Activation of the abundant nuclear factor poly(ADP-ribose) polymerase-1 by Helicobacter pylori.


Journal Article

Modification of eukaryotic proteins is a powerful strategy used by pathogenic bacteria to modulate host cells during infection. Previously, we demonstrated that Helicobacter pylori modify an unidentified protein within mammalian cell lysates in a manner consistent with the action of a bacterial ADP-ribosylating toxin. Here, we identified the modified eukaryotic factor as the abundant nuclear factor poly(ADP-ribose) polymerase-1 (PARP-1), which is important in the pathologies of several disease states typically associated with chronic H. pylori infection. However, rather than being ADP-ribosylated by an H. pylori toxin, the intrinsic poly(ADP-ribosyl) polymerase activity of PARP-1 is activated by a heat- and protease-sensitive H. pylori factor, resulting in automodification of PARP-1 with polymers of poly(ADP-ribose) (PAR). Moreover, during infection of gastric epithelial cells, H. pylori induce intracellular PAR-production by a PARP-1-dependent mechanism. Activation of PARP-1 by a pathogenic bacterium represents a previously unrecognized strategy for modulating host cell signaling during infection.

Full Text

Cited Authors

  • Nossa, CW; Jain, P; Tamilselvam, B; Gupta, VR; Chen, L-F; Schreiber, V; Desnoyers, S; Blanke, SR

Published Date

  • November 6, 2009

Published In

Volume / Issue

  • 106 / 47

Start / End Page

  • 19998 - 20003

PubMed ID

  • 19897724

Pubmed Central ID

  • 19897724

Electronic International Standard Serial Number (EISSN)

  • 1091-6490

International Standard Serial Number (ISSN)

  • 0027-8424

Digital Object Identifier (DOI)

  • 10.1073/pnas.0906753106


  • eng