Journal of the Society of Cosmetic Scientists of Korea
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v.21
no.1
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pp.53-66
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1995
The gene for ${\gamma}$-casein, a milk protein, is a member of a family of casein gene which is expressed in mammary glands of the animal during the late gestation and lactation periods binder the influence of various hormones. In order to elucidate tile mechanisms b)'which hormones regulate the coordinate induction of milk protein genes, the mouse ${\gamma}$-casein gene was isolated and characterized. The ${\gamma}$-casein gene was screened from a mouse genomic library constructed in bacteriophage EMBL3 with the ${\gamma}$-casein CDNA used as probe and one clone was obtained. The ${\gamma}$-casein CDNA as probe was partially sequenced and contained ATG start codon and 5'-noncoding region. The cloned genomic DNA was digested with Sal I restriction enzyme, by which the insert DNA can be isolated from EMBL3 vector. Three DNA bands were observed and the size of DNAs was approximately 28kb, 14kb and 9Kb, respectively Accordingly the size of the insert DNA was calculated with approximately 23Kb. The result of Southern blot analysis, however, showed that the cloned genomic DNA was not hybridized with the synthetic oligonucleotides (40 mer) of cDNA 5'-end region, but it was hybridized with the y -casein CDNA. This means that tile cloned y -casein gene may not contain its promoter region. The ${\gamma}$ -casein genomic DNA containing the promoter region has been screening from mouse genomic library with oligonucleotides of CDNA 5'-end region as probe, and twenty-nine clones was obtained.
The orthogonal pair of Saccharomyces cerevisiae tyrosyl-tRNA synthetase (Sc YRS) and a variant of E. coli initiator tRNA, fMam $tRNA_{CUA}$ which recognizes the amber stop codon is an effective tool for site-specific incorporation of unnatural amino acids into the protein in E. coli. To evolve the amber suppression activity of the orthogonal pair, we generated a mutant library of Sc YRS by randomizing two amino acids at 320 and 321 which involve recognition of the first base of anticodon in fMam $tRNA_{CUA}$. Two positive clones are selected from the library screening with chloramphenicol resistance mediated by amber suppression. They showed growth resistance against high concentration of chloramphenicol and their $IC_{50}$ values were approximately 1.7~2.3 fold higher than the wild type YRS. In vivo amber suppression assay reveals that mutant YRS-3 (mYRS-3) clone containing amino acid substitutions of P320A and D321A showed 6.5-fold higher activity of amber suppression compared with the wild type. In addition, in vitro aminoacylation kinetics of mYRS-3 also showed approximately 7-fold higher activity than the wild type, and the enhancement was mainly due to the increase of tRNA binding affinity. These results demonstrate that optimization of anticodon recognition by engineered aminoacyl tRNA synthetase improves the efficiency of unnatural amino acid incorporation in response to nonsense codon.
Cho, Eun Seok;Jung, Won Youg;Kwon, Eun Jung;Park, Da Hye;Chung, Ki Hwa;Cho, Kwang Keun;Kim, Chul Wook
Asian-Australasian Journal of Animal Sciences
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v.20
no.11
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pp.1655-1661
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2007
Prolyl 4-hydroxylase (P4H) plays a central role in collagen synthesis by catalyzing the hydroxylation of the proline residue in the X-Pro-Gly amino acid sequence, and controls the biosynthesis of collagen that influences overall meat quality. In order to verify expression level of the catalytic ${\alpha}$ subunit of P4H, a 2.7 kb clone of the ${\alpha}$ subunit gene for P4H was selected from a cDNA library prepared from the muscular tissue of Sancheong berkshire pigs, and the whole gene sequence was determined. As expression level of the ${\alpha}$ subunit of P4H differed between tissues of pigs, we intended to assess more precisely the level of ${\alpha}$-subunit expression between tissues of Sancheong Berkshire pigs by using RT-PCR. Muscular and adipose tissues were taken from each pig grouped by growth stage (weighing 60, 80, and 110 kg) of Yorkshire and Sancheong Berkshire pigs, and the expression levels of the ${\alpha}$-subunit of P4H were examined. Since there were significant differences in the expression level with respect to variation in growth stage (p<0.01), an attempt was made to identify any influences of pig species and tissue variation. The muscular and adipose tissues of pigs weighing 110 kg showed higher expression levels than pigs weighing 60 kg and 80 kg. In general, significantly higher expression levels were found in muscular than in adipose tissue. The expression levels in Sancheong Berkshire were significantly higher than in Yorkshire pigs (p<0.01 or p<0.05). Since expression level of the ${\alpha}$-subunit of P4H affects the activity of P4H and is connected to the biosynthesis of collagen and increased collagen can improve meat texture, this finding may explain why meat quality of the Sancheong Berkshire pig is acclaimed in Korea. Given the higher expression levels of the ${\alpha}$-subunit gene in adipose than in muscular tissue, and also in the heavier pigs, more intensive studies are required to assess the correlation between expression level of the ${\alpha}$ subunit gene and overall meat quality.
