• 제목/요약/키워드: Restriction endonuclease DNA analysis

검색결과 45건 처리시간 0.021초

Southern Hybridization에 의한 Biphenyl 및 4-Chlorobiphenyl 분해유전자들의 상동성 분석 (Homology Analysis Among the Biphenyl and 4-Chlorobiphenyl Degrading Genes by Southern Hybridization)

  • 남정현;김치경;이재구;이길재
    • 한국미생물·생명공학회지
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    • 제22권1호
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    • pp.37-44
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    • 1994
  • The homology among the genes coding for degradation of bipheny(BP) and 4-chlorobiphenyl(4CB) was comparatively analyzed by Southern hybridization in several BP/4CB degrading bacterial strains. As the hybridization results of their genomic DNAs with pcbABCD as the DNA probe, the group of Pseudomonas sp. DJ-12. P08 and P27 strain was separated by the group of P20 and P1242 strains. The P. pseudoalcaligenes KF707 showed the hybidization signal which was homologous to the group of DJ-12, but they had different restriction endonuclease sites. The pcbAB genes in pCUl recombinant plasmid from Pseudomonas sp. DJ-12 appeared to be homologous to pchAB genes in pKTF20 cloned from P. pseudoalcaligenes KF707, but the C genes in both strains were not homologous. The bphABC in pKTF20 showed the signals homologous to the cbp ACB in pAW6194 cloned from P. putida OU83, but homologous signal was not found botween the pcbABCD genes in pCUl and the cbpADCB genes in pAW6194 recombbinant plasmid.

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Analysis of the Genome of Symbiobacterium toebii by Pulsed-Field Gel Electrophoresis

  • Hong, Seung-Pyo;Park, Jong-Hoon;Kim, Yong-Seung;Hwang, Hae-Jun;Rhee, Sung-Keun;Lee, Seung-Goo;Sung, Moon-Hee;Esaki, Nobuyoshi
    • Journal of Microbiology and Biotechnology
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    • 제10권3호
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    • pp.405-409
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    • 2000
  • We have studied the genome of an obligately commensal thermophile, Symbiobacterium toebii. The chromosome was extracted from pure cultures of S. toebii recently established. Total DNA of S. toebii was resolved by pulsed-field gel electrophoresis (PFGE) into discrete numbers of fragments by digenstion with the endonuclease SspI, SpeI, XbaI, and HpaI. Estimated sizes of fragments produced by the four enzymes and their sum consistently yielded a total genome size of 2.8 Mb. Because restriction endonucleases NotI and SwaI, recognizing 8 bp, released too many fragments, these enzymes could not be used for the estimation of the genome size. Considering no mobility of undigested genome under PFGE, the genome of S. toebii appears to be circular. The presence of extrachromosomal DNA in S. toebii was excluded by the results of the conventional 1% agarose gel electrophoresis and the field inversion gel electrophoresis of undigested S. toebii DNA.

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Improvement of Transformation Efficiency Through In Vitro Methylation and SacII Site Mutation of Plasmid Vector in Bifidobacterium longum MG1

  • Kim, Jin-Yong;Wang, Yan;Park, Myeong-Soo;Ji, Geun-Eog
    • Journal of Microbiology and Biotechnology
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    • 제20권6호
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    • pp.1022-1026
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    • 2010
  • The different cleavage patterns of pYBamy59 plasmid isolated from E. coli $DH5{\alpha}$ and B. longum MG1 by the cell extract of B. longum MG1 suggested that the main reason for its low transformation efficiency was related to the restriction modification (R-M) system. To confirm the correlation between the R-M system and transformation efficiency, in vitro methylation and site-directed mutagenesis were performed in pYBamy59. Sequence analysis of pYBamy59 fragments digested by the cell extract of B. longum MG1 revealed that all fragments were generated by restriction of the sequence recognized by SacII endonuclease. When pYBamy59 from E. coli was methylated in vitro by CpG or GpC methyltransferase, it was protected from SacII digestion. Site-directed mutagenesis, which removed SacII sites from pYBamy59, or in vitro methylation of pYBamy59 showed 8- to 15-fold increases in the transformation efficiency over intact pYBamy59. Modification of the SacII-related R-M system in B. longum MG1 and in vitro methylation in pYBamy 59 can improve the transformation efficiency in this strain. The results showed that the R-M system is a factor to limit introduction of exogenous DNA, and in vitro modification is a convenient method to overcome the barrier of the R-M system for transformation.

