1hpu | pdb_00001hpu
5'-NUCLEOTIDASE (CLOSED FORM), COMPLEX WITH AMPCP
Structural highlights
Function[USHA_ECOLI] Degradation of external UDP-glucose to uridine monophosphate and glucose-1-phosphate, which can then be used by the cell. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed5'-Nucleotidase belongs to a large superfamily of distantly related dinuclear metallophosphatases including the Ser/Thr protein phosphatases and purple acid phosphatases. The protein undergoes a 96 degrees domain rotation between an open (inactive) and a closed (active) enzyme form. Complex structures of the closed form with the products adenosine and phosphate, and with the substrate analogue inhibitor alpha,beta-methylene ADP, have been determined at 2.1 A and 1.85 A resolution, respectively. In addition, a complex of the open form of 5'-nucleotidase with ATP was analyzed at a resolution of 1.7 A. These structures show that the adenosine group binds to a specific binding pocket of the C-terminal domain. The adenine ring is stacked between Phe429 and Phe498. The N-terminal domain provides the ligands to the dimetal cluster and the conserved His117, which together form the catalytic core structure. However, the three C-terminal arginine residues 375, 379 and 410, which are involved in substrate binding, may also play a role in transition-state stabilization. The beta-phosphate group of the inhibitor is terminally coordinated to the site 2 metal ion. The site 1 metal ion coordinates a water molecule which is in an ideal position for a nucleophilic attack on the phosphorus atom, assuming an in-line mechanism of phosphoryl transfer. Another water molecule bridges the two metal ions. Mechanism of hydrolysis of phosphate esters by the dimetal center of 5'-nucleotidase based on crystal structures.,Knofel T, Strater N J Mol Biol. 2001 May 25;309(1):239-54. PMID:11491293[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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