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hydroxyproline/arabidopsis thaliana
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Hydroxyproline O-arabinosyltransferase mutants oppositely alter tip growth in Arabidopsis thaliana and Physcomitrella patens.
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Hydroxyproline O-arabinosyltransferases (HPATs) are members of a small, deeply conserved family of plant-specific glycosyltransferases that add arabinose sugars to diverse proteins including cell wall-associated extensins and small signaling peptides. Recent genetic studies in flowering plants
Identification of three hydroxyproline O-arabinosyltransferases in Arabidopsis thaliana.
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Hydroxyproline (Hyp) O-arabinosylation is a post-translational modification that is prominent in extracellular glycoproteins in plants. Hyp O-arabinosylation is generally found in these glycoproteins in the form of linear oligoarabinoside chains and has a key role in their function by contributing
Glycosides of hydroxyproline: some recent, unusual discoveries.
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Glycosides of hydroxyproline (Hyp) in the plant cell wall matrix were discovered by Lamport and co-workers in the 1960s. Since then, much has been learned about these Hyp-rich glycoproteins. The intent of this review was to compare and contrast some less common structural motifs, in nontraditional
Characterization of four extensin genes in Arabidopsis thaliana by differential gene expression under stress and non-stress conditions.
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From Arabidopsis thaliana we isolated four different cDNAs that encode extensins, a family of cell-wall hydroxyproline-rich glycoproteins (HRGPs). Putative proteins (AtExt2-5) contained one open reading frame and characteristic Ser-(Pro)4 sequences organized in a high-order repetitive motif.
Characterization of the arabinogalactan protein 31 (AGP31) of Arabidopsis thaliana: new advances on the Hyp-O-glycosylation of the Pro-rich domain.
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Proteins are important actors in plant cell walls because they contribute to their architecture and their dynamics. Among them, hydroxyproline (Hyp)-rich glycoproteins constitute a complex family of O-glycoproteins with various structures and functions. In this study, we characterized an atypical
Regulation of cell length in the Arabidopsis thaliana root by the ethylene precursor 1-aminocyclopropane- 1-carboxylic acid: a matter of apoplastic reactions.
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Treatment of the Arabidopsis thaliana root with the ethylene precursor 1-aminocyclopropane-1-carboxylic acid (ACC) immediately imposes a reduced maximal cell length beyond which further elongation is blocked. Here, we investigated possible apoplastic reactions involved in the inhibition of cell
Characterization of endoplasmic reticulum-localized UDP-D-galactose: hydroxyproline O-galactosyltransferase using synthetic peptide substrates in Arabidopsis.
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We characterized peptidyl hydroxyproline (Hyp) O-galactosyltransferase (HGT), which is the initial enzyme in the arabinogalactan biosynthetic pathway. An in vitro assay of HGT activity was established using chemically synthesized fluorescent peptides as acceptor substrates and extracts from
Characterization of a second Arabidopsis thaliana prolyl 4-hydroxylase with distinct substrate specificity.
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4-Hydroxyproline is found in collagens, collagen-like proteins, elastin, and the hypoxia-inducible transcription factor in animals and in many hydroxyproline-rich glycoproteins in plants. We report here on the cloning and characterization of a second plant P4H (prolyl 4-hydroxylase), At-P4H-2, from
Cloning and characterization of a low molecular weight prolyl 4-hydroxylase from Arabidopsis thaliana. Effective hydroxylation of proline-rich, collagen-like, and hypoxia-inducible transcription factor alpha-like peptides.
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4-Hydroxyproline is found in collagens and collagen-like proteins in animals and in many glycoproteins in plants. Animal prolyl 4-hydroxylases (P4Hs) have been cloned and characterized from many sources, but no plant P4H has been cloned so far. We report here that the genome of Arabidopsis thaliana
Characterization of synthetic hydroxyproline-rich proteoglycans with arabinogalactan protein and extensin motifs in Arabidopsis.
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A series of gene constructs encoding synthetic glycomodule peptides with N-terminal signal sequences and C-terminal green fluorescent proteins were expressed in transgenic Arabidopsis (Arabidopsis thaliana) under the control of the 35S promoter. The synthetic glycomodule peptides were composed of
Structural analysis of linear hydroxyproline-bound O-glycans of Chlamydomonas reinhardtii--conservation of the inner core in Chlamydomonas and land plants.
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Linear hydroxyproline-bound O-glycans of the unicellular green alga Chlamydomonas reinhardtii were isolated from outer cell wall glycoproteins and their structure elucidated by chemical and spectroscopic methods. They consist exclusively of arabinose and galactose, the latter in the furanose form,
The hydroxyproline-rich glycoprotein domain of the Arabidopsis LRX1 requires Tyr for function but not for insolubilization in the cell wall.
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Extensins, hydroxyproline-rich repetitive glycoproteins with Ser-Hyp(4) motifs, are structural proteins in plant cell walls. The leucine-rich repeat extensin 1 (LRX1) of Arabidopsis thaliana is an extracellular protein with both a leucine-rich repeat and an extensin domain, and has been demonstrated
A bioinformatics approach to the identification, classification, and analysis of hydroxyproline-rich glycoproteins.
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Hydroxyproline-rich glycoproteins (HRGPs) are a superfamily of plant cell wall proteins that function in diverse aspects of plant growth and development. This superfamily consists of three members: hyperglycosylated arabinogalactan proteins (AGPs), moderately glycosylated extensins (EXTs), and
Arabinogalactan proteins as molecular markers in Arabidopsis thaliana sexual reproduction.
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Some of the most important changes that occur in plants during sexual reproduction involve the transition from a sporophytic to a gametophytic type of development. In this paper, these changes were evaluated for Arabidopsis thaliana. The results obtained clearly show differences in the pattern of
Arabidopsis thaliana RALF1 opposes brassinosteroid effects on root cell elongation and lateral root formation.
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Rapid alkalinization factor (RALF) is a peptide signal that plays a basic role in cell biology and most likely regulates cell expansion. In this study, transgenic Arabidopsis thaliana lines with high and low levels of AtRALF1 transcripts were used to investigate this peptide's mechanism of action.
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