作者: Ancilla Neu , Emily Eilbert , Lisa Y. Asseck , Daniel Slane , Agnes Henschen
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摘要: In flowering plants, the asymmetrical division of zygote is first hallmark apical-basal polarity embryo and controlled by a MAP kinase pathway that includes MAPKKK YODA (YDA). Arabidopsis, YDA activated membrane-associated pseudokinase SHORT SUSPENSOR (SSP) through an unusual parent-of-origin effect: SSP transcripts accumulate specifically in sperm cells but are translationally silent. Only after fertilization protein transiently produced zygote, presumably from paternally inherited transcripts. recently diverged, Brassicaceae-specific member BRASSINOSTEROID SIGNALING KINASE (BSK) family. BSK proteins typically play broadly overlapping roles as receptor-associated signaling partners various receptor pathways involved growth innate immunity. This raises two questions: How did with generic function signal relay acquire property signal-like patterning cue, how early process plants outside Brassicaceae family, where orthologs absent? Here, we show Arabidopsis BSK1 BSK2, close paralogs conserved several YDA-dependent events, including embryogenesis. However, contribution to activation does not overlap contributions BSK2. The loss intramolecular regulatory interaction enables constitutively activate pathway, thus initiates soon translated without necessity invoking canonical activation.