Choi, Hyo Jin;Hwang, Sang Youn;Jang, Dae Ho;Cho, Hyung Min;Kang, Jung Hye;Seong, Gi Hun;Choo, Jae Bum;Lee, Eun Kyu
Korean Chemical Engineering Research
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v.44
no.1
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pp.65-72
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2006
Recent technical advances in the biorecognition engineering and the microparticle fabrication may enable us to develop the single step purification using magnetic particle, because of its simplicity, efficacy, ease of automation, and process economics. In this study, we used commercial magnetic particles from Seradyn, Inc. (Indianapolis, USA). It was ca. 2.8 micron in diameter, consisted of polystyrene core and magnetite coating, and its surface had carboxyl groups. The model, capture protein was IgG and anti-IgG was used as the ligand molecule. We studied the different surfaces ('nude', ester-activated, and anti-IgG coated) for their biorecognition of IgG. At a high pH condition, we could reduce non-specific binding. Also anti-IgG immobilized magnetic particle could capture IgG more selectively. We attempted 'oriented immobilization' of anti-IgG, in which the polysaccharides moiety near the C-terminus was selectively oxidized and linked to the hydrazine-coated MP, to improve the efficacy of biorecognitive binding. Using this method, the IgG capturing ability was improved by ca. 2 fold. From the binary mixture of the IgG-insulin, IgG could be more selectively captured. In summary, the oriented immobilization of oxidized anti-IgG proved to be as effective as the streptavidin-biotin system and yet simpler and cost-effective. This immobilization method can find its applications in protein biochips and biotargeting.
Journal of the Korean Society of Food Science and Nutrition
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v.32
no.7
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pp.1082-1087
/
2003
This study was designed to investigate the effects of butanol (BuOH) fraction of pine (Pinus densiflora Sieb et Zucc) needle extract on membrane fluidity (MF), basal and induced oxygen radicals (BOR and IOR), lipid peroxide (LPO) and oxidized protein (OP) as an oxidative stress, and lipofuscin (LF) in liver membranes of Sprague-Dawley male rats. The rats were fed basic diets (control group) and experimental diets (BuOH-25, BuOH-50 and BuOH-100) prepared with 25, 50 and 100 mg added to basic diet for 45 days. MFs were significantly increased (about 16∼22%) in mitochondria of BuOH-50 and BuOH-100 groups compared with control group (p<0.01∼0.001) BOR and IOR formations in mitochondria were significantly decreased (11∼17% and 11∼28%, respectively) in these three BuOH groups (p<0.05∼0.001), while BOR and IOR formations in microsomes were significantly decreased (11∼24%) in BuOH-50 and BuOH-100 groups, and (15∼24%) in these three BuOH groups compared with control group (p<0.05∼0.001; p<0.01-0.001). LPO levels were significantly decreased (9% and 9∼13%, respectively) in mitochondria of BuOH-100 and microsomes of BuOH-50 and BuOH-100 groups (p<0.05∼0.01), whereas OP levels were significantly decreased (10∼12%) in mitochondria of BuOH-50 and BuOH-100 groups compared with control group (p<0.05). LF formations were significantly decreased (8∼9%) in BuOH-50 and BuOH-100 groups (p<0.05). These results suggest that butanol fraction of pine needle extract may playa effective role in an attenuating an oxidative stress and increasing a membrane fluidity.
