<i>JAGGER</i>, an AGP essential for persistent synergid degeneration and polytubey block in Arabidopsis

Pereira, Ana Marta; Lopes, Ana Lúcia; Coimbra, Sı́lvia

doi:10.1080/15592324.2016.1209616

Cited by 27 publications

(11 citation statements)

References 34 publications

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“…How JAGGER is involved in this complex mechanism is still unknown. JAGGER might be one of the cell death markers for the persistent synergid nucleus, destining it for elimination (Pereira et al, 2016a). AGPs have already been described as molecular markers during development (Coimbra et al, 2007; Tucker and Koltunow, 2014).…”

Section: Pollen Tube Burst Sperm Cell Release and Polytubey Blockagmentioning

confidence: 99%

Arabinogalactan Proteins as Interactors along the Crosstalk between the Pollen Tube and the Female Tissues

2016

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Arabinogalactan proteins (AGPs) have long been considered to be implicated in several steps of the reproductive process of flowering plants. Pollen tube growth along the pistil tissues requires a multiplicity of signaling pathways to be activated and turned off precisely, at crucial timepoints, to guarantee successful fertilization and seed production. In the recent years, an outstanding effort has been made by the plant reproduction scientific community in order to better understand this process. This resulted in the discovery of a fairly substantial number of new players essential for reproduction, as well as their modes of action and interactions. Besides all the indications of AGPs involvement in reproduction, there were no convincing evidences about it. Recently, several studies came out to prove what had long been suggested about this complex family of glycoproteins. AGPs consist of a large family of hydroxyproline-rich proteins, predicted to be anchored to the plasma membrane and extremely rich in sugars. These two last characteristics always made them perfect candidates to be involved in signaling mechanisms, in several plant developmental processes. New findings finally relate AGPs to concrete functions in plant reproduction. In this review, it is intended not only to describe how different molecules and signaling pathways are functioning to achieve fertilization, but also to integrate the recent discoveries about AGPs along this process.

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Section: Pollen Tube Burst Sperm Cell Release and Polytubey Blockagmentioning

confidence: 99%

Arabinogalactan Proteins as Interactors along the Crosstalk between the Pollen Tube and the Female Tissues

2016

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“…Collectively, the functional characterization of HRGPs points toward their involvement in many processes within the wall, including signaling and cell wall integrity pathways (Costa et al, 2013;Pereira et al, 2015Pereira et al, , 2016Voxeur and Höfte, 2016). As plants evolved multicellularity and transitioned to land, it is likely that greater complexity in signaling networks was required, a role that could seemingly be fulfilled by HRGPs, due to their distinct protein and glycan characteristics.…”

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confidence: 99%

Insights into the Evolution of Hydroxyproline-Rich Glycoproteins from 1000 Plant Transcriptomes

