Cancer Institute A national cancer institute
designated cancer center

Matthew Bogyo

Publication Details

  • A Substrate-Inspired Probe Monitors Translocation, Activation, and Subcellular Targeting of Bacterial Type III Effector Protease AvrPphB CHEMISTRY & BIOLOGY Lu, H., Wang, Z., Shabab, M., Oeljeklaus, J., Verhelst, S. H., Kaschani, F., Kaiser, M., Bogyo, M., van der Hoorn, R. A. 2013; 20 (2): 168-176


    The AvrPphB effector of Pseudomonas syringae is a papain-like protease that is injected into the host plant cell and cleaves specific kinases to disrupt immune signaling. Here, we used the unique substrate specificity of AvrPphB to generate a specific activity-based probe. This probe displays various AvrPphB isoforms in bacterial extracts, upon secretion and inside the host plant. We show that AvrPphB is secreted as a proprotease and that secretion requires the prodomain, but probably does not involve a pH-dependent unfolding mechanism. The prodomain removal is required for the ability of AvrPphB to trigger a hypersensitive cell death in resistant host plants, presumably since processing exposes a hidden acylation site required for subcellular targeting in the host cell. We detected two active isoforms of AvrPphB in planta, of which the major one localizes exclusively to membranes.

    View details for DOI 10.1016/j.chembiol.2012.11.007

    View details for Web of Science ID 000315978600009

    View details for PubMedID 23438746

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