This study was designed to investigate the effects of sea tangle (Laminaria japonica) extract (Dasi-Ex group: dry base $4.0\%$) and fucoidan-added (Fuco-I, II, III group: fucoidan of $1,0\%,\;2.0\%,\;3.0\%$ added to Dasi-Ex) drinks on the formation of oxygen radicals and scavenger enzyme activities of stressed mice. ICR male mice (20 $\pm$2 g) were fed experimental diets and these drinks instead of water for 18 days including 4 days of sociopsychological stress. Dasi-Ex and Fuco-I, II and III groups resulted in a marked decreases $20\~40\%$ in basal oxygen radical (BOR) formation, and $15\~25\%$ in induced oxygen radical (IOR) formation compared with control group. Hydroxyl radical formations were significantly inhibited about $10\%$ in Dasi-Ex group, while remarkably inhibited $30\~40\%$ in Fuco-I, II and III groups. lipid peroxide (ISO) levels in Dasi-Ex group were not significantly different from those of control group, tut Fuco-I, II and III groups resulted in a significant decreases about $10\%$ in LPO levels compared with control group, Dasi-Ex, Fuco-I, II and III groups resulted in a marked decreases ($31\%,\;36\%,\;39\%$ and $42\%$, respectively) in oxidized protein levels through production of carbonyl group. Significant differences in nitric oxide (NO) levels in Dasi-Ex group were not obtained, but NO levels were slightly inhibited about $7\%$ in Fuco-I and II groups and $20\%$ in Fuco-III group compared with control group. Significant differences in superoxide dismutase (SOD) and catalase (CAT) activities in Dasi-Ex and Fuco-I groups were not obtained, but Fuco-II and III groups resulted in a significant increases $25\~40\%$ in SOD activities, and about $10\%$ in CAT activities compared with control group. These results suggest that the sociopsychological stress and aging process could be effectively inhibited by biological activity of sea tangle and fucoidan components.
This study investigated the muscular dystrophin levels in freely moving Australian cattle mainly fed grass, freely moving Korean cattle fed mainly a grain diet, and Korean cattle fed a grain diet but housed in a relatively limited space of a cow house. The total skeletal muscle specimens of 244 cattle were collected and immediately fixed in 10% neutral formalin. The same area was biopsied from the cattle in both countries. The findings showed that fatty infiltration is highly correlated with membrane-associated protein degradation in skeletal muscle, and that among several membrane-associated proteins, dystrophin showed the most significant reduction in expression in the cattle with fatty infiltration. Similarly, CD36 was more highly expressed in the cattle with fatty infiltration of skeletal muscle. Various breeding factors, such as oxidative stress; the presence of oxidized lipids in the diet; and environmental factors such as exercise, temperature and amount of time spent, may have critical effects on the degradation of normal cytoskeleton proteins, which are required for maintaining normal skeletal muscle architecture. Among the sarcolemma membrane-associated proteins, dystrophin is the most sensitive membrane protein that is involved muscular dystrophy and muscular degeneration. Thus, the present findings may be useful for studies on muscular dystrophy in humans or the pathogenesis of muscular diseases in animal models.
Kim, Min-Gab;Su'udi, Mukhamad;Park, Sang-Ryeol;Hwang, Duk-Ju;Bae, Shin-Chul
Journal of Life Science
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v.20
no.12
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pp.1777-1783
/
2010
Plants generate reactive oxygen species (ROS) as a by-product of normal aerobic metabolism or when exposed to a variety of stress conditions, which can cause widespread damage to biological macromolecules. To protect themselves from oxidative stress, plant cells are equipped with a wide range of antioxidant proteins. However, the detailed reaction mechanisms of these are still unknown. Peroxiredoxins (Prxs) are ubiquitous thiol-containing antioxidants that reduce hydrogen peroxide with an N-terminal cysteine. The active-site cysteine of peroxiredoxins is selectively oxidized to cysteine sulfinic acid during catalysis, which leads to inactivation of peroxidase activity. This oxidation was thought to be irreversible. Recently identified small protein sulphiredoxin (Srx1), which is conserved in higher eukaryotes, reduces cysteine.sulphinic acid in yeast peroxiredoxin. Srx1 is highly induced by $H_2O_2$-treatment and the deletion of its gene causes decreased yeast tolerance to $H_2O_2$, which suggest its involvement in the metabolism of oxidants. Moreover, Srx1 is required for heat shock and oxidative stress induced functional, as well as conformational switch of yeast cytosolic peroxiredoxins. This change enhances protein stability and peroxidase activity, indicating that Srx1 plays a crucial role in peroxiredoxin stability and its regulation mechanism. Thus, the understanding of the molecular basis of Srx1 and its regulation is critical for revealing the mechanism of peroxiredoxin action. We postulate here that Srx1 is involved in dealing with oxidative stress via controlling peroxiredoxin recycling in Arabidopsis. This review article thus will be describing the functions of Prxs and Srx in Arabidopsis thaliana. There will be a special focus on the possible role of Srx1 in interacting with and reducing hyperoxidized Cys-sulphenic acid of Prxs.
