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DTSTAMP:20260424T113939Z
UID:1740992400@ist.ac.at
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DESCRIPTION:Speaker: Aline Monzer\nhosted by Mario de Bono\nAbstract: Plant
  growth and development rely significantly on phytohormones\, with auxin s
 erving as a master regulator\, orchestrating processes from embryogenesis 
 to organogenesis\, vascular patterning\, and environmental adaptation. Sin
 ce its conceptual proposition by Charles Darwin in 1880 as an endogenous c
 hemical signal influencing phototropism in grass\, auxin has captivated sc
 ientists seeking to understand how such a small molecule exerts a profound
  influence on plant development.One particularly fascinating aspect of aux
 in function is its ability to self-organize its transport. Through a feedb
 ack mechanism between auxin perception and directional transport—primari
 ly mediated by PIN auxin transporters—auxin establishes narrow transport
  channels. This phenomenon\, known as auxin canalization\, is fundamental 
 to vascular formation\, regeneration\, and other key developmental process
 es. Despite advances in our understanding\, driven by experimental studies
  and computational models\, auxin canalization remains an enigma\, with ma
 ny unanswered questions.Like other hormones\, auxin functions through intr
 icate signaling pathways. It operates through at least two distinct signal
 ing mechanisms: the well-characterized canonical pathway and the less unde
 rstood non-canonical pathway. While significant progress has been made in 
 elucidating the canonical pathway\, the non-canonical mechanisms remain le
 ss defined and require further investigation.In this study\, we revisit th
 e non-canonical auxin signaling pathway mediated by the cell-surface compl
 ex Auxin Binding Protein 1-Transmembrane Kinase 1 (ABP1-TMK1)\, with a par
 ticular focus on its downstream phosphorylation events. We reveal that thi
 s auxin-mediated phosphorylation is conserved across the green lineage\, u
 nderscoring its fundamental role in plant development. We explore key phos
 phorylation targets\, particularly PIN2\, which is essential for root grav
 itropism. To further understand TMK1’s role in diverse developmental pro
 cesses\, we identified and investigated its interactors as potential co-re
 ceptors or regulatory components within its signaling network.Given the pr
 eviously established role of ABP1-TMK1 in auxin canalization\, we sought t
 o further investigate this process and identified several TMK1 interactors
  also involved in this intricate mechanism.These findings provide new insi
 ghts into the complex regulation of auxin canalization\, highlighting a br
 oader and more interconnected signaling framework than previously understo
 od. 
LOCATION:Central Bldg / O1 / Ballroom (I01.O1.006) and Zoom\, ISTA
ORGANIZER:
SUMMARY:Aline Monzer: Thesis Defense:Cell-Surface Auxin Signaling: Linking 
 molecular pathways to plant development 
URL:https://talks-calendar.ista.ac.at/events/5568
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