdata scaling
PHASERphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data

  • Deposited Date: 2017-09-13 
  • Released Date: 2018-02-07 
  • Deposition Author(s): Bond, C.S.

Funding OrganizationLocationGrant Number
Australian Research Council (ARC)AustraliaDP160100107

Revision History  (Full details and data files)

  • Version 1.0: 2018-02-07
    Type: Initial release
  • Version 2.0: 2018-05-16
    Changes: Atomic model, Data collection, Database references, Derived calculations, Non-polymer description, Polymer sequence, Structure summary
  • Version 2.1: 2020-01-01
    Changes: Author supporting evidence