Family In Transit
Mostrando 13-24 de 58 artigos, teses e dissertações.
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13. Maize mitochondrial manganese superoxide dismutases are encoded by a differentially expressed multigene family.
We have isolated maize cDNAs encoding three manganese-containing superoxide dismutases (MnSODs) distinct from the one previously reported. Molecular analyses indicate that multiple MnSOD transcripts are encoded by different, though similar, genes in the maize genome. A single MnSOD gene has been reported in all other organisms examined to date. The deduced a
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14. rbcS genes in Solanum tuberosum: conservation of transit peptide and exon shuffling during evolution.
Five genes of the rbcS gene family of Solanum tuberosum (potato) were studied. One of these is a cDNA clone; the other four are located on two genomic clones representing two different chromosomal loci containing one (locus 1) and three genes (locus 2), respectively. The intron/exon structure of the three genes in locus 2 is highly conserved with respect to
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15. A Chloroplast Phosphate Transporter, PHT2;1, Influences Allocation of Phosphate within the Plant and Phosphate-Starvation Responses
The uptake and distribution of Pi in plants requires multiple Pi transport systems that must function in concert to maintain homeostasis throughout growth and development. The Pi transporter PHT2;1 of Arabidopsis shares similarity with members of the Pi transporter family, which includes Na+/Pi symporters of fungal and animal origin and H+/Pi symporters of b
American Society of Plant Biologists.
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16. Periplasmic Transit and Disulfide Bond Formation of the Autotransported Shigella Protein IcsA
The Shigella outer membrane protein IcsA belongs to the family of type V secreted (autotransported) virulence factors. Members of this family mediate their own translocation across the bacterial outer membrane: the carboxy-terminal β domain forms a β barrel channel in the outer membrane through which the amino-terminal α domain passes. IcsA, which is loca
American Society for Microbiology.
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17. Identification of a maize nucleic acid-binding protein (NBP) belonging to a family of nuclear-encoded chloroplast proteins.
A cDNA encoding a nuclear-encoded chloroplast nucleic acid-binding protein (NBP) has been isolated from maize. Identified as an in vitro DNA-binding activity, NBP belongs to a family of nuclear-encoded chloroplast proteins which share a common domain structure and are thought to be involved in posttranscriptional regulation of chloroplast gene expression. NB
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18. A novel signal recognition particle targets light-harvesting proteins to the thylakoid membranes
The mechanisms involved in the posttranslational targeting of membrane proteins are not well understood. The light-harvesting chlorophyll proteins (LHCP) of the thylakoid membrane are a large family of hydrophobic proteins that are targeted in this manner. They are synthesized in the cytoplasm, translocated across the chloroplast envelope membranes into the
The National Academy of Sciences.
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19. Organ-specific transcripts of different size and abundance derive from the same pyruvate, orthophosphate dikinase gene in maize.
Analyses of genomic DNA and clones indicate that the pyruvate, orthophosphate dikinase (PPDK; ATP: pyruvate, orthophosphate phosphotransferase, EC 2.7.9.1) gene family of maize (Zea mays L. subsp. mays, line B73) contains two members. Restriction site and DNA sequence comparisons between PPDK genomic and leaf cDNA clones have revealed which gene encodes the
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20. A chloroplast processing enzyme involved in precursor maturation shares a zinc-binding motif with a recently recognized family of metalloendopeptidases.
Nuclear-encoded proteins targeted to the chloroplast are typically synthesized with N-terminal transit peptides which are proteolytically removed upon import. Structurally related proteins of 145 and 143 kDa copurify with a soluble chloroplast processing enzyme (CPE) that cleaves the precursor for the major light-harvesting chlorophyll a/b binding protein an
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21. The Arabidopsis HY2 Gene Encodes Phytochromobilin Synthase, a Ferredoxin-Dependent Biliverdin Reductase
Light perception by the plant photoreceptor phytochrome requires the tetrapyrrole chromophore phytochromobilin (PΦB), which is covalently attached to a large apoprotein. Arabidopsis mutants hy1 and hy2, which are defective in PΦB biosynthesis, display altered responses to light due to a deficiency in photoactive phytochrome. Here, we describe the isolation
American Society of Plant Physiologists.
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22. Characterisation of three cDNA clones encoding different mRNAs for the precursor to the small subunit of wheat ribulosebisphosphate carboxylase.
We have isolated and sequenced three cDNA clones for the nuclear-encoded precursor to the small subunit of the chloroplast enzyme, ribulose-1,5-bisphosphate carboxylase of wheat. The nucleotide sequences of these clones are different, indicating that they are probably derived from three different mRNAs. This finding is consistent with the proposal that this
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23. Combinatorial roles for pRB, p107, and p130 in E2F-mediated cell cycle control
Numerous studies have implicated the pRB family of nuclear proteins in the control of cell cycle progression. Although over-expression experiments have revealed that each of these proteins, pRB, p107, and p130, can induce a G1 cell cycle arrest, mouse knockouts demonstrated distinct developmental requirements for these proteins, as well as partial funct
The National Academy of Sciences.
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24. Expression during Salt Stress and Nucleotide Sequence of cDNA for Ferredoxin-NADP+ Reductase from Mesembryanthemum crystallinum1
In the facultative halophyte Mesembryanthemum crystallinum (common ice plant) the enzyme ferredoxin-NADP+-reductase (FNR) is coded for by a small family of 2 to 3 genes. We have determined the expression characteristics as the plants adapt to high salt and the nucleotide sequence of a full-length cDNA coding for the precursor of this chloroplast-located enzy