Human Histidine Triad Nucleotide Binding Protein 1 (Hint1) with Bound 5'-O-[1-Ethyl]Carbamoyl Guanosine

Experimental Data Snapshot

  • Resolution: 1.45 Å
  • R-Value Free: 0.174 
  • R-Value Work: 0.157 
  • R-Value Observed: 0.158 

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Inhibition of HINT1 Modulates Spinal Nociception and NMDA Evoked Behavior in Mice.

Shah, R.M.Peterson, C.Strom, A.Dillenburg, M.Finzel, B.Kitto, K.F.Fairbanks, C.Wilcox, G.Wagner, C.R.

(2019) ACS Chem Neurosci 10: 4385-4393

  • DOI: https://doi.org/10.1021/acschemneuro.9b00432
  • Primary Citation of Related Structures:  
    6N3V, 6N3W, 6N3X, 6N3Y

  • PubMed Abstract: 

    The interactions between the mu-opioid (MOR) and N -methyl-d-aspartate receptor (NMDAR) constitute an area of intense investigation because of their contributions to maladaptive neuroplasticity. Recent evidence suggests that their association requires the involvement of histidine triad nucleotide-binding protein (HINT1) with the enzyme's active site being critical in its regulatory role. Since it is known that spinal blockade of NMDA receptors prevents the development of opioid analgesic tolerance, we hypothesized that spinal inhibition of the HINT1 enzyme may similarly inhibit opioid tolerance. To address these questions, we evaluated novel HINT1 active-site inhibitors in two models of NMDAR and MOR interaction, namely, MOR inhibition of spinal NMDA activation and acute endomorphin-2 tolerance. These studies revealed that while the tryptamine carbamate of guanosine inhibitor, TrpGc, blocked both the development of opioid tolerance and the inhibitory effect of opioids on NMDA activation of the NMDA receptor, acyl-sulfamate analogues could only block the latter. Thermodynamic binding and X-ray crystallographic studies suggested that there are key differences between the bound HINT1-inhibitor surfaces that may be responsible for their differential ability to probe the ability of HINT1 to regulate cross talk between the mu-opioid receptor and NMDA receptor in the spinal cord.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Histidine triad nucleotide-binding protein 1
A, B
129Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P49773 (Homo sapiens)
Explore P49773 
Go to UniProtKB:  P49773
PHAROS:  P49773
GTEx:  ENSG00000169567 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP49773
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on KB7

Download Ideal Coordinates CCD File 
C [auth A]5'-O-(ethylcarbamoyl)guanosine
C13 H18 N6 O6
Query on CL

Download Ideal Coordinates CCD File 
Binding Affinity Annotations 
IDSourceBinding Affinity
KB7 Binding MOAD:  6N3V Kd: 2450 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 1.45 Å
  • R-Value Free: 0.174 
  • R-Value Work: 0.157 
  • R-Value Observed: 0.158 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 77.922α = 90
b = 46.306β = 94.96
c = 63.96γ = 90
Software Package:
Software NamePurpose
XDSdata scaling
PDB_EXTRACTdata extraction
XDSdata reduction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2019-09-18
    Type: Initial release
  • Version 1.1: 2019-10-30
    Changes: Data collection, Database references
  • Version 1.2: 2023-10-11
    Changes: Data collection, Database references, Refinement description