4RE6

Acylaminoacyl peptidase complexed with a chloromethylketone inhibitor

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.55 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.212 
  • R-Value Observed: 0.214 

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Literature

Catalytically distinct states captured in a crystal lattice: the substrate-bound and scavenger states of acylaminoacyl peptidase and their implications for functionality.

Menyhard, D.K., Orgovan, Z., Szeltner, Z., Szamosi, I., Harmat, V.

(2015) Acta Crystallogr D Biol Crystallogr 71: 461-472

  • DOI: 10.1107/S1399004714026819
  • Primary Citation of Related Structures:  
    4RE5, 4RE6

  • PubMed Abstract: 

    • Acylaminoacyl peptidase (AAP) is an oligopeptidase that only cleaves short peptides or protein segments. In the case of AAP from Aeropyrum pernix (ApAAP), previous studies have led to a model in which the clamshell-like opening and closing of the enzyme provides the means of substrate-size selection ...

    Acylaminoacyl peptidase (AAP) is an oligopeptidase that only cleaves short peptides or protein segments. In the case of AAP from Aeropyrum pernix (ApAAP), previous studies have led to a model in which the clamshell-like opening and closing of the enzyme provides the means of substrate-size selection. The closed form of the enzyme is catalytically active, while opening deactivates the catalytic triad. The crystallographic results presented here show that the open form of ApAAP is indeed functionally disabled. The obtained crystal structures also reveal that the closed form is penetrable to small ligands: inhibitor added to the pre-formed crystal was able to reach the active site of the rigidified protein, which is only possible through the narrow channel of the propeller domain. Molecular-dynamics simulations investigating the structure of the complexes formed with longer peptide substrates showed that their binding within the large crevice of the closed form of ApAAP leaves the enzyme structure unperturbed; however, their accessing the binding site seems more probable when assisted by opening of the enzyme. Thus, the open form of ApAAP corresponds to a scavenger of possible substrates, the actual cleavage of which only takes place if the enzyme is able to re-close.

    Organizational Affiliation: 

    MTA-ELTE Protein Modelling Research Group, Pázmány Péter sétány 1/A, 1117 Budapest, Hungary.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Acylamino-acid-releasing enzymeA, B, C, D582Aeropyrum pernix K1Mutation(s): 0 
Gene Names: APE_1547.1
EC: 3.4.19.1
UniProt
Find proteins for Q9YBQ2 (Aeropyrum pernix (strain ATCC 700893 / DSM 11879 / JCM 9820 / NBRC 100138 / K1))
Explore Q9YBQ2 
Go to UniProtKB:  Q9YBQ2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9YBQ2
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
Y3A
Query on Y3A
Download Ideal Coordinates CCD File 
E [auth A],
J [auth C]		N-[(benzyloxy)carbonyl]glycyl-N-[(2S,3R)-4-chloro-3-hydroxy-1-phenylbutan-2-yl]glycinamide
C22 H26 Cl N3 O5
WLEADEPGUSFGIL-OALUTQOASA-N		 Ligand Interaction
CL
Query on CL
Download Ideal Coordinates CCD File 
F [auth A],
G [auth A],
H [auth B],
I [auth B],
K [auth C],
F [auth A],
G [auth A],
H [auth B],
I [auth B],
K [auth C],
L [auth C]
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M		 Ligand Interaction
Biologically Interesting Molecules (External Reference) 1 Unique
Entity ID: 2
IDChainsNameType/Class2D Diagram3D Interactions
PRD_001053 (Y3A)
Query on PRD_001053		E [auth A],
J [auth C]		Z-GLY-GLY-PHE-CHLOROMETHYL KETONE (BOUND FORM)Peptide-like / Enzyme inhibitor Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.55 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.212 
  • R-Value Observed: 0.214 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 71.58α = 105.15
b = 97.3β = 103.96
c = 99.16γ = 100.26
Software Package:
Software NamePurpose
MxCuBEdata collection
MOLREPphasing
REFMACrefinement
XDSdata reduction
XSCALEdata scaling

Structure Validation

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Ligand Structure Quality Assessment 


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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-01-28
    Type: Initial release
  • Version 1.1: 2015-03-18
    Changes: Database references
  • Version 1.2: 2020-10-21
    Changes: Data collection, Derived calculations