• Title/Summary/Keyword: Nucleotides

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The Status of Guanine Nucleotides in Taxol-Stabilized Microtubules Probed by 31P CPMAS NMR Spectroscopy

  • Ferdous, Taslima;Lee, Sang-Hak;Yeo, Kwon-Joo;Paik, Youn-Kee
    • Journal of the Korean Magnetic Resonance Society
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    • v.15 no.2
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    • pp.104-114
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    • 2011
  • Rapid exchange and hydrolysis of the tubulin-bound guanine nucleotides have been known to govern the dynamics of microtubules. However, the instability and low concentration have made it difficult for the microtubule-bound GTP to be observed directly. In this study, we circumvent these problems by lyophilization and using cross-polarization techniques. $^{31}P$ NMR signals were detected from the tubulin-bound GTP in microtubules for the first time. Analysis of the $^{31}P$ CPMAS NMR spectrum indicates that GTP hydrolysis was delayed by the presence of taxol.

Processing of Corbicula elatior Beverage (재첩을 이용한 음료 가공)

  • 강동수;최옥수
    • Journal of Life Science
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    • v.11 no.2
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    • pp.138-143
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    • 2001
  • Marsh calm(Corbicular elatior)with a short-term storage in raw and a law-rate of utilization has been increasing the needs to develop new marsh calm processing products for a temporary mass treatment and long-term distribution, Therefore the processing conditions of marsh calm beverage using proteolytic enzyme hydrolysis were investigated. A partial hydrolysis at 6$0^{\circ}C$ for 1 hour after adding 3% Alcalase as more effective than a hot water extraction to develop taste compounds from the marsh calm. The result of ommission test showed that nucleotides and their related compounds were contributed in the taste of the marsh calm hydrolysates rather than free amino acids. The taste of the hydrolysates was produced by association with these compounds rather than only one compound s the hydrolystes taste differently for the control when one of these compound was omitted. The hydrolysates were fractionated to molecular weight below 500 dalton to eliminate bitter taste and to improve it flavor from the hydrolysates, 0.05% bay leaf was more effective to improve the odor than other herbs.

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CpG Islands Detector: a Window-based CpG Island Search Tool

  • Kim, Ki-Bong
    • Genomics & Informatics
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    • v.8 no.1
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    • pp.58-61
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    • 2010
  • CpG is the pair of nucleotides C and G, appearing successively, in this order, along one DNA strand. It is known that due to biochemical considerations CpG is relatively rare in most DNA sequences. However, in particular subsequences, which are a few hundred to a few thousand nucleotides long, the couple CpG is more frequent. These subsequences, called CpG islands, are known to appear in biologically more significant parts of the genome. The ability to identify CpG islands along a chromosome will therefore help us spot its more significant regions of interest, such as the promoters or 'start' regions of many genes. In this respect, I developed the CpG islands search tool, CpG Islands Detector, which was implemented in JAVA to be run on any platform. The window-based graphical user interface of CpG Islands Detector may facilitate the end user to employ this tool to pinpoint CpG islands in a genomic DNA sequence. In addition, this tool can be used to highlight potential genes in genomic sequences since CpG islands are very often found in the 5' regions of vertebrate genes.

Back to the Ends: Chromosomal DNA (염색체 말단부위)

  • Lee, Mi-Hyung;Suh, Dong-Chul
    • Childhood Kidney Diseases
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    • v.12 no.1
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    • pp.1-10
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    • 2008
  • Nucleic scids transfer the genetic information for serving a central biological purpose. The nucleic acids are polymers of nucleotides and they are mainly ribonucleic acid(RNA) and deoxyribonucleic acid(DNA). The nucleotides are stoichiometrically composed of five-carbon sugars, nitrogeneous bases, and phosphoric acids. The chemistry of nucleic acids and characteristics of different genomes are decribed for further study. Most of DNA genomes tend to be circular including bacterial genomes and eukaryotic mitochondrial DNA. Eukaryotic chromosomes in cells, in contrast, are generally linear. The ends of linear chromosomes are called telomeres. The genomes of different species, such as mammals, plants, invertebrates can be compared with the chromosome ends. The telomeric complex allows cells to distinguish the random DNA breaks and natural chromosomal ends. The very ends of chromosomes cannot be replicated by any ordinary mechanisms. The shortening of telomeric DNA templates in semiconservative replication is occurred with each cell division. The short telomere length is critically related to aging, tumors and dieases.

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Capsid Protein Gene Sequence Analysis and Development of Diagnostic Method by RT-PCR of Barley Yellow Mosaic Virus

  • Lee, Kui-Jae;So, In-Young
    • Plant Resources
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    • v.2 no.2
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    • pp.69-74
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    • 1999
  • A rapid and sensitive assay for specific detection and identification of barley yellow mosaic virus(BaYMV) was set up using the reverse transcriptase polymerase chain reaction(RT-PCR). A couple of primers was select to discriminate the viruses. PCR fragments of BaYMV(ca.0.9 kb) were obtained by using the method designed for BaYMV capsid protein. RT-PCR fragments were cloned with vector pT7 Blue and the resulting clones were sequenced. Capsid protein of BaYMV consisted of 297 amino acids and 891 nucleotides. The capsid protein sequence of BaYMV showed that 98% of nucleotides and 99% of amino acids homology.

