4H2B

Human ecto-5'-nucleotidase (CD73): crystal form II (open) in complex with Baicalin

Summary for 4H2B

• Entry DOI: 10.2210/pdb4h2b/pdb
• Related: 4H1Y 4h2f 4h2g 4h2i
• Descriptor: 5'-nucleotidase, ZINC ION, 5,6-dihydroxy-4-oxo-2-phenyl-4H-chromen-7-yl beta-D-glucopyranosiduronic acid, ... (6 entities in total)
• Functional Keywords: dimer, hydrolase phosphatase nucleotidase, extracellular, hydrolase-hydrolase inhibitor complex, hydrolase/hydrolase inhibitor
• Biological source: Homo sapiens (human)
• Cellular location: Cell membrane; Lipid-anchor, GPI-anchor: P21589
• Total number of polymer chains: 1
• Total formula weight: 61214.16

Authors

Zebisch, M.,Pippel, J.,Knapp, K.,Straeter, N. (deposition date: 2012-09-12, release date: 2012-11-28, Last modification date: 2024-11-06)

Primary citation

Knapp, K.,Zebisch, M.,Pippel, J.,El-Tayeb, A.,Muller, C.E.,Strater, N.
Crystal Structure of the Human Ecto-5'-Nucleotidase (CD73): Insights into the Regulation of Purinergic Signaling.
Structure, 20:2161-2173, 2012

PubMed Abstract: In vertebrates ecto-5'-nucleotidase (e5NT) catalyzes the hydrolysis of extracellular AMP to adenosine and represents the major control point for extracellular adenosine levels. Due to its pivotal role for activation of P1 adenosine receptors, e5NT has emerged as an appealing drug target for treatment of inflammation, chronic pain, hypoxia, and cancer. Crystal structures of the dimeric human e5NT reveal an extensive 114° conformational switch between the open and closed forms of the enzyme. The dimerization interface is formed by the C-terminal domains and exhibits interchain motions of up to 13°. Complex structures with adenosine and AMPCP indicate that structural control of the domain movement determines the selectivity for monophosphate nucleotides. Binding modes of nucleotide-derived and flavonoid-based compounds complexed to the C-terminal domain in the open form reveal an additional binding pocket of ∼210 Å(3) that might be explored to design more potent inhibitors.

PubMed: 23142347
DOI: 10.1016/j.str.2012.10.001

Experimental method

X-RAY DIFFRACTION (1.7 Å)