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. 2019 Feb 4;20(3):672. doi: 10.3390/ijms20030672

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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The AvrPphB effector protease from P. syringae acts as a double sword in the plant response to bacterial infection. (A) After the recognition of flagellin by FLS2, AvrPphB degrades the botrytis-induced kinase 1 (BIK1) of the active receptor complex and blocks the pattern-triggered immunity (PTI) pathway [130,131]. (B) Alternatively, AvrPphB may cut the PBS1 protein, which is guarded by the RPS5 (resistance to Pseudomonas syringae 5) protein. RPS5 becomes activated and induces the effector-triggered immunity (ETI) response [134].