• Title, Summary, Keyword: SOD

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Expression and Purification of Recombinant Superoxide Dismutase (PaSOD) from Psychromonas arctica in Escherichia coli

  • Na, Ju-Mee;Im, Ha-Na;Lee, Kyung-Hee
    • Bulletin of the Korean Chemical Society
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    • v.32 no.7
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    • pp.2405-2409
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    • 2011
  • The psychrophilic bacteria Psychromonas arctica survives at subzero temperatures by having adapted several protective mechanisms against freezing and oxidative stresses. Many reactive oxygen species are likely generated in P. arctica as a result of reduced metabolic turnover rates. A previous study identified the pasod gene for superoxide dismutase from P. arctica using a series of PCR amplifications. Here, upon cloning into a His-tag fused plasmid, the sod gene from P. arctica (pasod) was successfully expressed by IPTG induction. His-tagged PaSOD was subsequently purified by $Ni^{2+}$-NTA affinity chromatography. The purified PaSOD exhibited a higher SOD activity than that of Escherichia coli (EcSOD) at all temperatures. The difference in activity between PaSOD and EcSOD becomes even more significant at 4$^{\circ}C$, indicating that PaSOD plays a functional role in the cold adaptation of P. arctica in the Arctic.

Modulation of MnSOD in Cancer: Epidemiological and Experimental Evidences

  • Kim, Ae-Kyong
    • Toxicological Research
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    • v.26 no.2
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    • pp.83-93
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    • 2010
  • Since it was first observed in late 1970s that human cancers often had decreased manganese superoxide dismutase (MnSOD) protein expression and activity, extensive studies have been conducted to verify the association between MnSOD and cancer. Significance of MnSOD as a primary mitochondrial antioxidant enzyme is unquestionable; results from in vitro, in vivo and epidemiological studies are in harmony. On the contrary, studies regarding roles of MnSOD in cancer often report conflicting results. Although putative mechanisms have been proposed to explain how MnSOD regulates cellular proliferation, these mechanisms are not capitulated in epidemiological studies. This review discusses most recent epidemiological and experimental studies that examined the association between MnSOD and cancer, and describes emerging hypotheses of MnSOD as a mitochondrial redox regulatory enzyme and of how altered mitochondrial redox may affect physiology of normal as well as cancer cells.

Cloning and Characterization of the Cu,Zn Superoxide Dismutase (SOD1) cDNA from the Spider, Araneus ventricosus

  • Choi Young Soo;Choo Young Moo;Li Jianhong;Sohn Hung Dae;Jin Byung Rae
    • International Journal of Industrial Entomology
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    • v.10 no.1
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    • pp.73-77
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    • 2005
  • A Cu,Zn superoxide dismutase (SOD1) cDNA was cloned from the spider, Araneus ventricosus. The A. ventricosus SOD1 (AvSOD1) cDNA contains an open reading frame of 495 bp encoding 165 amino acid polypeptide with a predicted molecular mass of 17,114 Da and pI of 6.55, and possesses the typical metal binding ligands of six histidines and one aspartic acid common to SOD1s. The deduced amino acid sequence of the AvSOD1 cDNA showed $51\%$ identity to Ceratitis capitata SOD1, and $50\%$ to SOD1 sequences of both Drosophila melanogaster and Chymomyza amoena. Northern blot analysis revealed the presence of AvSOD1 transcripts in all tissues examined.

Construction of Gene-Specific Primers for Various Antioxidant Isoenzyme Genes and Their Expressions in Rice (Oryza sativa L.) Seedlings Obtained from Gamma-irradiated Seeds

