Crystal structure of human glutaminyl cyclase variant Y115E-Y117E in complex with SEN177

Experimental Data Snapshot

  • Resolution: 1.72 Å
  • R-Value Free: 0.183 
  • R-Value Work: 0.158 
  • R-Value Observed: 0.159 

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The structure of the human glutaminyl cyclase-SEN177 complex indicates routes for developing new potent inhibitors as possible agents for the treatment of neurological disorders.

Pozzi, C.Di Pisa, F.Benvenuti, M.Mangani, S.

(2018) J Biol Inorg Chem 23: 1219-1226

  • DOI: https://doi.org/10.1007/s00775-018-1605-1
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Recent evidence links the role of human glutaminyl cyclase (hQC) to the amyloidogenic process involved in Alzheimer's disease (AD). hQC is a zinc enzyme present in neuronal tissue and its activity is responsible for the cyclization of N-terminal Gln or Glu β-amyloid peptides, leading to N-pyroglutamic acid peptides (pE-Aβ) that is probably a crucial event in the initiation and progress of the disease. Indeed, pE-containing peptides exhibit an elevated neurotoxicity and a tendency to aggregate. These observations render hQC inhibition an attractive strategy for developing new molecules active against AD. We present here the crystal structure of hQC in complex with SEN177, a newly designed molecule. The SEN177-binding mode to hQC differs from that of the known hQC inhibitors. SEN177 K i on hQC is 20 nM, comparable or better than that of the most potent known hQC inhibitors PBD150 and PQ912. In addition, SEN177 already demonstrated relevant pharmacological properties in in vivo models of Huntington's disease. All these properties make SEN177 an important scaffold for developing molecules acting on AD and related diseases.

  • Organizational Affiliation

    Department of Biotechnology, Chemistry and Pharmacy, Department of Excellence 2018-2022, University of Siena, via Aldo Moro, 2, 53100, Siena, SI, Italy. stefano.mangani@unisi.it.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Glutaminyl-peptide cyclotransferase
A, B, C
329Homo sapiensMutation(s): 2 
Gene Names: QPCT
UniProt & NIH Common Fund Data Resources
Find proteins for Q16769 (Homo sapiens)
Explore Q16769 
Go to UniProtKB:  Q16769
PHAROS:  Q16769
GTEx:  ENSG00000115828 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ16769
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
S77 (Subject of Investigation/LOI)
Query on S77

Download Ideal Coordinates CCD File 
F [auth A],
N [auth B],
Z [auth C]
C18 H19 F N6
Query on SO4

Download Ideal Coordinates CCD File 
E [auth A],
M [auth B],
Y [auth C]
O4 S
Query on ZN

Download Ideal Coordinates CCD File 
D [auth A],
L [auth B],
X [auth C]
Query on EDO

Download Ideal Coordinates CCD File 
AA [auth C]
BA [auth C]
CA [auth C]
DA [auth C]
EA [auth C]
AA [auth C],
BA [auth C],
CA [auth C],
DA [auth C],
EA [auth C],
FA [auth C],
G [auth A],
H [auth A],
I [auth A],
J [auth A],
K [auth A],
O [auth B],
P [auth B],
Q [auth B],
R [auth B],
S [auth B],
T [auth B],
U [auth B],
V [auth B],
W [auth B]
C2 H6 O2
Binding Affinity Annotations 
IDSourceBinding Affinity
S77 Binding MOAD:  6GBX Ki: 20 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 1.72 Å
  • R-Value Free: 0.183 
  • R-Value Work: 0.158 
  • R-Value Observed: 0.159 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 86.14α = 90
b = 149.81β = 97.18
c = 95.98γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
Aimlessdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2018-09-19
    Type: Initial release
  • Version 1.1: 2018-12-05
    Changes: Data collection, Database references
  • Version 1.2: 2024-01-17
    Changes: Data collection, Database references, Derived calculations, Refinement description