5LDS

Structure of the porcine aminopeptidase N ectodomain


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.206 
  • R-Value Work: 0.169 
  • R-Value Observed: 0.171 

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Ligand Structure Quality Assessment 


This is version 2.0 of the entry. See complete history


Literature

Allosteric inhibition of aminopeptidase N functions related to tumor growth and virus infection.

Santiago, C.Mudgal, G.Reguera, J.Recacha, R.Albrecht, S.Enjuanes, L.Casasnovas, J.M.

(2017) Sci Rep 7: 46045-46045

  • DOI: 10.1038/srep46045
  • Primary Citation of Related Structures:  
    5LG6, 5LHD, 5LDS

  • PubMed Abstract: 
  • Cell surface aminopeptidase N (APN) is a membrane-bound ectoenzyme that hydrolyzes proteins and peptides and regulates numerous cell functions. APN participates in tumor cell expansion and motility, and is a target for cancer therapies. Small drugs that bind to the APN active site inhibit catalysis and suppress tumor growth ...

    Cell surface aminopeptidase N (APN) is a membrane-bound ectoenzyme that hydrolyzes proteins and peptides and regulates numerous cell functions. APN participates in tumor cell expansion and motility, and is a target for cancer therapies. Small drugs that bind to the APN active site inhibit catalysis and suppress tumor growth. APN is also a major cell entry receptor for coronavirus, which binds to a region distant from the active site. Three crystal structures that we determined of human and pig APN ectodomains defined the dynamic conformation of the protein. These structures offered snapshots of closed, intermediate and open APN, which represent distinct functional states. Coronavirus envelope proteins specifically recognized the open APN form, prevented ectodomain progression to the closed form and substrate hydrolysis. In addition, drugs that bind the active site inhibited both coronavirus binding to cell surface APN and infection; the drugs probably hindered APN transition to the virus-specific open form. We conclude that allosteric inhibition of APN functions occurs by ligand suppression of ectodomain motions necessary for catalysis and virus cell entry, as validated by locking APN with disulfides. Blocking APN dynamics can thus be a valuable approach to development of drugs that target this ectoenzyme.


    Organizational Affiliation

    Centro Nacional de Biotecnología (CNB-CSIC), Darwin 3, Campus Universidad Autónoma de Madrid, 28049 Madrid, Spain.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Aminopeptidase NA, B, C, D945Sus scrofaMutation(s): 0 
Gene Names: ANPEP
EC: 3.4.11.2
UniProt
Find proteins for P15145 (Sus scrofa)
Explore P15145 
Go to UniProtKB:  P15145
Protein Feature View
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  • Reference Sequence
Oligosaccharides

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Entity ID: 2
MoleculeChainsChain Length2D DiagramGlycosylation3D Interactions
beta-D-mannopyranose-(1-3)-beta-D-mannopyranose-(1-6)-[beta-D-mannopyranose-(1-3)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranoseE6N-Glycosylation Oligosaccharides Interaction
Glycosylation Resources
GlyTouCan:  G67849DJ
GlyCosmos:  G67849DJ
GlyGen:  G67849DJ
Entity ID: 3
MoleculeChainsChain Length2D DiagramGlycosylation3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
F, G, H, I, J, K, L, M
F, G, H, I, J, K, L, M, N, P, Q, R, S
2N-Glycosylation Oligosaccharides Interaction
Glycosylation Resources
GlyTouCan:  G42666HT
GlyCosmos:  G42666HT
GlyGen:  G42666HT
Entity ID: 4
MoleculeChainsChain Length2D DiagramGlycosylation3D Interactions
beta-D-mannopyranose-(1-3)-beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranoseO4N-Glycosylation Oligosaccharides Interaction
Glycosylation Resources
GlyTouCan:  G31886NL
GlyCosmos:  G31886NL
GlyGen:  G31886NL
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAG (Subject of Investigation/LOI)
Query on NAG

Download Ideal Coordinates CCD File 
AA [auth B] , BA [auth B] , CA [auth B] , FA [auth C] , GA [auth C] , HA [auth C] , IA [auth C] , JA [auth C] , 
AA [auth B],  BA [auth B],  CA [auth B],  FA [auth C],  GA [auth C],  HA [auth C],  IA [auth C],  JA [auth C],  MA [auth D],  NA [auth D],  OA [auth D],  PA [auth D],  U [auth A],  V [auth A],  W [auth A],  Z [auth B]
2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
ZN
Query on ZN

Download Ideal Coordinates CCD File 
EA [auth C], LA [auth D], T [auth A], Y [auth B]ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
ACT
Query on ACT

Download Ideal Coordinates CCD File 
DA [auth B], KA [auth C], QA [auth D], X [auth A]ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.206 
  • R-Value Work: 0.169 
  • R-Value Observed: 0.171 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 78.67α = 99.66
b = 78.77β = 92.62
c = 223.87γ = 111.33
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment  



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Spanish Ministry of ScienceSpainBFU2011-23940, BIO2014-52683-R

Revision History  (Full details and data files)

  • Version 1.0: 2017-04-05
    Type: Initial release
  • Version 1.1: 2017-04-19
    Changes: Database references
  • Version 1.2: 2018-06-13
    Changes: Data collection
  • Version 1.3: 2019-10-16
    Changes: Data collection
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Atomic model, Data collection, Derived calculations, Source and taxonomy, Structure summary