et al. 2017

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The carbohydrate-rich cell walls of land plants and algae have been the focus of much interest given the value of cell wall-based products to our current and future economies. Hydroxyproline-rich glycoproteins (HRGPs), a major group of wall glycoproteins, play important roles in plant growth and development, yet little is known about how they have evolved in parallel with the polysaccharide components of walls. We investigate the origins and evolution of the HRGP superfamily, which is commonly divided into three major multigene families: the arabinogalactan proteins (AGPs), extensins (EXTs), and proline-rich proteins. Using motif and amino acid bias, a newly developed bioinformatics pipeline, we identified HRGPs in sequences from the 1000 Plants transcriptome project (www.onekp.com). Our analyses provide new insights into the evolution of HRGPs across major evolutionary milestones, including the transition to land and the early radiation of angiosperms. Significantly, data mining reveals the origin of glycosylphosphatidylinositol (GPI)-anchored AGPs in green algae and a 3-to 4-fold increase in GPI-AGPs in liverworts and mosses. The first detection of cross-linking (CL)-EXTs is observed in bryophytes, which suggests that CL-EXTs arose though the juxtaposition of preexisting SP n EXT glycomotifs with refined Y-based motifs. We also detected the loss of CL-EXT in a few lineages, including the grass family (Poaceae), that have a cell wall composition distinct from other monocots and eudicots. A key challenge in HRGP research is tracking individual HRGPs throughout evolution. Using the 1000 Plants output, we were able to find putative orthologs of Arabidopsis pollen-specific GPI-AGPs in basal eudicots.Cell walls of plants and algae are widely used for food, textiles, paper, and timber, yet our understanding of their assembly and dynamic remodeling in response to growth, development, and environmental stresses (abiotic and biotic) remains rudimentary (Doblin et al., 2010(Doblin et al., , 2014. There are two contrasting types of walls/extracellular matrices in the green plant lineage, protein-rich walls of some green algae and the cellulose-rich walls of embryophytes (land plants). Recent studies of cell wall evolution suggest that the origins of many wall components occurred in the streptophyte green algae prior to the evolution of embryophytes (Sørensen et al., 2010;Popper et al., 2011;Domozych et al., 2012) with elaboration of a preexisting set of polysaccharides rather than an entirely new polymer framework. Although both the ultrastructure of plant walls and the fine structure of their component polymers vary widely, they all typically constitute a fibrillar network of cellulose microfibrils that is embedded within a gel-like matrix of noncellulosic polysaccharides, pectins, 904

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“…One of them was GFP fused to arabinogalactan protein 4 (AGP4). Arabinogalactan proteins (AGPs) are cell surface proteoglycans that seem to be involved in diverse developmental processes such as differentiation, cell-cell recognition, embryogenesis and programmed cell death (Ellis et al, 2010; Pereira et al, 2016; Strasser et al, 2021). GFP-AGP4 has been shown previously to localize to the plasma membrane (Martinière et al, 2012; Bernat-Silvestre et al, 2020).…”

Section: Resultsmentioning

confidence: 99%

Function ofAtPGAP1in GPI anchor lipid remodeling and transport to the cell surface of GPI-anchored proteins

Bernat-Silvestre

Sánchez-Simarro

et al. 2021

Preprint

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GPI-anchored proteins (GPI-APs) play an important role in a variety of plant biological processes including growth, stress response, morphogenesis, signalling and cell wall biosynthesis. The GPI-anchor contains a lipid-linked glycan backbone that is synthesized in the endoplasmic reticulum (ER) where it is subsequently transferred to the C-terminus of proteins containing a GPI signal peptide by a GPI transamidase. Once the GPI anchor is attached to the protein, the glycan and lipid moieties are remodelled. In mammals and yeast, this remodelling is required for GPI-APs to be included in Coat Protein II (COPII) coated vesicles for their ER export and subsequent transport to the cell surface. The first reaction of lipid remodelling is the removal of the acyl chain from the inositol group by Bst1p (yeast) and PGAP1 (mammals). In this work, we have used a loss-of-function approach to study the role of PGAP1/Bst1 like genes in plants. We have found that Arabidopsis PGAP1 localizes to the ER and probably functions as the GPI inositol-deacylase which cleaves the acyl chain from the inositol ring of the GPI anchor. In addition, we show that PGAP1 function is required for efficient ER export and transport to the cell surface of GPI-APs.

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JAGGER, an AGP essential for persistent synergid degeneration and polytubey block in Arabidopsis

Cited by 27 publications

References 34 publications

Arabinogalactan Proteins as Interactors along the Crosstalk between the Pollen Tube and the Female Tissues

Arabinogalactan Proteins as Interactors along the Crosstalk between the Pollen Tube and the Female Tissues

Insights into the Evolution of Hydroxyproline-Rich Glycoproteins from 1000 Plant Transcriptomes

Function ofAtPGAP1in GPI anchor lipid remodeling and transport to the cell surface of GPI-anchored proteins

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