3i9m | pdb_00003i9m

Crystal structure of human CD38 complexed with an analog ara-2'F-ADPR

spinqualitylabelsall models 3i9m, resolution 1.75Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3i9m is a 2 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: AVU Related: 3i9j, 3i9k, 3i9l, 3i9n Gene: CD38 (Homo sapiens) Activity: NAD(+) nucleosidase, with EC number 3.2.2.5 Resources: FirstGlance, OCA, RCSB, PDBsum Function [CD38_HUMAN] Synthesizes cyclic ADP-ribose, a second messenger for glucose-induced insulin secretion. Also has cADPr hydrolase activity. Also moonlights as a receptor in cells of the immune system. 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 PubMed Cyclic ADP-ribose (cADPR) is a universal calcium messenger molecule that regulates many physiological processes. The production and degradation of cADPR are catalyzed by a family of related enzymes, including the ADP-ribosyl cyclase from Aplysia california (ADPRAC) and CD38 from human. Although ADPRC and CD38 share a common evolutionary ancestor, their enzymatic functions toward NAD and cADPR homeostasis have evolved divergently. Thus, ADPRC can only generate cADPR from NAD (cyclase), whereas CD38, in contrast, has multiple activities, i.e. in cADPR production and degradation, as well as NAD hydrolysis (NADase). In this study, we determined a number of ADPRC and CD38 structures bound with various nucleotides. From these complexes, we elucidated the structural features required for the cyclization (cyclase) reaction of ADPRC and the NADase reaction of CD38. Using the structural approach in combination with site-directed mutagenesis, we identified Phe-174 in ADPRC as a critical residue in directing the folding of the substrate during the cyclization reaction. Thus, a point mutation of Phe-174 to glycine can turn ADPRC from a cyclase toward an NADase. The equivalent residue in CD38, Thr-221, is shown to disfavor the cyclizing folding of the substrate, resulting in NADase being the dominant activity. The comprehensive structural comparison of CD38 and APDRC presented in this study thus provides insights into the structural determinants for the functional evolution from a cyclase to a hydrolase. Structural basis for enzymatic evolution from a dedicated ADP-ribosyl cyclase to a multifunctional NAD hydrolase.,Liu Q, Graeff R, Kriksunov IA, Jiang H, Zhang B, Oppenheimer N, Lin H, Potter BV, Lee HC, Hao Q J Biol Chem. 2009 Oct 2;284(40):27637-45. Epub 2009 Jul 28. PMID:19640846 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Cluster of Differentiation CD38

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