Cytochrome c oxida5e from chemotrophically grown R p , geliitinosu was purified by cytochrome c affinity chromatography and DEAE-Sephacel ion exchange chromatography. The molecular weight of the cytochrome c oxidase was approximately 110.000 Da by sephacryl s-300 gel chromatography and approximately 52, 000 Da by SDS-gel electrophoresis, respectively. Therefore. cytochrolne c oxidase of Rps. gehtinosu seems to be dimer. The cytochrome c oxidasc was very sensitive to temperature. It's Km and Vmax were 20 pM and 44 unitlmg protein for horsc heart cytochrome c as a substrate. respectively, and its optimum pH and temperature were 6.4 and 25$^{\circ}$C. respectively. The absorption peaks of the reduced cytochrome c oxidase showed at 554 nm, 523 nm. and 422 nm. The activiiy of cytochrome c oxidase was inhibited by KCN, and NaN3, but not by CO, antimycir~ A. and myxothiazol. The cytochrome c-551 was produced either in phototrophically or chemotrophically grown Rps. gelaiinosci. The rcduced cytochrome c-551 was oxidized by b-type cytochrome c oxidase from Rp.v. gc.lrtino.sc~. Km and Vmax of cytochrome c oxidase was 26 pM and 31 unitlnlg protein For cytochrome c-551 as a substrate. respectively. Thercfore. thc electron transfer chain of chemotrophically grown Rps. glatinosa seems lo be ubiquinol cytochrome bc, complex -'cytochrome c-55lMb-type cytochrome c oxidase+02.
Biochemical composition, the rates of nitrogen excretion in the form of ammonia, amino acids and total nitrogen, and oxygen consumption of the shrimp Crangon affinis were measured at three temperature regimes $(7,\;15,\;and\;25^{\circ}C)$ and the variations were also determined for starvation periods (1-25 days). The composition of the major biochemical fractions was analysed into carbohydrate: $4.2\%,\;protein:\;68.6\%,\;lipid:\;7.0\%,\;chitin:\;6.3\%,\;and\;ash:\;14.6\%,$ all expressed as percentage of dry weight. Molting frequency was lower at $7^{\circ}C\;than\;25^{\circ}C$ during the period of starvation, and during the same period the higher temperature was, body weight and body compositions the more decreased. Through all starvation periods $O_2$ consumption tended to decrease but total nitrogen tended to increase at any temperature regimes. The dominant form of excreted total nitrogen was ammonia-N at any temperature. From the O:N ratio it appeared that carbohydrate and lipid reserves were quickly exhausted (1-5 days), and that proteins were the substrates oxidized to meet the energetic requirements of C. affinis at any temperature. After 25 days of starvation the O:N ratio remained constant near a value of 8, which indicates that only proteins were being utilized at three temperatures. After 25 days of starvaion C. affinis excreted 23.01ug N/mg body nitrogen per day at $7^{\circ}C,\;32.97\mu g\;N/mg$ body nitrogen per day at $15^{\circ}C,\;and\;44.81\mu g\;N/mg$ body nitrogen per day at $25^{\circ}C$, and lost about 1.75, 2.47 and $3.29^{\circ}C$ of body protein per day at 7, 15, and $25^{\circ}C$ respectively.
