PubMed:15821023 JSONTXT

{"target":"https://pubannotation.org/docs/sourcedb/PubMed/sourceid/15821023","sourcedb":"PubMed","sourceid":"15821023","source_url":"http://www.ncbi.nlm.nih.gov/pubmed/15821023","text":"Involvement of alpha-amylase I-1 in starch degradation in rice chloroplasts.\nTo determine the role of alpha-amylase isoform I-1 in the degradation of starch in rice leaf chloroplasts, we generated a series of transgenic rice plants with suppressed expression or overexpression of alpha-amylase I-1. In the lines with suppressed expression of alpha-amylase I-1 at both the mRNA and protein levels, seed germination and seedling growth were markedly delayed in comparison with those in the wild-type plants. However, the growth retardation was overcome by supplementation of sugars. Interestingly, a significant increase of starch accumulation in the young leaf tissues was observed under a sugar-supplemented condition. In contrast, the starch content of leaves was reduced in the plants overexpressing alpha-amylase I-1. In immunocytochemical analysis with specific anti-alpha-amylase I-1 antiserum, immuno-gold particles deposited in the chloroplasts and extracellular space in young leaf cells. We further examined the expression and targeting of alpha-amylase I-1 fused with the green fluorescent protein in re-differentiated green cells, and showed that the fluorescence of the expressed fusion protein co-localized with the chlorophyll autofluorescence in the transgenic cells. In addition, mature protein species of alpha-amylase I-1 bearing an oligosaccharide side chain were detected in the isolated chloroplasts. Based on these results, we concluded that alpha-amylase I-1 targets the chloroplasts through the endoplasmic reticulum-Golgi system and plays a significant role in the starch degradation in rice leaves.","tracks":[{"project":"21k_plant_trait_mention","denotations":[{"id":"M_0","span":{"begin":736,"end":750},"obj":"TO:0000696, xzyao:2819"},{"id":"M_1","span":{"begin":649,"end":659},"obj":"xzyao:17707"},{"id":"M_2","span":{"begin":979,"end":989},"obj":"xzyao:17707"},{"id":"M_3","span":{"begin":165,"end":169},"obj":"PO:0025034, funRiceGene:469"},{"id":"M_4","span":{"begin":655,"end":659},"obj":"PO:0025034, funRiceGene:469"},{"id":"M_5","span":{"begin":985,"end":989},"obj":"PO:0025034, funRiceGene:469"},{"id":"M_6","span":{"begin":418,"end":426},"obj":"PO:0008037, funRiceGene:218"},{"id":"M_7","span":{"begin":418,"end":433},"obj":"funRiceGene:88, 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