Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: EC:3.1.25.1 (deoxyribonuclease)
 1,471 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

A deoxyribonuclease inhibitor has been purified from KB cells by chromatography on single-stranded DNA-cellulose. Polyacrylamide gel electrophoresis showed the purified preparation to contain two major polypeptides in sodium dodecyl sulfate, with molecular weights of 72,000 and 65,000, but only one major band (with a molecular weight of approximately 140,000) after electrophoresis under nondenaturing conditions. The protein inhibits the hydrolysis of single-stranded DNA by KB DNase, DNase I, DNase II, and nuclease S1, but has no effect on the hydrolysis of double-stranded DNA by these enzymes. The inhibitor causes a reduction in the rate of hydrolysis of DNA by the deoxyribonuclease, probably by reducing the effective concentration of substrate.
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PMID:A deoxyribonucleic acid binding protein from KB cells which inhibits deoxyribonuclease activity on single-stranded DNA. 42 57

5838-DNI, an inhibitor of deoxyribonuclease (DNase) II from porcine spleen was produced by Streptomyces sp. strain No. A-5838. The structure of 5838-DNI was shown to be 1,4,4a,5,12,12a-hexahydro-4,4a,11,12a-tetrahydroxy-3,8-dimethoxy-9- methoxycarbonyl-10-methyl-1,5,12-trioxo naphthacene. Although similar in structure to tetracenomycin C, which is an antibiotic against Gram-positive bacteria, 5838-DNI has different antibacterial activity. 5838-DNI was distinguished from 5923-DNI, a previously reported DNase II inhibitor, in inhibitory activity against each enzyme. 5838-DNI showed dependency of inhibition on pH and temperature, and inhibited phosphodiesterase I in a competitive manner. These data suggest that 5838-DNI is the first reported example of an inhibitor of microbial origin which is able to inhibit DNase II and phosphodiesterase I.
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PMID:5838-DNI, a deoxyribonuclease inhibitor produced by Streptomyces sp. strain no. A-5838. 128 32

To clarify the relationship between changes in serum pancreatic enzymes and pathological changes in pancreatic parenchyma, this study was performed by using rat models with acute pancreatitis. The models were rats with edematous and necrotizing pancreatitis. Amylase, lipase, ribonuclease (RNase), and deoxyribonuclease (DNase I, II) in the serum were determined for 48 h after the development of pancreatitis. Amylase and lipase levels rose directly in both pancreatitis groups. These enzymes in the necrotizing pancreatitis group were higher than those in the edematous pancreatitis group, but there was no significant difference. RNase levels also rose markedly, but there was no obvious difference between either of the pancreatitis groups. On the other hand, DNase levels were high in the necrotizing pancreatitis group but low in the edematous pancreatitis group, with significant differences between the two groups, especially in the DNase II levels over a 36-h period (p less than 0.05-0.01). Therefore, these results suggest that serum DNase levels reveal the necrotizing changes in pancreatic parenchyma.
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PMID:Relationship between pancreatic enzymes and pathological changes in the pancreas in acute pancreatitis. The significance of determination of serum deoxyribonuclease. 247 54

We have cloned and sequenced novel cDNAs that encode human and murine DNase II, the acidic deoxyribonuclease. Sequence analysis predicts that huDNase II contains an N-terminal signal sequence and that mature DNase II has 344 residues with a calculated molecular mass of 38 032 Da. DNase II is a novel enzyme with no homologies to proteins of known function. Surprisingly, C. elegans appears to possess a family of DNase II homologs. Unlike DNase I-like enzymes that have tissue-specific expression patterns, huDNase II is ubiquituously expressed at low levels. When huDNase II is expressed in human 293 cells, we observe secretion of a novel 42-44 kDa glycoprotein; approximately 20-30% of recombinant human DNase II activity is secreted in this system. The secreted enzyme possesses DNA hydrolytic activity and shares biochemical properties with purified DNase II obtained from other species. We also show that the mechanism by which DNase II cuts DNA is similar to DNase I in that the enzyme produces nicks rather than double-strand cuts.
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PMID:Molecular cloning and characterization of human and murine DNase II. 971 27

A deoxyribonuclease (DNase) which is active at acid pH in the absence of bivalent cations was found in loach spermatozoa. The enzyme was purified by ion-exchange chromatography and partially characterized. The DNase has optimal activity at pH 5.5 and its molecular weight is about 30 kD; its substrate is covalently closed circular duplex DNA, and its product is the corresponding unit-length linear DNA. The DNase is inhibited by MgCl2 and activated by EDTA. Thus, this endoDNase found in loach spermatozoa can be classified as a DNase II. The biological role of this DNase II is discussed.
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PMID:DNase II in spermatozoa of the loach misgurnus fossilis L 1038 8