The Present study has been carried out to investigate the effect of refrigerated seawater (RSW) at $-1^{\circ}C$ in order to delay spoilage and extend the shelf-life in Sardine(Sardinops melanosticta). The result obtained are summarized as follows : In case of freshness, K-value was shown above $30\%$ at 1 day of storage by icing, but in RSW system was shown $20\%$ until 2 days by storage. VBN and TMA were also shown the similar tendency when compared to K-value. The lipids extracted from sardine muscle held in ice was oxidized much more than those in RSW system by way of chemical test such as TBA and POV. The myofibrillar protein extracted from sardine stored in RSW system was denaturized more slowly compared with those by ice. $Ca^{2+}-ATPase$ activity indicated that myofibrillar protein held in RSW system was more stable than those held in ice. Total viable counts for sardine in RSW system showed an overall lower values. By TPA(Textural Porfile Analysis) , sardine meat pastes held in RSW system have a higher value than those held in ice.
Lim Hyun Sook;Goo Jae Whan;Kim Lee Hyun;Kim Si Wouk;Cho Eun Hee
Korean Journal of Microbiology
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v.41
no.1
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pp.1-7
/
2005
Methylophaga aminosulfidovorans SK1 (KCTC 10323 BP) can utilize trimethylamine as a sole carbon, nitrogen, and energy source. The bacterial flavin-containing monooxygenase (bFMO) gene was identified in the strain and the recombinant enzyme expressed in E. coli oxidized trimethylamine. To study the function and regulation of the bfmo, over 8,000 nucleotide sequences of the neighboring regions including the bfmo were determined. Three open reading frames proceeding to the bfmo gene encoded analogues to highly conserved nitrate/nitrite sensing two-component system regulators and a methyl accepting protein. Two small open reading frames just downstream of the bfmo gene showed no similar proteins of known functions but the sequences were conserved among other bacteria. Reverse transcription-polymerase chain reaction analysis showed that the six putative genes consisted of three transcription units. The three regulatory genes located upstream of the bfmo gene formed two separate transcription units. The bfmo and the two downstream genes were transcribed from a single promoter.
Oxidized low-density lipoprotein (oxLDL) has been shown to modulate transactivations by the peroxisome proliferator activated receptor (PPAR)$\gamma$ and nuclear factor-kappa B (NF$\kappa$B). In this study, the oxLDL signaling pathways involved with the NF$\kappa$B transactivation were investigated by utilizing a reporter construct driven by three upstream NF$\kappa$B binding sites, and various pharmacological inhibitors. OxLDL and its constituent lysophophatidylcholine (lysoPC) induced a rapid and transient increase of intracellular calcium and stimulated the NF-KB transactivation in resting RAW264.7 macrophage cells in an oxidation-dependent manner. The NF$\kappa$B activation by oxLDL or lysoPC was inhibited by protein kinase C inhibitors or an intracellular calcium chelator. Tyrosine kinase or PI3 kinase inhibitors did not block the NF$\kappa$B transactivation. Furthermore, the oxLDL-induced NF$\kappa$B activity was abolished by the PPAR$\gamma$ ligands. When the endocytosis of oxLDL was blocked by cytochalasin B, the NF$\kappa$B transactivation by oxLDL was synergistically increased, while PPAR transactivation was blocked. These results suggest that oxLDL activates NF-$\kappa$B in resting macrophages via protein kinase C- and/or calcium-dependent pathways, which does not involve the endocytic processing of oxLDL. The endocytosis-dependent PPAR$\gamma$ activation by oxLDL may function as an inactivation route of the oxLDL induced NF$\kappa$B signal. Short heterodimer partner (SHP), specifically expressed in liver and a limited number of other tissues, is an unusual orphan nuclear receptor that lacks the conventional DNA-binding domain. In this work, we found that SHP expression is abundant in murine macrophage cell line RAW 264.7 but suppressed by oxLDL and its constituent I3-HODE, a ligand for peroxisome proliferator-activated receptor y. Furthermore, SHP acted as a transcription coactivator of nuclear factor-$\kappa$B (NF$\kappa$B) and was essential for the previously described NF$\kappa$B transactivation by lysoPC, one of the oxLDL constituents. Accordingly, NF$\kappa$B, transcriptionally active in the beginning, became progressively inert in oxLDL-treated RAW 264.7 cells, as oxLDL decreased the SHP expression. Thus, SHP appears to be an important modulatory component to regulate the transcriptional activities of NF$\kappa$B in oxLDL-treated, resting macrophage cells.
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