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Cloning and Sequencing of the rph Gene Encoding RNase PH from Legionella pneumophila

  • Kim, Se-Jin;Lim, Jong-Seok;Cianciotto, Nicholas P.;Choe, Yong-Kyung
    • Journal of Microbiology
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    • v.37 no.4
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    • pp.218-223
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    • 1999
  • Legionella pneumophila, the cause of Legionnaires disease, is able to survive intracellularly in eukaryotic cells such as monocytes, macrophages, and protozoan organisms. During protein biosynthesis, the rph gene encodes ribonuclease (RNase) PH which functions as a phosphorolytic nuclease that removes nucleotides following the CCA terminus of tRNA and as a nucleotidyl-transferase which adds nucleotides to the ends of RNA molecules by usingnucelside diohosphates as substrates. In this sutdy, the rph gene was screened in pUC19 library employing a DNA probe which was constructed from PCR based on a consensus pattern of multiple alignment of RNas PH. The encoded protein consists of 235 amino acid residues with a calculated molecular weight of 26,112 Daltons. The RNase PH signature domains are completely conserved.

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Identification of Marker Nucleotides for the Molecular Authentication of Arisaematis Rhizoma Based on the DNA Barcode Sequences (천남성(天南星) 유전자 감별을 위한 DNA 바코드 분석 및 Marker Nucleotide 발굴)

  • Kim, Wook Jin;Lee, Young Mi;Ji, Yunui;Kang, Young Min;Choi, Goya;Kim, Ho Kyoung;Moon, Byeong Cheol
    • The Korea Journal of Herbology
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    • v.29 no.6
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    • pp.35-43
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    • 2014
  • Objectives : Official Arisaematis Rhizoma is described only three species, Arisaema amurnse, Arisaema erubescens, and Arisaema heterophyllum, in national Pharmacopoeia. However, other Arisaema species, Arisaema ringens, Arisaema takesimense and Arisaema serratum, also have been distributed as an inauthentic Arisaematis Rhizoma in the herbal market. To develop a reliable molecular authentication method for Arisaematis Rhizoma in species level, we analyzed DNA barcode regions using six Arisaema species. Methods : Thirty-eight samples of six Arisaema plants species (A. amurense, A. amurense f. serratum, A. heterophyllum, A. takesimense, and A. serratum) were collected from different habitate and nucleotide sequences of DNA barcode regions (rDNA-ITS, matK, and rbcL gene) were analyzed after PCR amplification. The species-specific sequences and phylogenetic relations were estimated using entire sequences of three DNA barcodes based on the analysis of ClastalW and UPGMA, respectively. Results : The comparative analysis of DNA barcode sequences were revealed inter-species specific nucleotides to distinguish the medicinal plant of Arisaema Rhizoma in species levels excluding between A. amurense and its subspecies (A. amurense f. serratum) and A. takesimense and A. serratum, respectively. However, we obtained sequence differences enough to discriminate authentic and inauthentic Arisaematis Rhizoma. Therefore, we suggest that these SNP type molecular genetic markers were an reliable method avaliable to identify official herbal medicines. Conclusions : These marker nucleotides could be useful to identify the official herbal medicines by providing definitive information that can identify original medicinal plant and distinguish from inauthentic adulterants and substitutes.

Analysis of Significant Factor in the Flavor of Traditional Korean Soy Sauce (II) - Analysis of Nitrogen Compounds, Free Amino Acids and Nucleotides and Their Related Compounds - (한국전통간장의 맛과 향에 관여하는 주요 향미인자의 분석(II) - 질소 화합물, 유리아미노산 및 핵산관련물질 분석 -)

  • Park, Hyun-Kyung;Sohn, Kyung-Hee
    • Journal of the Korean Society of Food Culture
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    • v.12 no.1
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    • pp.63-69
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    • 1997
  • This study was carried out in order to analyzed the changes in nitrogen containing taste compounds of three different types of traditional Korean soy sauce with varing ripening period, and to investigates correlation between sensory characteristics and taste compounds contents via contents assay and sensory evaluation of soy sauce samples. Total nitrogen, ammonia type nitrogen and amino type nitrogen contents showed the highest value in Kyupjang. 17 kinds of free amino acid was detected in Chungjangs and 16 kinds of free amino acid was detected in Kyupjang. Nucleotides and their related compounds detected were hypoxanthin, xanthin, IMP, AMP, Inosine, ADP. Free amino acid and nucleotides and their related compounds contents were highest in Kyupjang. Nitrogen related compounds content of high concentration soy sauce ripened over 150 days increased similarly with Kyupjang. In the sensory evaluation of soy sauce taste, Chungjang samples acquired the highest score in the offensive taste test while Kyupjang marked highest score for sweet taste, nutty taste, taste preference. High concentration soy sauce ripend over 150 days yielded the result similar to that of Kyupjang. Sweet taste showed positive correlation with nitrogen compounds. The materials that showed positive correlation with nutty and traditional soy sauce taste and taste preference were nitrogen compound, IMP, AMP. Except for tryptophan, all free amino acid showed positive correlation with nutty and traditional soy sauce taste. Particulary, taste preference correlated to lysine, aspartic acid and glutamic acid.

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Changes of Nucleotides in the Raw Fishes during the Aquarium Storage (수족관 저장기간에 따른 횟감생선의 핵산관련성분 변화)

  • Hong, Cheul-Hee;Lee, Jeong-Min;Kim, Kyong-Su
    • Korean Journal of Food Science and Technology
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    • v.36 no.3
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    • pp.379-384
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    • 2004
  • Changes in nucleotide concentrations of aquarium-stored flounder, sea bass, and sea bream were studied. ATP, ADP, and AMP slowly decreased, whereas IMP, HxR and Hx slightly increased with increasing storage ported. ATP was converted into IMP at initial storage stage. Changes in concentrations of nucleotides differed depending on fish type and season. Freshness indicators, $K,\;K_{p}\;G,\;P,\;H,\;and\;F_{r}$ values during 14 days storage showed no significant differences. Changes in nucleotide concentrations during 14 days storage had no significant effect on taste of raw fishes.