A Bacterial Inhibitor of Host Programmed Cell Death Defenses is an E3 Ubiquitin Ligase
Journal Article
·
· Science
OSTI ID:913744
The Pseudomonas syringae protein AvrPtoB is translocated into plant cells, where it inhibits immunity-associated programmed cell death (PCD). The structure of a C-terminal domain of AvrPtoB that is essential for anti-PCD activity reveals an unexpected homology to the U-box and RING-finger components of eukaryotic E3 ubiquitin ligases, and we show that AvrPtoB has ubiquitin ligase activity. Mutation of conserved residues involved in the binding of E2 ubiquitin-conjugating enzymes abolishes this activity in vitro, as well as anti-PCD activity in tomato leaves, which dramatically decreases virulence. These results show that Pseudomonas syringae uses a mimic of host E3 ubiquitin ligases to inactivate plant defenses.
- Research Organization:
- Brookhaven National Laboratory (BNL) National Synchrotron Light Source
- Sponsoring Organization:
- Doe - Office Of Science
- DOE Contract Number:
- AC02-98CH10886
- OSTI ID:
- 913744
- Report Number(s):
- BNL--78312-2007-JA
- Journal Information:
- Science, Journal Name: Science Vol. 311; ISSN 0193-4511; ISSN SCEHDK
- Country of Publication:
- United States
- Language:
- English
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