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13 resultados
Cell Ablation Reveals That Expression from the Phaseolin Promoter Is Confined to Embryogenesis and Microsporogenesis.
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Most previous studies of the [beta]-phaseolin (phas) gene, which encodes the major storage protein in bean (Phaseolus vulgaris L.), have shown its expression to be rigorously confined to the developing seed, both in bean and transgenic tobacco (Nicotiana tabacum L. cv Xanthi) plants. To confirm
Degradation of transport-competent destabilized phaseolin with a signal for retention in the endoplasmic reticulum occurs in the vacuole.
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To understand how plant cells exert quality control over the proteins that pass through the secretory system we examined the transport and accumulation of the bean (Phaseolus vulgaris L.) vacuolar storage protein phaseolin, structurally modified to contain a helix-breaking epitope and
A 68 bp element of the beta-phaseolin promoter functions as a seed-specific enhancer.
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In beans, expression of the beta-phaseolin gene (phas), encoding the major seed storage protein of bean (Phaseolus vulgaris) is confined to the cotyledons of developing embryos. Phaseolin has not been detected in the endosperm, which remains liquid and is lost early in development. However, fusion
Zeolin. A new recombinant storage protein constructed using maize gamma-zein and bean phaseolin.
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The major seed storage proteins of maize (Zea mays) and bean (Phaseolus vulgaris), zein and phaseolin, accumulate in the endoplasmic reticulum (ER) and in storage vacuoles, respectively. We show here that a chimeric protein composed of phaseolin and 89 amino acids of gamma-zein, including the
Retention of a bean phaseolin/maize gamma-Zein fusion in the endoplasmic reticulum depends on disulfide bond formation.
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Most seed storage proteins of the prolamin class accumulate in the endoplasmic reticulum (ER) as large insoluble polymers termed protein bodies (PBs), through mechanisms that are still poorly understood. We previously showed that a fusion between the Phaseolus vulgaris vacuolar storage protein
Recognition efficiency of Dicotyledoneae-specific promoter and RNA processing signals in rice.
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Heterologous gene expression experiments have shown that genes of Monocotyledoneae are often not transcribed in Dicotyledoneae, or produce pre-mRNA that is inefficiently or aberrantly processed. It is however not known how correctly and efficiently dicotyledon-specific gene expression signals are
Phenotypic Changes in Transgenic Tobacco Plants Overexpressing Vacuole-Targeted Thermotoga maritima BglB Related to Elevated Levels of Liberated Hormones.
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The hyperthermostable β-glucosidase BglB of Thermotoga maritima was modified by adding a short C-terminal tetrapeptide (AFVY, which transports phaseolin to the vacuole, to its C-terminal sequence). The modified β-glucosidase BglB was transformed into tobacco (Nicotiana tabacum L.) plants. We
Accumulation of 15-Kilodalton Zein in Novel Protein Bodies in Transgenic Tobacco.
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Zeins, the seed storage proteins of maize, are a group of alcohol-soluble polypeptides of different molecular masses that share a similar amino acid composition but vary in their sulfur amino acid composition. They are synthesized on the rough endoplasmic reticulum (ER) in the endosperm and are
The human immunodeficiency virus antigen Nef forms protein bodies in leaves of transgenic tobacco when fused to zeolin.
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Protein bodies (PB) are stable polymers naturally formed by certain seed storage proteins within the endoplasmic reticulum (ER). The human immunodeficiency virus negative factor (Nef) protein, a potential antigen for the development of an anti-viral vaccine, is highly unstable when introduced into
The C-terminal HDEL sequence is sufficient for retention of secretory proteins in the endoplasmic reticulum (ER) but promotes vacuolar targeting of proteins that escape the ER.
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Proteins are co-translationally transferred into the endoplasmic reticulum (ER) and then either retained or transported to different intracellular compartments or to the extracellular space. Various molecular signals necessary for retention in the ER or targeting to different compartments have been
Identification of the protein storage vacuole and protein targeting to the vacuole in leaf cells of three plant species.
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Protein storage vacuoles (PSVs) are specialized vacuoles devoted to the accumulation of large amounts of protein in the storage tissues of plants. In this study, we investigated the presence of the storage vacuole and protein trafficking to the compartment in cells of tobacco (Nicotiana tabacum),
Cre recombinase expression can result in phenotypic aberrations in plants.
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The cre recombinase gene was stably introduced and expressed in tomato, petunia and Nicotiana tabacum. Some plants expressing the cre gene driven by a CaMV 35S promoter displayed growth retardation and a distinct pattern of chlorosis in their leaves. Although no direct relation can be proven between
Seed-specific gene activation mediated by the Cre/lox site-specific recombination system.
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The Cre/lox site-specific recombination system was used to activate a transgene in a tissue-specific manner. Cre-mediated activation of a beta-glucuronidase marker gene, by removal of a lox-bounded blocking fragment, allowed the visualization of the activation process. By using seed-specific
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