Probing the beta-pocket of the active site of human liver glycogen phosphorylase with 3-(C-beta-d-glucopyranosyl)-5-(4-substituted-phenyl)-1, 2, 4-triazole inhibitors.

(2018) Bioorg Chem 77: 485-493

• PubMed: 29454281 Search on PubMed
• DOI: https://doi.org/10.1016/j.bioorg.2018.02.008
• Primary Citation Related Structures: 
  5OWY, 5OWZ, 5OX0, 5OX1, 5OX3, 5OX4


• PubMed Abstract: 
  

  Human liver glycogen phosphorylase (hlGP), a key enzyme in glycogen metabolism, is a valid pharmaceutical target for the development of new anti-hyperglycaemic agents for type 2 diabetes. Inhibitor discovery studies have focused on the active site and in particular on glucopyranose based compounds with a β-1 substituent long enough to exploit interactions with a cavity adjacent to the active site, termed the β-pocket. Recently, C-β-d-glucopyranosyl imidazoles and 1, 2, 4-triazoles proved to be the best known glucose derived inhibitors of hlGP. Here we probe the β-pocket by studying the inhibitory effect of six different groups at the para position of 3-(β-d-glucopyranosyl phenyl)-5-phenyl-, 1, 2, 4-triazoles in hlGP by kinetics and X-ray crystallography. The most bioactive compound was the one with an amine substituent to show a K _i value of 0.43 μM. Structural studies have revealed the physicochemical diversity of the β-pocket providing information for future rational inhibitor design studies.

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Organizational Affiliation: 
• Department of Biochemistry and Biotechnology, University of Thessaly, Biopolis, 41500 Larissa, Greece.
Department of Organic Chemistry, University of Debrecen, POB 400, H-4002 Debrecen, Hungary.
Department of Organic Chemistry, University of Debrecen, POB 400, H-4002 Debrecen, Hungary. Electronic address: somsak@tigris.unideb.hu.
Department of Biochemistry and Biotechnology, University of Thessaly, Biopolis, 41500 Larissa, Greece. Electronic address: ddleonidas@bio.uth.gr.
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