ADP-ribosyl cyclase; crystal structures reveal a covalent intermediate.
Love, M.L., Szebenyi, D.M., Kriksunov, I.A., Thiel, D.J., Munshi, C., Graeff, R., Lee, H.C., Hao, Q.(2004) Structure 12: 477-486
- PubMed: 15016363 
- DOI: 10.1016/j.str.2004.02.006
- Primary Citation of Related Structures:  
1R0S, 1R12, 1R15, 1R16 - PubMed Abstract: 
ADP-ribosyl cyclase catalyzes the elimination of nicotinamide from NAD and cyclization to cADPR, a known second messenger in cellular calcium signaling pathways. We have determined to 2.0 A resolution the structure of Aplysia cyclase with ribose-5-phosphate bound covalently at C3' and with the base exchange substrate (BES), pyridylcarbinol, bound to the active site ...