Hyalophora cecropia attacin-like antibacterial gene was isolated from Bombyx mori induced with nonpathogenic bacteria. It was expressed in Spodopfera frugiperda 9 (Sf9 cells using baculovirus expression vector system (BEVS), and examined its antibacterial activity. With a cDNA library constructed from fifthinstar B. mori injected with Escherichia coli(4 X IOhcellsllarva), differential screening was performed using naive and induced mRNA probes. BmInc6 clone was screened by partial nucleotide sequence and GenBank database analysis. A complete nucleotide sequence of Bmlnc6 cDNA was determined (GenBank, AF005384). Its insert size was 852 bp and had open reading frame that started translation at position 35 and stopped at 679. And its putative polyadenylational signal existed at 812 bp. The number of amino acid deduced from Bmlnc6 cDNA was 214 and hydropathy analysis showed that this peptide was hydrophilic. This peptide deduced by BmInc6 was named nuecin. When the nuecin gene was expressed in Sf9 cells using BEVS, about 950 bp of the transcripts was detected. In addition, SDS-PAGE analysis showed that the molecular weights of intracellular expressed protein and the mature protein secreted to culture media were approximately 23 and 20 kDa, respectively. The antibacterial activity of nuecin against E. coli and Bacillus subtilis was significantly high, demonstrating that nuecin had a wider antibacterial spectrum with gram negative and positive bacteria than attacin.
One of the better-characterized transcription factor of E. coli is the cAMP receptor protein(CRP) and the CRP binds cAMP and DNA. The cAMP-CRP complex is involved in regulation of many genes at bacteria. The cAMP-CRP regulatory element represents, in some respects, a global regulatory network. The aim of this work was to study the structure and the mechanisms controlling the expression of CRP in Serratia marcescens. We have been get 5 different clones from Serratia which stimulated the cells to use maltose as a sole carbon source in E. coli TP2139. The crp gene clone, pCKB12, was confirmed by Southern hybridization with E. coli crp gene. The location of the crp gene was determined by construction subclones carrying various portions of pCKB12. To investigate the potential role of CRP in E. coli, lacZ fused plasmids were constructed and investigated the ${\beta}$-galactosidase activity of the fused plasmid. The Serratiamarcescens cAMP receptor protein can substitute the E. coli CRP in transcriptional activation at the lacZ gene. These results suggest that Serratia marcescens cAMP receptor protein complex functions to regulate several promoters in E. coli.
By screening a cDNA library of auxin-treated mung bean (Vigna radiata L.) hypocotyls, we have isolated two full-length cDNA clones, pVR-ACS6 and pVR-ACS7, for 1-aminocyclopropane-1-carboxylate (ACC) synthase, the rate-limiting enzyme in the ethylene biosynthetic pathway. While PVR-ACS6 corresponds to the previously identified PCR fragment pMBA1, pVR-ACS7 is a new cDNA clone. A comparison of deduced amino acid sequences among auxin-induced ACC synthases reveal that these enzymes share a high degree of homology (65-75%) to VR-ACS6 and VR-ACS7 polypeptides, but only about 50% to VR-ACS1 polypeptide. ACS6 and ACS7 are specifically induced by auxin, while ACS1 is induced by cycloheximide, and to lesser extent by excision and auxin treatment. Results from nuclear run-on transcription assay and RNA gel blot studies revealed that all three genes were transcriptionally active displaying unique patterns of induction by IAA and various hormones in etiolated hypocotyls. Particularly, 24-epibrassinolide (BR), an active brassinosteroid, specifically enhanced the expression of VR-ACS7 by distinct temporal induction mechanism compared to that of IAA. In addition, BR synergistically increased the IAA-induced VR-ACS6 and VR-ACS7 transcript levels, while it effectively abolished both the IAA- and kinetin-induced accumulation of VR-ACS1 mRNA. In light-grown plants, VR-ACS1 was induced by IAA in roots, whereas W-ACS6 in epicotyls. IAA- and BR-treatments were not able to increase the VR-ACS7 transcript in the light-grown tissues. These results indicate that the expression of ACC synthase multigene family is regulated by complex hormonal and developmental networks in a gene- and tissue-specific manner in mung bean plants. The VR-ACS7 gene was isolated, and chimeric fusion between the 2.4 kb 5'-upstream region and the $\beta$-glucuronidase (GUS) reporter gene was constructed and introduced into Nicotiana tobacum. Analysis of transgenic tobacco plants revealed the VR-ACS7 promoter-driven GUS activity at a highly localized region of the hypocotyl-root junction of control seedlings, while a marked induction of GUS activity was detected only in the hypocotyl region of the IAA-treated transgenic seedlings where rapid cell elongation occurs. Although there was a modest synergistic effect of BR on the IAA-induced GUS activity, BR alone failed to increase the GUS activity, suggesting that induction of VR-ACS7 occurs via separate signaling pathways in response to IAA and BR.
