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Nucleoside diphosphate kinase of Mycobacterium tuberculosis acts as GTPase-activating protein for Rho-GTPases. 2004

Puneet Chopra, and Harshavardhan Koduri, and Ramandeep Singh, and Anil Koul, and Megha Ghildiyal, and Kirti Sharma, and Anil K Tyagi, and Yogendra Singh
Institute of Genomics and Integrative Biology, Mall Road, Delhi, India.

Several bacterial pathogens secrete proteins into the host cells that act as GTPase-activating proteins (GAPs) for Rho-GTPases and convert GTP-bound active form to GDP-bound inactive form. However, no such effector molecule has been identified in Mycobacterium tuberculosis. In this study, we show that culture supernatant of M. tuberculosis H(37)Rv harbors a protein that stimulates the conversion of GTP-bound Rho-GTPases to the GDP-bound form. Nucleoside diphosphate kinase (Ndk) was identified as this culture supernatant protein that stimulated in vitro GTP hydrolysis by members of Rho-GTPases. The histidine-117 mutant of Ndk, which is impaired for autophosphorylation and nucleotide-binding activities, shows GAP activity. These results suggest that Ndk of M. tuberculosis functions as a Rho-GAP to downregulate Rho-GTPases, and this activity may aid in pathogenesis of the bacteria.

UI MeSH Term Description Entries
D007700 Kinetics The rate dynamics in chemical or physical systems.
D009169 Mycobacterium tuberculosis A species of gram-positive, aerobic bacteria that produces TUBERCULOSIS in humans, other primates, CATTLE; DOGS; and some other animals which have contact with humans. Growth tends to be in serpentine, cordlike masses in which the bacilli show a parallel orientation. Mycobacterium tuberculosis H37Rv
D009701 Nucleoside-Diphosphate Kinase An enzyme that is found in mitochondria and in the soluble cytoplasm of cells. It catalyzes reversible reactions of a nucleoside triphosphate, e.g., ATP, with a nucleoside diphosphate, e.g., UDP, to form ADP and UTP. Many nucleoside diphosphates can act as acceptor, while many ribo- and deoxyribonucleoside triphosphates can act as donor. EC 2.7.4.6. Deoxynucleoside Diphosphate Kinases,GDP Kinase,Nucleoside Diphosphokinases,Nucleoside-Diphosphate Kinases,Diphosphate Kinases, Deoxynucleoside,Diphosphokinases, Nucleoside,Kinase, GDP,Kinase, Nucleoside-Diphosphate,Kinases, Deoxynucleoside Diphosphate,Kinases, Nucleoside-Diphosphate,Nucleoside Diphosphate Kinase,Nucleoside Diphosphate Kinases
D006153 Guanosine Diphosphate A guanine nucleotide containing two phosphate groups esterified to the sugar moiety. GDP,Guanosine 5'-Diphosphate,Guanosine 5'-Trihydrogen Diphosphate,5'-Diphosphate, Guanosine,5'-Trihydrogen Diphosphate, Guanosine,Diphosphate, Guanosine,Diphosphate, Guanosine 5'-Trihydrogen,Guanosine 5' Diphosphate,Guanosine 5' Trihydrogen Diphosphate
D006160 Guanosine Triphosphate Guanosine 5'-(tetrahydrogen triphosphate). A guanine nucleotide containing three phosphate groups esterified to the sugar moiety. GTP,Triphosphate, Guanosine
D020558 GTP Phosphohydrolases Enzymes that hydrolyze GTP to GDP. EC 3.6.1.-. GTPase,GTPases,Guanosine Triphosphate Phosphohydrolases,Guanosinetriphosphatases,GTP Phosphohydrolase,Phosphohydrolase, GTP,Phosphohydrolases, GTP,Phosphohydrolases, Guanosine Triphosphate,Triphosphate Phosphohydrolases, Guanosine
D020690 GTPase-Activating Proteins Proteins that activate the GTPase of specific GTP-BINDING PROTEINS. GAP Proteins,GAP Protein,GTPase-Activating Protein,GTPase Activating Protein,GTPase Activating Proteins

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