5O0I

ADP-dependent glucokinase from Pyrococcus horikoshii

Summary for 5O0I

• Entry DOI: 10.2210/pdb5o0i/pdb
• Descriptor: ADP-dependent glucokinase, SULFATE ION, 1,2-ETHANEDIOL, ... (5 entities in total)
• Functional Keywords: adp-dependent glucokinase, transferase
• Biological source: Pyrococcus horikoshii (strain ATCC 700860 / DSM 12428 / JCM 9974 / NBRC 100139 / OT-3)
• Total number of polymer chains: 1
• Total formula weight: 52676.38

Authors

Grudnik, P.,Dubin, G. (deposition date: 2017-05-16, release date: 2018-05-30, Last modification date: 2024-01-17)

Primary citation

Grudnik, P.,Kaminski, M.M.,Rembacz, K.P.,Kuska, K.,Madej, M.,Potempa, J.,Dawidowski, M.,Dubin, G.
Structural basis for ADP-dependent glucokinase inhibition by 8-bromo-substituted adenosine nucleotide.
J. Biol. Chem., 293:11088-11099, 2018

PubMed Abstract: In higher eukaryotes, several ATP-utilizing enzymes known as hexokinases activate glucose in the glycolysis pathway by phosphorylation to glucose 6-phosphate. In contrast to canonical hexokinases, which use ATP, ADP-dependent glucokinase (ADPGK) catalyzes noncanonical phosphorylation of glucose to glucose 6-phosphate using ADP as a phosphate donor. Initially discovered in Archaea, the human homolog of ADPGK was described only recently. ADPGK's involvement in modified bioenergetics of activated T cells has been postulated, and elevated ADPGK expression has been reported in various cancer tissues. However, the physiological role of ADPGK is still poorly understood, and effective ADPGK inhibitors still await discovery. Here, we show that 8-bromo-substituted adenosine nucleotide inhibits human ADPGK. By solving the crystal structure of archaeal ADPGK in complex with 8-bromoadenosine phosphate (8-Br-AMP) at 1.81 Å resolution, we identified the mechanism of inhibition. We observed that 8-Br-AMP is a competitive inhibitor of ADPGK and that the bromine substitution induces marked structural changes within the protein's active site by engaging crucial catalytic residues. The results obtained using the Jurkat model of activated human T cells suggest its moderate activity in a cellular setting. We propose that our structural insights provide a critical basis for rational development of novel ADPGK inhibitors.

PubMed: 29784881
DOI: 10.1074/jbc.RA117.001562

Experimental method

X-RAY DIFFRACTION (2 Å)