LEE, JIN WOO;EUI SO CHOI;KYUNG IK GIL;HAN WOONG LEE;SANG HYON LEE;SOO YOOUN LEE;YONG KEUN PARK
Journal of Microbiology and Biotechnology
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v.11
no.6
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pp.994-1001
/
2001
An easier way of understanding the BNR system was proposed from the study on substrate, nutrient removal tendency, microbial community and its metabolic function by applying the municipal settled sewage. During the anaerobic period, the phosphorus release rate per VFACOD we varied depending on the phosphorus content in the sludge. When the phosphorus content in the sludge was $6\%$ VSS, according to influent VFACOD, the phosphorus release rate and PHA production were $0.35 gPO_4P/gVFACOD$ and 1.0 gPHA/gVFACOD, respectively. The $NO_3N$ requirement for the phosphorus uptake as an electron acceptor was about $0.5 gNO_3N/gPO_4P_{uptake}$ based on the proposed equation with PHA, biomass, production, and the concentration of phosphorus release/uptake. Bacterial-community analysis of the sludge, as determined by FISH and 16SrDNA characterization FISH, revealed that the beta-subclass proteobacteria were the most abundant group ($27.9\%$ of the proteobacteria-specific probe EUB338), and it was likely that representative of the beta-subclass played key roles in activated sludge. The next dominant group found was the gamma-protebacteria ($15.4\%$ of probe EUB338). 16S rDNA clone library analysis showed that the members of${\beta}$- and ${\gamma}$-proteobacteria were also the most abundant groups, and $21.5\%$ (PN2 and PN4) and $15.4\%$ (PN1 and PN5) of total clones were the genera of denitrifying bacteria and PAO, respectively. Prediction of the microbial community composition was made with phosphorus content (Pv, $\%$ P/VSS) in wasted sludge and profiles of COD, PHA, $PO_4P,\;and\;NO_3N$ in an anaerobic-anoxic SBR unit. Generally, the predicted microbial composition based upon metabolic function, i.e., as measured by stoichiometry, is fairly similar to that measure by the unculturable dependent method. In this study, a proposal was made on he microbial community composition that was more easily approached to analyze the reactor behavior.
Park, Yong-Woo;Lim, Sun-Teak;Kang, Kyu-Young;Yun, Han-Dae
Applied Biological Chemistry
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v.38
no.4
/
pp.313-319
/
1995
The involvement of the cell-wall degrading enzymes in Rhizobium has long been an unsolved question about the infection process in the formation of root nodule. To assess the contribution of the cellulase to the nodulation of rhzobia, here we report the production of cellulase from R. meliloti TAL1372 which degrade carboxymethylcellulose (CMC) model substrate with CMC-plate method. We constructed a genomic library by cloning Sau3A-digested genomic DNA from R. meliloti TAL1372 into the BamHI site of the cosmid vector pLAFR3. Out of more than one thousand transductants of E. coli, one clone (pRC8-71) had CM-cellulase activity and contained pLAFR3 cosmid with 30 kb insert of R. meliloti DNA The product of CM-cellulase gene was analyzed by native PAGE. About 45 kD protein was considered to be a product of the gene. Tn5 mutagenesis reveals that the structural gene located in a ca. 3 kb KpnI fragment. The cellulase-minus mutants of R. meliloti TAL1372 were obtained by Tn5 mutagenesis of pRC8-71 and marker exchange techniques. Analyses of the nodulation ability of these Tn5 mutants showed that the CM-cellulase gene of R. meliloti TAL1372 may be involved in early nodulation development on alfalfa (Medicago satiua).
