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BAK-up:the receptor kinase BAK-TO-LIFE 2 enhances immunity when BAK1 is lacking

Stress Biology 2023年第1期3卷 463-467页

作者： Vahid Fallahzadeh-Mamaghami Hannah Weber birgit kemmerling ZMBP University TubingenAuf der Morgenstelle 32Tübingen 72076Germany

BRI1-ASSOCIATED KINASE 1(BAK1/SERK3)and its closest homolog BAK1-LIKE 1(BKK1/SERK4)are leucine-rich repeat receptor kinases(LRR-RKs)belonging to the SOMATIC EMBRYOGENESIS RECEPTOR KINASE(SERK)*** act as co-receptors of various other LRR-RKs and participate in multiple signaling events by complexing and transphosphorylating ligand-binding *** identified as the brassinosteroid receptor BRASSINOSTEROID INSENSITIVE 1(BRI1)co-receptor,BAK1 also functions in plant immunity by interacting with pattern recognition *** in BAK1 and BKK1 cause severely stunted growth and cell death,characterized as autoimmune cell *** factors play a role in this type of cell death,including RKs and components of effector-triggered immunity(ETI)signaling pathways,glycosylation factors,ER quality control components,nuclear trafficking components,ion channels,and Nod-like receptors(NLRs).The Shan lab has recently discovered a novel RK BAK-TO-LIFE 2(BTL2)that interacts with BAK1 and triggers cell death in the absence of BAK1 and *** RK compensates for the loss of BAK1-mediated pattern-triggered immunity(PTI)by activating phytocytokine-mediated immune and cell death responses.

关键词： BAK1 Cell death Receptor kinase BTL2 PTI ETI

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Specifying the role of BAK1-interacting receptor-like kinase 3 in brassinosteroid signaling

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Journal of Integrative Plant Biology 2020年第4期62卷 456-469页

作者： Ruth Groβeholz Anna Feldman-Salit Friederike Wanke Sarina Schulze Nina Glockner birgit kemmerling Klaus Harter Ursula Kummer Centre for Organismal Studies/Bio Quant Heidelberg University69120 HeidelbergGermany Center for Plant Molecular Biology(ZMBP) University Tübingen72076 TubingenGermany

Brassinosteroids(BR) are involved in the control of several developmental processes ranging from root elongation to senescence and adaptation to environmental cues. Thus, BR perception and signaling have to be precisely regulated. One regulator is BRI1-associated kinase 1(BAK1)-interacting receptor-like kinase 3(BIR3). In the absence of BR, BIR3 forms complexes with BR insensitive 1(BRI1) and ***, the biophysical and energetic requirements for complex formation in the absence of the ligand have yet to be determined. Using computational modeling, we simulated the potential complexes between the cytoplasmic domains of BAK1, BRI1 and BIR3. Our calculations and experimental data confirm the interaction of BIR3 Rewith BAK1 and BRI1, with the BAK1 BIR3 interaction clearly favored. Furthermore, we demonstrate that BIR3 and BRI1 share the same interaction site with BAK1. This suggests a competition between BIR3 and BRI1 for binding to BAK1, which results in preferential binding of BIR3 to BAK1 in the absence of the ligand thereby preventing the active participation of BAK1 in BR signaling. Our model also suggests that BAK1 and BRI1 can interact even while BAK1 is in complex with BIR3 at an additional binding site of BAK1 that does not allow active BR signaling.

关键词： BAK1 interaction interacting

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Heat Shock Factors HsfB 1 and HsfB2b Are Involved in the Regulation of Pdf1.2 Expression and Pathogen Resistance in Arabidopsis

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Molecular Plant 2009年第1期2卷 152-165页

作者： Mukesh Kumar Wolfgang Busch Hannah Birke birgit kemmerling Thorsten Nurnberger Friedrich Schoffl Present address: Heinrich-Pette-lnstitut Martinistrabe 52 D-20251 Hamburg Germany Max-Planck-lnstitut fur Entwicklungsbiologie Abteilung Molekularbiologie Speemannstrabe 37-39 D-72076 Tubingen Germany Universitat Tubingen Zentrum for Molekularbiologie der Pflanzen (ZMBP)--AIIgemeine Genetik Auf der Morgenstelle 28 D-72076 Tubingen Germany Universitat Tubingen Zentrum fur Molekularbiologie der Pflanzen (ZMBP)--Biochemie der Pflanzen Auf der Morgenstelle 5 D-72076 Tubingen Germany

In order to assess the functional roles of heat stress-induced class B-heat shock factors in Arabidopsis, we investigated T-DNA knockout mutants of AtHsfB1 and AtHsfB2b. Micorarray analysis of double knockout hsfB1/hsfB2b plants revealed as strong an up-regulation of the basal mRNA-levels of the defensin genes Pdfl.2a/b in mutant plants. The Pdfexpression was further enhanced by jasmonic acid treatment or infection with the necrotrophic fungus Alternaria brassicicola. The single mutant hsfB2b and the double mutant hsfB 1/B2b were significantly improved in disease resistance after A. brassicicola infection. There was no indication for a direct interaction of Hsf with the promoter of Pdf1.2, which is devoid of perfect HSE consensus Hsf-binding sequences. However, changes in the formation of late HsfA2-dependent HSE binding were detected in hsfB1/B2b plants. This suggests that HsfB1/B2b may interact with class A-Hsf in regulating the shut-off of the heat shock response. The identification of Pdfgenes as targets of Hsf-dependent negative regulation is the first evidence for an interconnection of Hsf in the regulation of biotic and abiotic responses.

关键词： Abiotic/environmental stress transcriptional control and transcription factors transcriptome analysis defense responses disease resistance Arabidopsis.

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