Structural highlights
Function[NT5M_HUMAN] Dephosphorylates specifically the 5' and 2'(3')-phosphates of uracil and thymine deoxyribonucleotides, and so protects mitochondrial DNA replication from excess dTTP. Has only marginal activity towards dIMP and dGMP. Publication Abstract from PubMedThis work describes novel in vitro inhibitors of human mitochondrial (mdN) and cytosolic (cdN) 5'(3')-deoxynucleotidases. We designed a series of derivatives of the lead compound (S)-1-[2-deoxy-3,5-O-(phosphonobenzylidene)-beta-d-threo-pentofuranosyl]thymine bearing various substituents in the para position of the benzylidene moiety. Detailed kinetic study revealed that certain para substituents increase the inhibitory potency (iodo derivative; K = 2.71 muM) and some induce a shift in selectivity toward cdN (carboxy derivative, K = 11.60 muM; iodoxy derivative, K = 6.60 muM). Crystal structures of mdN in complex with three of these compounds revealed that various para substituents lead to two alternative inhibitor binding modes within the enzyme active site. Two binding modes were also identified for cdN complexes by heteronuclear NMR spectroscopy. Conformationally constrained nucleoside phosphonic acids - potent inhibitors of human mitochondrial and cytosolic 5'(3')-nucleotidases.,Simak O, Pachl P, Fabry M, Budesinsky M, Jandusik T, Hnizda A, Sklenickova R, Petrova M, Veverka V, Rezacova P, Brynda J, Rosenberg I Org Biomol Chem. 2014 Sep 1. PMID:25178098[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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