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proteinase/pomme de terre
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Structure and folding of potato type II proteinase inhibitors: circular permutation and intramolecular domain swapping.
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Potato type II serine proteinase inhibitors are proteins that consist of multiple sequence repeats, and exhibit a multidomain structure. The structural domains are circular permutations of the repeat sequence, as a result of intramolecular domain swapping. Structural studies give indications for the
Potato leafroll virus protein P1 contains a serine proteinase domain.
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The multi-domain potato leafroll virus replicase protein P1 was expressed in insect cells from the polyhedrin promoter of Autographa californica nucleopolyhedrovirus. Using antisera raised against P1, it was shown that P1 was cleaved near the VPg in insect cells in a manner similar to that in plant
[Interaction of protein inhibitor from potato (protein with pI 7.3) with proteinases].
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The interaction between protein inhibitor of serine proteinases from potato (protein with pI 7.3) and enzymes was investigated. The main complex present in mixtures of the inhibitor with trypsin, chymotrypsin or subtilisin contained one dimeric inhibitor molecule and one molecule of either enzyme.
Antisense-mediated depletion of a potato lipoxygenase reduces wound induction of proteinase inhibitors and increases weight gain of insect pests.
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De novo jasmonic acid (JA) synthesis is required for wound-induced expression of proteinase inhibitors and other defense genes in potato and tomato. The first step in JA biosynthesis involves lipoxygenase (LOX) introducing molecular oxygen at the C-13 position of linolenic acid. We previously have
Wound-inducible nuclear protein binds DNA fragments that regulate a proteinase inhibitor II gene from potato.
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Deletion analysis from the 3' to the 5' end of the promoter region of the wound-inducible potato proteinase inhibitor IIK gene has identified a 421-base sequence at -136 to -557 that is necessary for expression. Utilizing DNA band-shift assays, a 10-base sequence within the 421-base region was found
Identification of potato nuclear proteins binding to the distal promoter region of the proteinase inhibitor II gene.
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Potato nuclear proteins specifically bind to a DNA sequence at the most 5' distal region of the promoter of a potato proteinase inhibitor II gene. Binding studies using the electrophoretic mobility-shift assay showed the appearance of two protein-DNA complexes in the presence of both tuber and leaf
Inhibition of cysteine proteinases by a protein inhibitor from potato.
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The inhibitory specificity of a protein from potato tubers that inhibits cysteine proteinases (potato cysteine proteinase inhibitor, PCPI) has been compared with that of chicken egg-white cystatin. Most proteinases that are inhibited by cystatin were also inhibited by PCPI, but the potato inhibitor
Inhibition of Colorado potato beetle larvae by a locust proteinase inhibitor peptide expressed in potato.
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The cDNA for a 73-mer peptide containing two locust serine proteinase inhibitors was cloned, fused to the constitutive CaMV35S promoter and introduced into potato by Agrobacterium-mediated transformation. From 23 independent transgenic lines, three with high mRNA level and proteinase inhibitory
Amino acid sequence of an active fragment of potato proteinase inhibitor IIa.
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The complete amino acid sequence of an active fragment of potato proteinase inhibitor IIa has been established by the Edman degradation procedure and the carboxypeptidase technique. Sequence analyses were carried out on the reduced and carboxymethylated active fragment and its tryptic peptides. To
Aspartic proteinase inhibitors from tomato and potato are more potent against yeast proteinase A than cathepsin D.
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The interaction of a variety of aspartic proteinases with a recombinant tomato protein produced in Pichia pastoris was investigated. Only human cathepsin D and, even more potently, proteinase A from Saccharomyces cerevisiae were inhibited. The tomato polypeptide has >80% sequence identity to a
Structure of the complex of Streptomyces griseus proteinase B and polypeptide chymotrypsin inhibitor-1 from Russet Burbank potato tubers at 2.1 A resolution.
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A low molecular weight protein inhibitor of serine proteinases from Russet Burbank potato tubers, polypeptide chymotrypsin inhibitor-1 (PCI-1), has been crystallized in complex with Streptomyces griseus proteinase B (SGPB). The three-dimensional structure of the complex has been solved at 2.1 A
Biotin-labeled potato chymotrypsin inhibitor-1: a useful probe for the detection and quantitation of chymotrypsin-like serine proteinases on western blots and its application in the detection of a serine proteinase synthesised by articular chondrocytes.
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Potato chymotrypsin inhibitor-1 (pCTI-1) was biotinylated by reaction with sulfosuccinimidyl-6-(biotinamido)hexanoate. This derivative was used as a probe on Western blots for the detection and quantitation of chymotrypsin and the detection of a chymotrypsin-like serine proteinase synthesized by
Isolation of a low molecular weight active fragment of potato proteinase inhibitor IIb.
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A low molecular weight active fragment of potato proteinase inhibitor IIPB was obtained by incubating the inhibitor with an equimolar amount of trypsin [EC 3.4.21.4] at pH 8 and 30 degrees for 16 hr, followed by gel filtration through Sephadex G-50, treatment with trichloroacetic acid, and
Reactive sites of the 21-kD protein inhibitor of serine proteinases from potato tubers.
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The effect of modifications of Met, Arg, and Lys residues on the inhibitory activity of a serine proteinase-inhibiting 21-kD protein from potato tubers has been studied. The data indicate that the 21-kD protein has two independent reactive sites for human leukocyte elastase (or chymotrypsin) and
Selective loss of cysteine residues and disulphide bonds in a potato proteinase inhibitor II family.
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Disulphide bonds between cysteine residues in proteins play a key role in protein folding, stability, and function. Loss of a disulphide bond is often associated with functional differentiation of the protein. The evolution of disulphide bonds is still actively debated; analysis of naturally
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