Kim, Ki-Chan;Lee, Seung-Don;Han, Ju-Hee;Sohng, Jae-Kyung;Liou, Kwang-Kyoung
한국생물공학회:학술대회논문집
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2000.11a
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pp.749-754
/
2000
PCR primers were designed based on consensus sequences of dTDP-D-glucose 4,6-dehydratase, one of the enzymes involved in the biosynthesis of deoxysugar. The PCR product (360 bp) was obtained from Thermus caldophilus GK24. Colony hybridization was carried out to the cosmid library constructed from T. caldophilus GK24 genomic DNA by the PCR product DNA fragment. We isolated a cosmid clone (pSMTC-1) that was subcloned to call pKCB series plasmid (BamHI fragments), partially sequenced and analyzed. pKCB80 (4.2 kb-BamHI DNA fragment) of them showed ORFs that was orfA, orfB, orfC and orfD. The orfABCD gene cluster is the deosysugar biosynthetic gene ; orfA (glucose-1-phosphate thymidylytransferase), orfB (dTDP-D-glucose 4,6-dehydratase), orfC (dTDP-4-keto-L-rhamnose reductase) and orfD (dTDP-4-keto-6-deoxy-D-glucose 3,5-epimerase). The gene cluster that was related in biosynthesis of dTDP-L-rhamnose was also identified by computer analysis, and we proposed that the biosynthetic pathway of deoxysugar analyzed from DNA sequencing of pKCB80 is from D-glucose-1-phosphate, dTDP-D-glucose, dTDP-4-keto-6-deoxy-D-glucose via dTDP-4-keto-L-rhamnose to dTDP-L-rhamnose.
Proceedings of the Korean Society for Bioinformatics Conference
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2001.10a
/
pp.61-86
/
2001
All cancers are caused by abnormalities in DNA sequence. Throughout life, the DNA in human cells is exposed to mutagens and suffers mistakes in replication, resulting in progressive, subtle changes in the DNA sequence in each cell. Since the development of conventional and molecular cytogenetic methods to the analysis of chromosomal aberrations in cancers, more than 1,800 recurring chromosomal breakpoints have been identified. These breakpoints and regions of nonrandom copy number changes typically point to the location of genes involved in cancer initiation and progression. With the introduction of molecular cytogenetic methodologies based on fluorescence in situ hybridization (FISH), namely, comparative genomic hybridization (CGH) and multicolor FISH (m-FISH) in carcinomas become susceptible to analysis. Conventional CGH has been widely applied for the detection of genomic imbalances in tumor cells, and used normal metaphase chromosomes as targets for the mapping of copy number changes. However, this limits the mapping of such imbalances to the resolution limit of metaphase chromosomes (usually 10 to 20 Mb). Efforts to increase this resolution have led to the "new"concept of genomic DNA chip (1 to 2 Mb), whereby the chromosomal target is replaced with cloned DNA immobilized on such as glass slides. The resulting resolution then depends on the size of the immobilized DNA fragments. We have completed the first draft of its Korean Genome Project. The project proceeded by end sequencing inserts from a library of 96,768 bacterial artificial chromosomes (BACs) containing genomic DNA fragments from Korean ethnicity. The sequenced BAC ends were then compared to the Human Genome Project′s publicly available sequence database and aligned according to known cancer gene sequences. These BAC clones were biotinylated by nick translation, hybridized to cytogenetic preparations of metaphase cells, and detected with fluorescein-conjugated avidin. Only locations of unique or low-copy Portions of the clone are identified, because high-copy interspersed repetitive sequences in the probe were suppressed by the addition of unlabelled Cotl DNA. Banding patterns were produced using DAPI. By this means, every BAC fragment has been matched to its appropriate chromosomal location. We have placed 86 (156 BAC clones) cytogenetically defined landmarks to help with the characterization of known cancer genes. Microarray techniques would be applied in CGH by replacement of metaphase chromosome to arrayed BAC confirming in oncogene and tumor suppressor gene: and an array BAC clones from the collection is used to perform a genome-wide scan for segmental aneuploidy by array-CGH. Therefore, the genomic DNA chip (arrayed BAC) will be undoubtedly provide accurate diagnosis of deletions, duplication, insertions and rearrangements of genomic material related to various human phenotypes, including neoplasias. And our tumor markers based on genetic abnormalities of cancer would be identified and contribute to the screening of the stage of cancers and/or hereditary diseases
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