A trio of Arabidopsis proteins acts as the executor complex in the pollen aperture formation program

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ID: 316403
2026
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Abstract
Pollen apertures are specialized sites on the pollen surface that have little to no pollen wall exine and their numbers, positions, and morphology are species specific. Apertures have become a useful model for studying how cells develop distinct plasma membrane (PM) domains. During pollen development, these sites recruit specific factors and become protected from exine deposition. However, the molecular mechanisms underlying this process and the identities of the associated aperture factors remain poorly understood. Previous studies identified two Arabidopsis (Arabidopsis thaliana) proteins, INAPERTURATE POLLEN 1 (INP1) and the non-paralogous INP2, as essential for aperture formation and showed that they form a species-specific protein complex proposed to localize to the extracellular surface of the aperture PM domains. In this study, we identified STRUBBELIG RECEPTOR FAMILY 2 (SRF2), a receptor-like pseudokinase that spans the PM, as another factor required for pollen aperture formation in Arabidopsis. SRF2 shares key features with INP1 and INP2, including mutant phenotype, expression pattern, localization to aperture PM domains, genetic interactions, and evolutionary trends. We present evidence that the extracellular domain of SRF2 interacts with INP2, and that these three proteins form a complex essential for executing the aperture formation program, with properties that differ among species.
Reference Key
openalex_W7163867363 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Yuan Zhou, Crystal Finzer, Prativa Amom, Michelle Tan, Emili Toppari, Mia Scott, Jay Huang, Sarah H. Reeder, Anna A. Dobritsa
Journal The Plant cell
Year 2026
DOI
10.1093/plcell/koag163
URL
https://doi.org/10.1093/plcell/koag163
Keywords Keywords not found

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