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The RING-Type Ubiquitin Ligase XBAT35.2 Positively Modulates Plant Immunity by Promoting FLS2 Protein Accumulation.

Yi Zhang1, Chaofeng Wang1, Bangjun Zhou1

  • 1Center for Plant Science Innovation and Department of Plant Pathology, University of Nebraska, Lincoln, NE 68588, U.S.A.

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Summary
This summary is machine-generated.

The plant immune receptor FLS2

Keywords:
Pseudomonas syringae pv. tomatoXBAT35.2 E3 ligaseankyrin repeat domainflagellin-sensing 2 (FLS2)pattern-triggered immunityubiquitination

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Area of Science:

  • Plant immunity
  • Molecular plant pathology
  • Cell biology

Background:

  • Pattern-triggered immunity (PTI) is a crucial plant defense mechanism.
  • FLAGELLIN-SENSING 2 (FLS2) recognizes bacterial flagellin and is vital for plant defense.
  • XBAT35 is an Arabidopsis E3 ubiquitin ligase family with an Ankyrin-repeat (ANK)-RING domain.

Purpose of the Study:

  • To investigate the role of Arabidopsis ubiquitin ligase XBAT35.2 in FLS2-mediated pattern-triggered immunity (PTI).
  • To elucidate the mechanism by which XBAT35.2 regulates FLS2 protein stability and plant defense responses.

Main Methods:

  • Investigated the function of XBAT35.2 isoforms in plant immunity against Pseudomonas syringae pv. tomato DC3000.
  • Analyzed FLS2 protein accumulation and degradation in wild-type and mutant Arabidopsis.
  • Determined XBAT35.2 localization and interactions with FLS2, BAK1, and BIK1 using in vivo and in vitro assays.

Main Results:

  • XBAT35.2 positively regulates FLS2-mediated PTI by enhancing FLS2 protein stability.
  • Overexpression of XBAT35.2 increases FLS2 levels, while the xbat35 null mutant shows enhanced FLS2 degradation.
  • XBAT35.2 localizes to the plasma membrane and Golgi, interacting with FLS2 and BAK1, and modulates these interactions upon flg22 treatment.

Conclusions:

  • XBAT35.2 plays a key role in plant PTI by stabilizing the FLS2 receptor, likely without direct ubiquitination.
  • XBAT35.2 facilitates early FLS2-mediated immune signaling, contributing to robust plant defense against bacterial pathogens.