5AB0

Crystal structure of aminopeptidase ERAP2 with ligand


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.201 

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This is version 2.0 of the entry. See complete history


Literature

Structural Basis for Antigenic Peptide Recognition and Processing by Endoplasmic Reticulum (Er) Aminopeptidase 2.

Mpakali, A.Giastas, P.Mathioudakis, N.Mavridis, I.M.Saridakis, E.Stratikos, E.

(2015) J Biol Chem 290: 26021

  • DOI: 10.1074/jbc.M115.685909
  • Primary Citation of Related Structures:  
    5AB0, 5AB2, 5CU5

  • PubMed Abstract: 
  • Endoplasmic reticulum (ER) aminopeptidases process antigenic peptide precursors to generate epitopes for presentation by MHC class I molecules and help shape the antigenic peptide repertoire and cytotoxic T-cell responses. To perform this function, ER aminopeptidases have to recognize and process a vast variety of peptide sequences ...

    Endoplasmic reticulum (ER) aminopeptidases process antigenic peptide precursors to generate epitopes for presentation by MHC class I molecules and help shape the antigenic peptide repertoire and cytotoxic T-cell responses. To perform this function, ER aminopeptidases have to recognize and process a vast variety of peptide sequences. To understand how these enzymes recognize substrates, we determined crystal structures of ER aminopeptidase 2 (ERAP2) in complex with a substrate analogue and a peptidic product to 2.5 and 2.7 Å, respectively, and compared them to the apo-form structure determined to 3.0 Å. The peptides were found within the internal cavity of the enzyme with no direct access to the outside solvent. The substrate analogue extends away from the catalytic center toward the distal end of the internal cavity, making interactions with several shallow pockets along the path. A similar configuration was evident for the peptidic product, although decreasing electron density toward its C terminus indicated progressive disorder. Enzymatic analysis confirmed that visualized interactions can either positively or negatively impact in vitro trimming rates. Opportunistic side-chain interactions and lack of deep specificity pockets support a limited-selectivity model for antigenic peptide processing by ERAP2. In contrast to proposed models for the homologous ERAP1, no specific recognition of the peptide C terminus by ERAP2 was evident, consistent with functional differences in length selection and self-activation between these two enzymes. Our results suggest that ERAP2 selects substrates by sequestering them in its internal cavity and allowing opportunistic interactions to determine trimming rates, thus combining substrate permissiveness with sequence bias.


    Organizational Affiliation

    From the National Center for Scientific Research Demokritos, Agia Paraskevi, Athens 15310, Greece stratos@rrp.demokritos.gr stratikos@gmail.com.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ENDOPLASMATIC RETICULUM AMINOPEPTIDASE 2A, B [auth C]967Homo sapiensMutation(s): 1 
Gene Names: ERAP2LRAP
EC: 3.4.11.1 (PDB Primary Data), 3.4.11.6 (PDB Primary Data), 3.4.11 (UniProt)
UniProt & NIH Common Fund Data Resources
Find proteins for Q6P179 (Homo sapiens)
Explore Q6P179 
Go to UniProtKB:  Q6P179
PHAROS:  Q6P179
Protein Feature View
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  • Reference Sequence
  • Find similar proteins by:  Sequence   |   Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
DG025C [auth E], D [auth F]10synthetic constructMutation(s): 0 
Protein Feature View
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  • Reference Sequence
Oligosaccharides

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Entity ID: 3
MoleculeChainsChain Length2D DiagramGlycosylation3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranoseE [auth B], H, J2N-Glycosylation Oligosaccharides Interaction
Glycosylation Resources
GlyTouCan:  G42666HT
GlyCosmos:  G42666HT
GlyGen:  G42666HT
Entity ID: 4
MoleculeChainsChain Length2D DiagramGlycosylation3D Interactions
beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranoseF [auth D], G3N-Glycosylation Oligosaccharides Interaction
Glycosylation Resources
GlyTouCan:  G15407YE
GlyCosmos:  G15407YE
GlyGen:  G15407YE
Entity ID: 5
MoleculeChainsChain Length2D DiagramGlycosylation3D Interactions
beta-D-mannopyranose-(1-4)-[beta-D-mannopyranose-(1-6)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranoseI5N-Glycosylation Oligosaccharides Interaction
Glycosylation Resources
GlyTouCan:  G93777VW
GlyCosmos:  G93777VW
GlyGen:  G93777VW
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAG (Subject of Investigation/LOI)
Query on NAG

Download Ideal Coordinates CCD File 
L [auth A] , M [auth A] , N [auth A] , O [auth A] , S [auth C] , T [auth C] , U [auth C] , V [auth C] , 
L [auth A],  M [auth A],  N [auth A],  O [auth A],  S [auth C],  T [auth C],  U [auth C],  V [auth C],  W [auth C],  X [auth C]
2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
MES
Query on MES

Download Ideal Coordinates CCD File 
R [auth A]2-(N-MORPHOLINO)-ETHANESULFONIC ACID
C6 H13 N O4 S
SXGZJKUKBWWHRA-UHFFFAOYSA-N
 Ligand Interaction
ZN
Query on ZN

Download Ideal Coordinates CCD File 
K [auth A], Y [auth C]ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
EDO
Query on EDO

Download Ideal Coordinates CCD File 
AA [auth C], P [auth A], Q [auth A], Z [auth C]1,2-ETHANEDIOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
LYN
Query on LYN
C [auth E], D [auth F]L-PEPTIDE LINKINGC6 H16 N3 OLYS
Binding Affinity Annotations 
IDSourceBinding Affinity
2X0 BindingDB:  5AB0 Ki: min: 4.70e+4, max: 2.50e+5 (nM) from 2 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.201 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 75.35α = 90
b = 134.42β = 90.49
c = 129γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XDSdata scaling
MOLREPphasing

Structure Validation

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Ligand Structure Quality Assessment  



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-09-30
    Type: Initial release
  • Version 1.1: 2015-11-11
    Changes: Database references
  • Version 1.2: 2019-04-03
    Changes: Data collection, Derived calculations, Other, Source and taxonomy
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Atomic model, Data collection, Derived calculations, Other, Structure summary