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    Science. 2006 Jan 13;311(5758):222-6. Epub 2005 Dec 22.

    A bacterial inhibitor of host programmed cell death defenses is an E3 ubiquitin ligase.

    Janjusevic R, Abramovitch RB, Martin GB, Stebbins CE.

    Laboratory of Structural Microbiology, Rockefeller University, New York, NY 10021, USA.

    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.

    PMID: 16373536 [PubMed - indexed for MEDLINE]

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