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6how

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Trypanosoma brucei PTR1 in complex with the triazine inhibitor 2a (F219).

Structural highlights

6how is a 4 chain structure with sequence from Trypanosoma brucei brucei. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	X-ray diffraction, Resolution 1.92Å
Ligands:	, ,
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

O76290_TRYBB

Publication Abstract from PubMed

Cycloguanil is a known dihydrofolate-reductase (DHFR) inhibitor, but there is no evidence of its activity on pteridine reductase (PTR), the main metabolic bypass to DHFR inhibition in trypanosomatid parasites. Here, we provide experimental evidence of cycloguanil as an inhibitor of Trypanosoma brucei PTR1 ( TbPTR1). A small library of cycloguanil derivatives was developed, resulting in 1 and 2a having IC50 values of 692 and 186 nM, respectively, toward TbPTR1. Structural analysis revealed that the increased potency of 1 and 2a is due to the combined contributions of hydrophobic interactions, H-bonds, and halogen bonds. Moreover, in vitro cell-growth-inhibition tests indicated that 2a is also effective on T. brucei. The simultaneous inhibition of DHFR and PTR1 activity in T. brucei is a promising new strategy for the treatment of human African trypanosomiasis. For this purpose, 1,6-dihydrotriazines represent new molecular tools to develop potent dual PTR and DHFR inhibitors.

Structural Insights into the Development of Cycloguanil Derivatives as Trypanosoma brucei Pteridine-Reductase-1 Inhibitors.,Landi G, Linciano P, Borsari C, Bertolacini CP, Moraes CB, Cordeiro-da-Silva A, Gul S, Witt G, Kuzikov M, Costi MP, Pozzi C, Mangani S ACS Infect Dis. 2019 May 1. doi: 10.1021/acsinfecdis.8b00358. PMID:31012301^[1]

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

References

↑ Landi G, Linciano P, Borsari C, Bertolacini CP, Moraes CB, Cordeiro-da-Silva A, Gul S, Witt G, Kuzikov M, Costi MP, Pozzi C, Mangani S. Structural Insights into the Development of Cycloguanil Derivatives as Trypanosoma brucei Pteridine-Reductase-1 Inhibitors. ACS Infect Dis. 2019 May 1. doi: 10.1021/acsinfecdis.8b00358. PMID:31012301 doi:http://dx.doi.org/10.1021/acsinfecdis.8b00358