5J9F image
Entry Detail
PDB ID:
5J9F
Title:
Human GAR transformylase in complex with GAR and (4-{[2-(2-Amino-4-oxo-4,7-dihydro-3H-pyrrolo[2,3-d]pyrimidin-6-yl)ethyl]amino}benzoyl)-L-glutamic acid (AGF183)
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2016-04-09
Release Date:
2016-08-10
Method Details:
Experimental Method:
Resolution:
2.10 Å
R-Value Free:
0.21
R-Value Work:
0.17
R-Value Observed:
0.17
Space Group:
P 32 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Trifunctional purine biosynthetic protein adenosine-3
Mutations:Q905A
Chain IDs:A
Chain Length:210
Number of Molecules:1
Biological Source:Homo sapiens
Primary Citation
Tumor Targeting with Novel 6-Substituted Pyrrolo [2,3-d] Pyrimidine Antifolates with Heteroatom Bridge Substitutions via Cellular Uptake by Folate Receptor alpha and the Proton-Coupled Folate Transporter and Inhibition of de Novo Purine Nucleotide Biosynthesis.
J.Med.Chem. 59 7856 7876 (2016)
PMID: 27458733 DOI: 10.1021/acs.jmedchem.6b00594

Abstact

Targeted antifolates with heteroatom replacements of the carbon vicinal to the phenyl ring in 1 by N (4), O (8), or S (9), or with N-substituted formyl (5), acetyl (6), or trifluoroacetyl (7) moieties, were synthesized and tested for selective cellular uptake by folate receptor (FR) α and β or the proton-coupled folate transporter. Results show increased in vitro antiproliferative activity toward engineered Chinese hamster ovary cells expressing FRs by 4-9 over the CH2 analogue 1. Compounds 4-9 inhibited de novo purine biosynthesis and glycinamide ribonucleotide formyltransferase (GARFTase). X-ray crystal structures for 4 with FRα and GARFTase showed that the bound conformations of 4 required flexibility for attachment to both FRα and GARFTase. In mice bearing IGROV1 ovarian tumor xenografts, 4 was highly efficacious. Our results establish that heteroatom substitutions in the 3-atom bridge region of 6-substituted pyrrolo[2,3-d]pyrimidines related to 1 provide targeted antifolates that warrant further evaluation as anticancer agents.

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