  • Kim, Jin-Hon;Chung, Byung-Yeoup;Kim, Jae-Sung;Wi, Seung-Gon;Yang, Dae-Hwa;Lee, Choon-Hwan;Lee, Myung-Chul
    • Journal of Photoscience
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    • v.11 no.3
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    • pp.115-120
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    • 2004
  • For the expression study of antioxidant isoenzyme genes in rice (Oryza sativa L.) plants, extensive searches for genes of superoxide dismutase (SOD), ascorbate peroxidase (APX), and catalase (CAT) isoforms were performed through the GenBank database. The genes for two cytosolic and one plastidic CuZn-SOD, one Fe-SOD, two Mn-SOD, two cytosolic and two chloroplastic (stromal and thylakoid) APX, and three CAT isoforms were available in japonica-type rice. These isoforms were named as cCuZn-SOD1, cCuZn-SOD2, pCuZn-SOD, Fe-SOD, Mn-SOD1, Mn-SOD2, cAPXa, cAPXb, Chl_sAPX, Chl_tAPX, CATa, CATb, and CATc, respectively. Since they shared a high degree of homology in the nucleotide and amino acid sequences, the gene-specific primers for the genes were designed directly from their full-length cDNAs found in the database except for the CATa gene. These primers were used in the RT-PCR analysis to investigate the differential expression of antioxidant isoenzyme genes in rice plants from the seeds irradiated with low doses (2, 4, 8, and 16 Gy) of gamma-radiation. The gammairradiation slightly increased the transcripts of pCuZn-SOD, while those of Fe-SOD, cAPXb, and CATb decreased. However, no substantial differences were observed in the expression of all the isoenzyme genes between the control and irradiated groups. In this study, gene specific primers for thirteen SOD, APX and CAT isoenzymes were constructed from the full-length cDNAs. The results of RT-PCR analysis obtained by using these primers suggests that the expression levels of SOD, APX, and CAT isoenzyme genes in rice seedlings were hardly affected by gamma-irradiation at the seed stage.

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Superoxide Dismutase Activity in Suspension Cultured Cells of Tomato (Lycopersicon esculentum Mill) (토마토(Lycopersicon esculentum Mill) 현탁배양세포에서 Superoxide Dismutase 활성)

  • 유순희;허경혜;권석윤;이행순;방재욱;곽상수
    • Korean Journal of Plant Tissue Culture
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    • v.24 no.1
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    • pp.57-61
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    • 1997
  • We investigated changes in the superoxide dismutase (SOD) activity and SOD isoenzyme pattern in suspension cultures of tomato (Lycopersicon esculentum), which were compared with those of intact tomato plants. two grams (fr wt) of cells subcultured at 15-day intervals were inoculated into 50 mL MS medium containing l mg/L 2,4-D and 30 g/L sucrose in a 300 mL flask and maintained at $25^{\circ}C$ in the dark (100 rpm). The cell growth reached a maximum at 20 days after subculture (DAS), followed by a rapid decrease with further cultures. The cell colour changed from white to black from 23 DAS. The intracellular SOD activity (units/g cell dry wt) was significantly increased from 23 DAS and reached a maximum at 28 DAS (52,400 units), followed by a decrease with further cultures, whereas the extracellular SOD activity showed a maximum at 25 DAS (27,800 units/50 mL medium). The total SOD activity per flask showed a maximum at 25 DAS (35,700 units), in which the extracellular SOD activity occupied about 75%. The tomato cultured cells had four SOD isoenzymes and their patterns were well correlated with SOD activity without a qualitative change during the cell cultures. The intact tomato plants had an additional CuZnSOD isoenzyme, showing the different isoenzyme patterns from cultured cells.

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Isolation of Superoxide Dismutase cDNAS from an Weedy Rice Variety and Transformation of a Cultivated Rice Variety (잡초성벼의 superoxide dismutase cDNA cloning과 재배벼로의 형질전환)

  • Park, Sang-Gyu;Park, Jong-Suk;Lee, Seung-In;Suh, Suk-Chul;Kim, Byung-Keuk;Jo, Youl-Lae;Suh, Hak-Soo
    • Korean Journal of Environmental Agriculture
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    • v.21 no.2
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    • pp.156-161
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    • 2002
  • Two different cDNA clones for superoxide dismutase (SOD) were isolated from an weedy rice variety (Oryza sativa, cv. Bhutan14Ad) and were introduced into a cultivated rice variety (Oryza sativa, cv. Nakdong) in order to develop the environmental stress-resistant rice plants. Sequence analysis of the cloned cDNAS indicated that the deduced amino acid sequence of SOD-A is 88.4% identical to that of SOD-B. Furthermore, the nucleotide sequence of SOD-A is 99.3% identical to that of a Cu/Zn SOD gene of Oryza sativa (GenBank accession No. L36320). The nueleotide sequence of SOD-B was identical to that of the previously published SOD gene (Accession No. D01000). A cultivated rice variety, Nakdong-byeo, was transformed with chimeric SOD genes containing a actin promoter of rice and pin2 terminator using a particle bombardment technique. Transformed calli were selected on an selection medium containing phosphinothricin (PPT). Transgenic rice plants were regenerated from the PPT-resistant calli. PCR analysis with genomic DNAs from transgenic plants revealed that transgenes are introduced into rice genome.

