ribonuclease/kartafla

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Purification of a ribonuclease from potato tubers and its use as an antigen in the immunochemical assay of this protein following tuber damage.

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A method for the purification of a ribonuclease from potato tubers is described. The preparation was free from deoxyribonuclease and phosphodiesterase activities and possessed only slight phosphomonoesterase activity. Specific antibodies against the ribonuclease preparation were raised in rabbits.

Changes in activity of lysosomal ribonuclease following mechanical damage to leaves of Solanum tuberosum L.

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Differential centrifugation experiments showed that the 13-fold increase in total acid ribonuclease (RNase) activity arising during the 48 h following mechanical damage to potato leaves was associated, in about equal proportions, with the sedimentable and supernatant fluid fractions of cell

Increase in ribonuclease activity following mechanical damage to leaf and tuber tissues of Solanum tuberosum L.

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Major increases occurred in the capacity of damaged potato leaf and tuber tissues to hydrolyse ribonucleic acid whilst relatively minor increases were found in the activity of acid phosphomonoesterase and acid phosphodiesterase. Partial purification of homogenates by gel filtration on Sephadex G-100

Transgenic potato expressing a double-stranded RNA-specific ribonuclease is resistant to potato spindle tuber viroid.

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We have produced transgenic potato lines expressing the yeast-derived double-stranded RNA-specific ribonuclease pac1. Five lines of pac1 potato (Solanum tuberosum L., cultivar Russet Burbank) challenged with potato spindle tuber viroid (PSTVd) suppressed PSTVd infection and accumulation. All of the

Studies on the primary and secondary structure of potato spindle tuber viroid: products of digestion with ribonuclease A and ribonuclease T1, and modification with bisulfite.

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Potato spindle tuber viroid (PSTV), a small infectios RNA, has been completely digested with RNase T1 and RNase A, and the resulting oligonucleotides have been sequenced using 5'-terminal 32p-labelling with gamma-32p ATP and T4 polynucleotide kinase, fingerprinting and controlled nuclease P1

Activation and de novo synthesis of ribonuclease following mechanical damage to leaves of Solanum tuberosum L.

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The pattern of changes in RNase activity in damaged potato leaves incubated in the presence of [(14)C]leucine followed closely that of leaves incubated in the absence of the radioisotope, but the levels of activity during time course experiments were consistently lower. Contributions of other

Separation of the infectious ribonucleic acid of potato spindle tuber virus from double-stranded ribonucleic acid of plant tissue extracts.

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The infectious ribonucleic acid (RNA) of potato spindle tuber virus (PSTV) can be separated by hydroxyapatite chromatography from double-stranded RNA detectable in low amounts in both infected and uninfected plant tissue extracts. The chromatographic behavior of ribonuclease-sensitive PSTV RNA

A cysteine protease gene is expressed early in resistant potato interactions with Phytophthora infestans.

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A potato cysteine protease (cyp) cDNA expressed at an early stage of an incompatible interaction with Phytophthora infestans was isolated. Both the nucleotide and deduced amino acid sequences are highly homologous to those of a tomato cysteine protease, CYP1. Striking protein similarity to all known

RNA progeny of an infectious two-base deletion cDNA mutant of potato spindle tuber viroid (PSTV) acquire two nucleotides in Planta.

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Deletion mutations were generated in four structural domains of a potato spindle tuber viroid (PSTV) complementary DNA (cDNA) clone. Deletions of 3 to 5 nucleotides at the central conserved domain (CCGGG, positions 94 to 98), variable domain (GCCG, positions 146 to 149) and pathogenicity domain

Isolation and properties of lysosomes from dark-grown potato shoots.

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A method is described for the isolation of lysosomal fractions from dark-grown potato shoots using a single stage separation on a Ficoll gradient. Peaks of acid hydrolase activity consisting of acid phosphatase, phosphodiesterase, ribonuclease, carboxylic esterase and β-glycerophosphatase were well

Ribonuclease T1 generates circular RNA molecules from viroid-specific RNA transcripts by cleavage and intramolecular ligation.

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A 406 nucleotide long potato spindle tuber viroid (PSTVd)-specific linear RNA transcript was synthesized in vitro and subjected to limited digestion with ribonuclease (RNase) T1. Under certain conditions this guanosine-specific endoribonuclease proved to be capable of processing the

Allelic diversity of S-RNase alleles in diploid potato species.

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CONCLUSIONS The S-ribonuclease sequences of 16 S-alleles derived from diploid types of Solanum are presented. A phylogenetic analysis and partial phenotypic analysis support the conclusion that these are functional S-alleles. S-Ribonucleases (S-RNases) control the pistil specificity of the

Determination of base specificity of multiple ribonucleases from crude samples.

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Ribonucleases are widely found on the tissues of living organisms, but the functions of individual ribonucleases are not clear. To facilitate characterization of individual ribonucleases, I have developed a rapid method to separate and identify each ribonuclease from a crude sample by gel

Structural relationship among the members of a multigene family coding for the sweet potato tuberous root storage protein.

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Sporamin, the major soluble protein of the sweet potato tuberous root, is coded for by a multigene family. Fourty-nine essentially full-length sporamin cDNAs isolated from tuberous root cDNA library have been classified by cross hybridization, restriction endonuclease cleavage pattern and

The effect of ribonuclease on the binding of calcium by mitochondria.

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Mitochondria, isolated from potato tuber, pretreated with ribonuclease (RNase) showed an increase in calcium binding at low enzyme concentration. The same dosage-response pattern was obtained whether the enzyme treatment was conducted for 10, 30 or 120 min. However, when the enzyme treatment was

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