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• W2937954906 abstract "Tip growth of pollen tubes, root hairs and apical cells of moss protonemata is controlled by ROP (Rho of plants) GTPases, which were shown to accumulate at the apical plasma membrane of these cells. However, most ROP localization patterns reported in the literature are based on fluorescent protein tagging and need to be interpreted with caution, as ROP fusion proteins were generally overexpressed at undefined levels, commonly without assessing effects on tip growth. ROP-GEFs, important regulators of ROP activity, were also described to accumulate at the apical plasma membrane during tip growth. However, to date only the localization of fluorescent ROP-GEF fusion proteins strongly overexpressed using highly active promoters have been investigated. Here, the intracellular distributions of fluorescent PpROP1 and PpROP-GEF4 fusion proteins expressed at essentially endogenous levels in apical cells of Physcomitrella patens “knock-in” protonemata were analyzed. Whereas PpROP-GEF4 was found to associate with a small apical plasma membrane domain, PpROP1 expression was below the detection limit. Estradiol-titratable expression of a fluorescent PpROP1 fusion protein at the lowest detectable level, at which plant development was only marginally affected, was therefore employed to show that PpROP1 also accumulates at the apical plasma membrane, although within a substantially larger domain. Interestingly, RNAseq data established that roughly 85% of all genes active in protonemata are expressed at lower levels than PpROP1, indicating that estradiol-titratable expression rather than “knock-in” is the method of choice to investigate the intracellular distribution of most protonemal proteins based on fluorescent protein tagging." @default.
• W2937954906 created "2019-04-25" @default.
• W2937954906 creator A5025914655 @default.
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• W2937954906 date "2019-04-12" @default.
• W2937954906 modified "2023-09-23" @default.
• W2937954906 title "Analysis of the Localization of Fluorescent PpROP1 and PpROP-GEF4 Fusion Proteins in Moss Protonemata Based on Genomic “Knock-In” and Estradiol-Titratable Expression" @default.
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• W2937954906 doi "https://doi.org/10.3389/fpls.2019.00456" @default.
• W2937954906 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6473103" @default.
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