8RX3

LTA4 hydrolase in complex with CTX-4430


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.183 
  • R-Value Work: 0.155 
  • R-Value Observed: 0.156 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.2 of the entry. See complete history


Literature

Structure-Guided Elaboration of a Fragment-Like Hit into an Orally Efficacious Leukotriene A4 Hydrolase Inhibitor.

Thoma, G.Miltz, W.Srinivas, H.Penno, C.A.Kiffe, M.Gajewska, M.Klein, K.Evans, A.Beerli, C.Rohn, T.A.

(2024) J Med Chem 67: 5093-5108

  • DOI: https://doi.org/10.1021/acs.jmedchem.4c00290
  • Primary Citation of Related Structures:  
    8RX3, 8RX7, 8RX9

  • PubMed Abstract: 

    Leukotriene A4 hydrolase (LTA4H) is the final and rate-limiting enzyme in the biosynthesis of pro-inflammatory leukotriene B4 (LTB 4 ). Preclinical studies have provided strong evidence that LTA4H is an attractive drug target for the treatment of chronic inflammatory diseases. Here, we describe the transformation of compound 2 , a fragment-like hit, into the potent inhibitor of LTA4H 3 . Our strategy involved two key steps. First, we aimed to increase the polarity of fragment 2 to improve its drug-likeness, particularly its solubility, while preserving both its promising potency and low molecular weight. Second, we utilized structural information and incorporated a basic amino function, which allowed for the formation of an essential hydrogen bond with Q136 of LTA4H and consequently enhanced the potency. Compound 3 exhibited exceptional selectivity and showed oral efficacy in a KRN passive serum-induced arthritis model in mice. The anticipated human dose to achieve 90% target engagement at the trough concentration was determined to be 40 mg administered once daily.


  • Organizational Affiliation

    Global Discovery Chemistry, Biomedical Research, Novartis Pharma AG, 4002 Basel, Switzerland.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Leukotriene A-4 hydrolase613Homo sapiensMutation(s): 0 
Gene Names: LTA4HLTA4
EC: 3.3.2.6 (PDB Primary Data), 3.4.11.4 (UniProt)
UniProt & NIH Common Fund Data Resources
Find proteins for P09960 (Homo sapiens)
Explore P09960 
Go to UniProtKB:  P09960
PHAROS:  P09960
GTEx:  ENSG00000111144 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP09960
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 5 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
A1H3T (Subject of Investigation/LOI)
Query on A1H3T

Download Ideal Coordinates CCD File 
H [auth A]4-[[(1~{S},4~{S})-5-[[4-[4-(1,3-oxazol-2-yl)phenoxy]phenyl]methyl]-2,5-diazabicyclo[2.2.1]heptan-2-yl]methyl]benzoic acid
C29 H27 N3 O4
GERJIEKMNDGSCS-DQEYMECFSA-N
YB
Query on YB

Download Ideal Coordinates CCD File 
D [auth A],
E [auth A]
YTTERBIUM (III) ION
Yb
AWSFICBXMUKWSK-UHFFFAOYSA-N
IMD
Query on IMD

Download Ideal Coordinates CCD File 
F [auth A],
G [auth A]
IMIDAZOLE
C3 H5 N2
RAXXELZNTBOGNW-UHFFFAOYSA-O
ZN
Query on ZN

Download Ideal Coordinates CCD File 
B [auth A]ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
ACT
Query on ACT

Download Ideal Coordinates CCD File 
C [auth A]ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.183 
  • R-Value Work: 0.155 
  • R-Value Observed: 0.156 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 77.572α = 90
b = 87.449β = 90
c = 98.847γ = 90
Software Package:
Software NamePurpose
BUSTERrefinement
autoPROCdata reduction
XSCALEdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data

  • Released Date: 2024-03-20 
  • Deposition Author(s): Srinivas, H.

Funding OrganizationLocationGrant Number
Not fundedSwitzerland--

Revision History  (Full details and data files)

  • Version 1.0: 2024-03-20
    Type: Initial release
  • Version 1.1: 2024-03-27
    Changes: Database references
  • Version 1.2: 2024-04-10
    Changes: Database references