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J Med Chem. 2014 Oct 9;57(19):8152-66. doi: 10.1021/jm501113m. Epub 2014 Sep 19.

Structure-activity profiles of novel 6-substituted pyrrolo[2,3-d]pyrimidine thienoyl antifolates with modified amino acids for cellular uptake by folate receptors α and β and the proton-coupled folate transporter.

Author information

1
Division of Medicinal Chemistry, Graduate School of Pharmaceutical Sciences, Duquesne University , 600 Forbes Avenue, Pittsburgh, Pennsylvania 15282, United States.

Abstract

Structure-activity relationships for cellular uptake and inhibition of cell proliferation were studied for 2-amino-4-oxo-6-substituted pyrrolo[2,3-d]pyrimidine thienoyl antifolates in which the terminal l-glutamate of the parent structure (7) was replaced by natural or unnatural amino acids. Compounds 7 and 10-13 were selectively inhibitory toward folate receptor (FR) α-expressing Chinese hamster ovary (CHO) cells. Antiproliferative effects of compounds 7 and 9-13 toward FRα- and FRβ-expressing CHO cells were only partly reflected in binding affinities to FRα and FRβ or in the docking scores with molecular models of FRα and FRβ. Compounds 7 and 11 were potent inhibitors of glycinamide ribonucleotide formyltransferase in de novo purine biosynthesis in KB human tumor cells. These studies establish for the first time the importance of the α- and γ-carboxylic acid groups, the length of the amino acid, and the conformation of the side chain for transporter binding and biological activity of 6-substituted pyrrolo[2,3-d]pyrimidine thienoyl antifolates.

PMID:
25234128
PMCID:
PMC4191586
DOI:
10.1021/jm501113m
[Indexed for MEDLINE]
Free PMC Article

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