Informace o publikaci

Quantitative proteomics of the tobacco pollen tube secretome identifies novel pollen tube guidance proteins important for fertilization

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SAID Hafidh POTĚŠIL David FÍLA Jan ČAPKOVÁ Věra ZDRÁHAL Zbyněk HONYS David

Rok publikování 2016
Druh Článek v odborném periodiku
Časopis / Zdroj Genome Biology
Fakulta / Pracoviště MU

Středoevropský technologický institut

Citace
www http://genomebiology.biomedcentral.com/articles/10.1186/s13059-016-0928-x
Doi http://dx.doi.org/10.1186/s13059-016-0928-x
Obor Botanika
Klíčová slova Protein secretion; Pollen tube guidance; Cell-cell signaling; Double fertilization
Popis We performed genome-wide quantitative liquid chromatography-tandem mass spectrometry analysis of a pistil-stimulated pollen tube secretome and identified 801 pollen tube-secreted proteins. Interestingly, in silico analysis reveals that the pollen tube secretome is dominated by proteins that are secreted unconventionally, representing 57 % of the total secretome. In support, we show that an unconventionally secreted protein, translationally controlled tumor protein, is secreted to the apoplast. Remarkably, we discovered that this protein could be secreted by infiltrating through the initial phases of the conventional secretory pathway and could reach the apoplast via exosomes, as demonstrated by co-localization with Oleisin1 exosome marker. We demonstrate that translationally controlled tumor protein-knockdown Arabidopsis thaliana plants produce pollen tubes that navigate poorly to the target ovule and that the mutant allele is poorly transmitted through the male. Further, we show that regulators of the endoplasmic reticulum-trans-Golgi network protein secretory pathway control secretion of Nicotiana tabacum Pollen tube-secreted cysteine-rich protein 2 and Lorelei-like GPI-anchor protein 3 and that a regulator of endoplasmic reticulum-trans-Golgi protein translocation is essential for pollen tube growth, pollen tube guidance and ovule-targeting competence.
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