DNase II is a well-known deoxyribonuclease (DNase) that catalyzes the hydrolysis of DNA into oligonucleotides under acidic conditions. We have identified a novel DNase that shows homology to DNase II, named DLAD, from a search of an expressed sequence tag data base. The full-length cDNA for rat DLAD cloned by polymerase chain reaction encodes a 356-amino acid polypeptide containing a putative N-terminal signal peptide and 5 potential N-glycosylation sites; there is a predicted catalytic domain resemblance to rat DNase II. The predicted DLAD translation product shares 32.9% identity with DNase II. Interestingly, expression of the DRAD mRNA is highly restricted to the liver. A Myc-His tagged recombinant DLAD recovered mainly from the cytoplasm of transfected HeLa S3 cells has a divalent cation-independent DNase activity. The DLAD activity prefers acidic conditions to neutral. The recombinant protein expressed in HeLa S3 cells inhibits the expression of GFP- and lac Z-expression vectors, suggesting that DLAD may play a role in elimination of exogenous DNA. Identification of the full-length cDNA for DLAD would lead to an understanding of the physiology of this DNase II-like molecule.
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PMID:Cloning of a cDNA encoding a rat DNase II-like acid DNase. 1055 78

Acidic endonuclease activity is present in all cells in the body and much of this can be attributed to the previously cloned and ubiquitously expressed deoxyribonuclease II (DNase II). Database analysis revealed the existence of expressed sequence tags and genomic segments coding for a protein with considerable homology to DNase II. This report describes the cloning of this cDNA, which we term deoxyribonuclease IIbeta (DNase IIbeta) and comparison of its expression to that of the originally cloned DNase II (now termed DNase IIalpha). The cDNA encodes a 357 amino acid protein. This protein exhibits extensive homology to DNase IIalpha including an amino-terminal signal peptide and a conserved active site, and has many of the regions of identity that are conserved in homologs in other mammals as well as C. elegans and Drosophila. The gene encoding DNase IIbeta has identical splice sites to DNase IIalpha. Human DNase IIbeta is highly expressed in the salivary gland, and at low levels in trachea, lung, prostate, lymph node, and testis, whereas DNase IIalpha is ubiquitously expressed in all tissues. The expression pattern of human DNase IIbeta suggests that it may function primarily as a secreted enzyme. Human saliva was found to contain DNase IIalpha, but after immunodepletion, considerable acid-active endonuclease remained which we presume is DNase IIbeta. We have localized the gene for human DNase IIbeta to chromosome 1p22.3 adjacent (and in opposing orientation) to the human uricase pseudogene. Interestingly, murine DNase IIbeta is highly expressed in the liver. Uricase is also highly expressed in mouse but not human liver and this may explain the difference in expression patterns between human and mouse DNase IIbeta.
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PMID:The cloning, genomic structure, localization, and expression of human deoxyribonuclease IIbeta. 1137 52

Nuclease footprinting techniques were initially developed to investigate protein-deoxyribonucleic acid (DNA) interactions but these tools of molecular biology have also become instrumental for probing sequence-selective binding of small molecules to DNA. Here, the method is described and technical details are given for performing deoxyribonuclease (DNase) I footprinting with DNA-binding drugs. An example is presented where DNase I is used (as well as DNase II and micrococcal nuclease) to probe the patterns of sequence-selective recognition of DNA by the anticancer antibiotic actinomycin D. DNase I is a convenient endonuclease for detecting and locating the position of actinomycin-binding sites within GC-rich sequences.
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PMID:DNase I footprinting of small molecule binding sites on DNA. 1533 13

A deoxyribonuclease (DNase) was isolated from viscera of the cold-adapted marine bivalve Icelandic scallop. The 42 kDa DNase was shown to be a single polypeptide which catalyses DNA hydrolysis in the absence of divalent cations. The isolated enzyme showed maximal activity at pH 6 and no activity above pH 7.2 against native DNA. The scallop DNase was slightly more susceptible to heat denaturation than porcine DNase II and makes double-strand breaks in circular DNA substrate as the porcine enzyme. The N-terminal sequence of the scallop DNase was shown to be closely similar to DNase II (EC 3.1.22.1) proteins from other organisms. The scallop DNase is in addition to plancitoxin I from A. planci, the only DNase II enzyme isolated from marine invertebrates.
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PMID:Deoxyribonuclease II from the Icelandic scallop (Chlamys islandica): isolation and partial characterization. 1642 84

We have developed two microtiter plate assays to quantify the deoxyribonuclease activity in biological fluids. Both assays are based on hydrolysis of biotinylated and fluorescein-labeled DNA substrates, with subsequent immunochemical detection of non-digested DNA. The assay based on hydrolysis of 974 bp PCR product labeled with biotinylated forward and fluorescein-labeled reverse primers is more sensitive (0.05 U/ml) and convenient for quantifying the DNase activity in biological fluids than the assay based on hydrolysis of double-labeled 20 bp oligonucleotide. The DNase activity in urine and blood plasma of healthy donors was measured using the PCR product-based assay. Urine samples revealed greater activity, 1.49+/-1.41 U/ml; blood plasma DNase I-like activity was 0.36+/-0.20 U/ml. DNase II-like activity was not detected in the plasma samples. The data obtained confirm that DNase I-like enzymes are responsible for the majority of deoxyribonuclease activity in blood plasma.
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PMID:Immunochemical assay for deoxyribonuclease activity in body fluids. 1761 45


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