TY - JOUR
T1 - Structure of Ddn, the deazaflavin-dependent nitroreductase from Mycobacterium tuberculosis involved in bioreductive activation of PA-824
AU - Cellitti, Susan E.
AU - Shaffer, Jennifer
AU - Jones, David H.
AU - Mukherjee, Tathagata
AU - Gurumurthy, Meera
AU - Bursulaya, Badry
AU - Boshoff, Helena I.
AU - Choi, Inhee
AU - Nayyar, Amit
AU - Lee, Yong Sok
AU - Cherian, Joseph
AU - Niyomrattanakit, Pornwaratt
AU - Dick, Thomas
AU - Manjunatha, Ujjini H.
AU - Barry, Clifton E.
AU - Spraggon, Glen
AU - Geierstanger, Bernhard H.
N1 - Funding Information: The Advanced Light Source is supported by the Director, Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under contract no. DE-AC02-05CH11231. This work was funded, in part, by a grant from The Bill and Melinda Gates Foundation and the Wellcome Trust through the Grand Challenges in Global Health Initiative to the Novartis Institute for Tropical Diseases (NITD) and NIAID; by the NIH intramural research program of NIAID to C.E.B. and of the Center for Information Technology to Y.S.L.; and by NITD. We would like to thank Dr. P. McPhie, Laboratory of Biochemistry and Genetics, NIDDK, NIH for allowing us to run the CD experiments and helping us with the analysis; P. Abdubek, C. Chen, J. Feuerhelm, J. Grant, H. Klock, A. Kreusch, A. Nopakun, L. Okach, C. Puckett, and T. Wooten at the Genomics Institute of the Novartis Research Foundation (GNF) for technical assistance; and S. Lesley (GNF) and C. Noble (NITD) for their valuable comments. S.E.C., U.H.M., C.E.B., G.S., and B.H.G. designed experiments and prepared the manuscript. C.E.B., U.H.M., and T.D. initiated the study and wrote the grants that provided funding. The following data were generated and analyzed by the indicated contributors: molecular biology and protein production and purification by S.E.C., J.S., T.M., and H.I.M.B.; crystallization and structure calculations by S.E.C. and G.S.; NMR by D.H.J.; activity assays by T.M. and P.N.; CD by T.M.; Trp fluorescence by M.G.; computational modeling by B.B., I.C., and Y.S.L.; and chemical synthesis by A.N. and J.C. U.H.M., C.E.B., G.S., and B.H.G. were the subteam leaders at the respective sites and supervised the respective experiments.
PY - 2012/1/11
Y1 - 2012/1/11
N2 - Tuberculosis continues to be a global health threat, making bicyclic nitroimidazoles an important new class of therapeutics. A deazaflavin-dependent nitroreductase (Ddn) from Mycobacterium tuberculosis catalyzes the reduction of nitroimidazoles such as PA-824, resulting in intracellular release of lethal reactive nitrogen species. The N-terminal 30 residues of Ddn are functionally important but are flexible or access multiple conformations, preventing structural characterization of the full-length, enzymatically active enzyme. Several structures were determined of a truncated, inactive Ddn protein core with and without bound F 420 deazaflavin coenzyme as well as of a catalytically competent homolog from Nocardia farcinica. Mutagenesis studies based on these structures identified residues important for binding of F 420 and PA-824. The proposed orientation of the tail of PA-824 toward the N terminus of Ddn is consistent with current structure-activity relationship data.
AB - Tuberculosis continues to be a global health threat, making bicyclic nitroimidazoles an important new class of therapeutics. A deazaflavin-dependent nitroreductase (Ddn) from Mycobacterium tuberculosis catalyzes the reduction of nitroimidazoles such as PA-824, resulting in intracellular release of lethal reactive nitrogen species. The N-terminal 30 residues of Ddn are functionally important but are flexible or access multiple conformations, preventing structural characterization of the full-length, enzymatically active enzyme. Several structures were determined of a truncated, inactive Ddn protein core with and without bound F 420 deazaflavin coenzyme as well as of a catalytically competent homolog from Nocardia farcinica. Mutagenesis studies based on these structures identified residues important for binding of F 420 and PA-824. The proposed orientation of the tail of PA-824 toward the N terminus of Ddn is consistent with current structure-activity relationship data.
UR - https://www.scopus.com/pages/publications/84862925406
U2 - 10.1016/j.str.2011.11.001
DO - 10.1016/j.str.2011.11.001
M3 - Article
C2 - 22244759
SN - 0969-2126
VL - 20
SP - 101
EP - 112
JO - Structure
JF - Structure
IS - 1
ER -