6DYZ

Crystal structure of human 5'-deoxy-5'-methylthioadenosine phosphorylase in complex with (3R,4S)-1-((4-amino-5H-pyrrolo[3,2-d]pyrimidin-7-yl)methyl)-4-((prop-2-yn-1-ylthio)methyl)pyrrolidin-3-ol

Summary for 6DYZ

• Entry DOI: 10.2210/pdb6dyz/pdb
• Descriptor: S-methyl-5'-thioadenosine phosphorylase, CHLORIDE ION, PHOSPHATE ION, ... (6 entities in total)
• Functional Keywords: mtap enzyme, cancer, phosphorylase, transferase
• Biological source: Homo sapiens (Human)
• Total number of polymer chains: 1
• Total formula weight: 33788.54

Authors

Harijan, R.K.,Ducati, R.G.,Bonanno, J.B.,Almo, S.C.,Schramm, V.L. (deposition date: 2018-07-02, release date: 2019-03-20, Last modification date: 2023-10-11)

Primary citation

Harijan, R.K.,Hoff, O.,Ducati, R.G.,Firestone, R.S.,Hirsch, B.M.,Evans, G.B.,Schramm, V.L.,Tyler, P.C.
Selective Inhibitors of Helicobacter pylori Methylthioadenosine Nucleosidase and Human Methylthioadenosine Phosphorylase.
J. Med. Chem., 62:3286-3296, 2019

PubMed Abstract: Bacterial 5'-methylthioadenosine/ S-adenosylhomocysteine nucleosidase (MTAN) hydrolyzes adenine from its substrates to form S-methyl-5-thioribose and S-ribosyl-l-homocysteine. MTANs are involved in quorum sensing, menaquinone synthesis, and 5'-methylthioadenosine recycling to S-adenosylmethionine. Helicobacter pylori uses MTAN in its unusual menaquinone pathway, making H. pylori MTAN a target for antibiotic development. Human 5'-methylthioadenosine phosphorylase (MTAP), a reported anticancer target, catalyzes phosphorolysis of 5'-methylthioadenosine to salvage S-adenosylmethionine. Transition-state analogues designed for HpMTAN and MTAP show significant overlap in specificity. Fifteen unique transition-state analogues are described here and are used to explore inhibitor specificity. Several analogues of HpMTAN bind in the picomolar range while inhibiting human MTAP with orders of magnitude weaker affinity. Structural analysis of HpMTAN shows inhibitors extending through a hydrophobic channel to the protein surface. The more enclosed catalytic sites of human MTAP require the inhibitors to adopt a folded structure, displacing the phosphate nucleophile from the catalytic site.

PubMed: 30860833
DOI: 10.1021/acs.jmedchem.8b01642

Experimental method

X-RAY DIFFRACTION (1.62 Å)