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4iqt

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Tdt core in complex with inhibitor 6-[4-(3-fluorobenzoyl)-1H-pyrrol-2-yl]-2-hydroxy-4-oxohexa-2,5-dienoic acid

Structural highlights

4iqt is a 1 chain structure with sequence from Mus musculus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	X-ray diffraction, Resolution 2.6Å
Ligands:
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

TDT_MOUSE Template-independent DNA polymerase which catalyzes the random addition of deoxynucleoside 5'-triphosphate to the 3'-end of a DNA initiator. One of the in vivo functions of this enzyme is the addition of nucleotides at the junction (N region) of rearranged Ig heavy chain and T-cell receptor gene segments during the maturation of B- and T-cells.

Publication Abstract from PubMed

Terminal deoxynucletidyl transferase (TdT) is overexpressed in some cancer types, where it might compete with pol mu driving the mutagenic repair of double strand breaks (DSBs) through the non homologous end joining (NHEJ) pathway. Here we report the discovery and characterization of pyrrolyl and indolyl diketo acids that specifically target TdT and behave as nucleotide-competitive inhibitors. These compounds show a selective toxicity towards MOLT-4 compared to HeLa cells that correlate well with in vitro selectivity for TdT. The binding site of two of these inhibitors was determined by co-crystallization with TdT, explaining why these compounds are competitive inhibitors of the deoxynucleotide triphosphate (dNTP). In addition, because of the observed dual localization of the phenyl substituent, these studies open the possibility to rationally design more potent compounds.

New Nucleotide-Competitive Non-Nucleoside Inhibitors of Terminal Deoxynucleotidyl Transferase: Discovery, Characterization and Crystal Structure in Complex with the Target.,Costi R, Cuzzucoli Crucitti G, Pescatori L, Messore A, Scipione L, Tortorella S, Amoroso A, Crespan E, Campiglia P, Maresca B, Novellino E, Gouge J, Delarue MH, Maga G, Di Santo R J Med Chem. 2013 Aug 22. PMID:23968551^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Costi R, Cuzzucoli Crucitti G, Pescatori L, Messore A, Scipione L, Tortorella S, Amoroso A, Crespan E, Campiglia P, Maresca B, Novellino E, Gouge J, Delarue MH, Maga G, Di Santo R. New Nucleotide-Competitive Non-Nucleoside Inhibitors of Terminal Deoxynucleotidyl Transferase: Discovery, Characterization and Crystal Structure in Complex with the Target. J Med Chem. 2013 Aug 22. PMID:23968551 doi:10.1021/jm4010187