Permission-Based Separation of Duty Model on Role-Based Access Control (역할기반 접근제어 환경에서 접근권한 기반의 임무분리 모델)

  • Oh Se-Jong
    • The KIPS Transactions:PartC
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    • v.11C no.6
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    • pp.725-730
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    • 2004
  • Separation of Duty(SOD), with delegation, is one of important security principles in access control area. The role-based access control model adopts SOD principle, but it has some problems; SOD concept is inconsistent with role hierarchy, permissions that have no relation with SOD may be restricted, and delegation may violate SOD. We propose permission-based SOD model on role-based access control. We establishes SOD as a set of permissions instead of role level SOD. Furthermore we propose a principle of role activation. It solves SOD problems of RBAC and supports easy implementation of SOD policy.

Genomic Structure of the Cu/Zn Superoxide Dismutase(SOD1) Gene from the Entomopathogenic Fungus, Cordyceps pruinosa

  • Park, Nam Sook;Jin, Byung Rae;Lee, Sang Mong
    • International Journal of Industrial Entomology
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    • v.39 no.2
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    • pp.67-73
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    • 2019
  • The genomic structure of the Cu/Zn superoxide dismutase (SOD1) gene from the entomopathogenic fungus, Cordyceps pruinosa was characterized. The SOD1 gene of C. pruinosa spans 947 nucleotides and consisted of four exons encoding for 154 amino acids and three introns. Four exons of the SOD1 gene are composed of 13, 331, 97 and 20 nucleotides respectively. Homology search of amino acid sequences of the SOD1 gene of C. pruinosa with another 13 fungi species showed higher sequence similarity of 69% ~ 95% and had the most highest sequence identity of 95% with Beauveria bassiana and Cordyceps militaris, which can easely infect domesticated Bombyx mori and another wild lepidopteran species in artificial or natual manner of infection. This SOD1 gene sequence showed copper, zinc and beta-barrel fold sites. Homology search showed that the Cu/Zn SOD1 gene from the entomopathogenic fungus, C. pruinosa is an orthologous gene homolog present in different species of organism whose ancestor predates the split between the relating species. In addition, C. pruinosa SOD1 gene is placed together within the ascomycetes group of fungal clade. From these results it is concluded that C. pruinosa SOD1 gene is orthologous gene having the same or very similar functions with a common evolutionary ancestor.

Superoxide Dismutase Profiles in the Mesophilic Deinococcus Species

  • Yun, Young-Sun;Lee, Young-Nam
    • Journal of Microbiology
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    • v.39 no.3
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    • pp.232-235
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    • 2001
  • Electrophoretic resolution of superoxide dismutase (SOD) from the highly UV-resistant bacteria, Deinococcus species revealed multiple forms of superoxide dismutases (SODs) in D. radiodurans, D. grandis, and D. proteolyticus, as judged from electrophoretic properties and metal cofactors. A single SOD occurred in both D. radiophilus and D. radiopugnans. Deinococcal SODs were either MnSOD, FeSOD or cambialistic Mn/FeSOD. The unique SOD profile of each mesophilic Deinococcus species, multiplicity and metal cofactors would be valuable in identifying Deinococcus species.

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Pre-Exercise Protective Effects Against Renal Ischemic Reperfusion Injury in Hsp 70.1 Knockout Mice (Hsp70.1유전자결핍된 마우스에서 허혈 재관류 신장손상에 대한 전처치 운동의 보호효과)

  • Lee, Jin;Kim, Won-Kyu
    • Journal of Life Science
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    • v.20 no.4
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    • pp.555-560
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    • 2010
  • The objective of this study was to investigate levels of serum creatinine, CuSOD and MnSOD protein expression in the kidney after renal ischemic reperfusion with pre-exercise using heat shock protein 70.1 in knock-out mice (KO). The C57/BL6 strain (Wild type: WT) and KO were divided into 4 groups as follows: Sham control group (Sham), pre-exercise group (Ex), pre-exercise +ischemia group (Ex+IR), and ischemia group (IR). CuSOD and MnSOD expression were significantly decreased (p<0.01, p<0.05) and blood creatinine concentration was significantly increased (p<0.01) in the IR group of KO. In contrast, CuSOD and MnSOD expression in the Ex+IR group of KO were higher than the IR group, while creatinine concentration was significantly lower. These results suggest that Hsp70 is directly correlated to renal ischemic reperfusion injury. Pre-exercise in renal ischemia might prevent or inhibit positive oxidative stress inhibitory effects by increasing anti-oxidative enzymes (CuSOD, MnSOD) within the kidney and improve to prevent renal function. Thus, pre-exercise may have a protective role against renal injury after renal ischemia.