Molecular Investigation of Two Consecutive Nosocomial Clusters of Candida tropicalis Candiduria Using Pulsed-Field Gel Electrophoresis

  • Park, Joon;Shin, Jong-Hee;Song, Jeong-Won;Park, Mi-Ra;Kee, Seung-Jung;Jang, Sook-Jin;Park, Young-Kyu;Suh, Soon-Pal;Ryang, Dong-Wook
    • Journal of Microbiology
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    • 제42권2호
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    • pp.80-86
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    • 2004
  • Pulsed-field gel electrophoresis (PFGE) typing was applied to the epidemiological investigation of 21 Candida tropicalis isolates collected from urine specimens of 11 patients and one healthcare worker, in an intensive care unit (ICU) over a 4-month period. Seventeen epidemiologically unrelated strains from 14 patients were also tested to determine the discriminatory power of PFGE. PFGE typing consisted of electrophoretic karyotyping (EK) and restriction endonuclease analysis of genomic DNA (REAG), using two restriction enzymes (BssHII and SfiI). The EK pattern was the same in all 38 isolates, while REAG using SfiI separated the isolates into nine types. However, 16 different PFGE types were iden-tified by REAG with BssHII, and the same results were obtained when the results of both REAG tests were combined. In serial urinary isolates from 10 patients, all strains from each patient had the same PFGE pattern. While the epidemiologically unrelated strains from 14 patients consisted of 13 different PFGE types, the 20 isolates from the 11 ICU patients fell into only two PFGE types (types Cl and C2), and these apparently originated from the two different outbreaks. All strains of type Cl (n = 12) were isolated from six patients, between November 1999 and January 2000, and all of the type C2 strains (n=8) were isolated from five patients, during January and February 2000. This study shows two con-secutive clusters of C. tropicalis candiduria in an ICU, defined by PFGE typing, and also demonstrates that a PFGE typing method using BssHII is perhaps the most useful method for investigating C. tropi-calis candiduria.

닭의 성특이적 DNA 분리 (Identification of Sex-Specific DNA Sequences in the Chicken)

  • 송기덕;신영수;한재용
    • 한국가금학회지
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    • 제20권4호
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    • pp.177-188
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    • 1993
  • 닭에서 적절한 성감별 방법을 개발하고 닭의 성분화 기작의 기초자료를 얻기 위하여 배아의 섬유아세포의 염색체를 분석하고, W 염색체 특이적인 반복염기서열과 50∼60%의 유사성을 보이는 random primer로 PCR 증폭을 실시하여 성을 판별하는 방법이 이용되었으며, 닭에서 성분화에 관련된 유전자를 분리하기 위해 W 염색체 특이적인 반복염기서열을 클로닝하였고, PCR을 이용하여 ZFY와 SRY 염기서열을 증폭하였다. 닭의 배아섬유세포의 염색체 분석 결과 Z 염색체와 W 염색체를 구분함으로써 배아의 성을 직접적으로 판별하는 것이 가능하였으며 , 암닭의 DNA를 Xho Ⅰ와 Eco RI로 절단하여 생성되는 band를 이용하여 성을 판별하는 것이 가능하였다. Xho Ⅰ와 Eco RI family를 클로닝하고, colony hybridization을 통해 Xho Ⅰ과 염기서열이 유사한 80∼100개의 clone을 동정하여, 이들 두 그룹간 DNA homology는 매우 유사하였다. 150개의 random primer 중 W 염색체 특이적인 반복 염기서열과 유사성을 보이는 primer 7개를 screening하였으며, 이 중 3개의 primer는 닭에서 자성과 웅성간의 차이를 나타내었다. 닭에서 성분화에 관련된 유전자를 동정하기 위하여 포유류의 ZFY와 SRY유전자의 PCR증폭을 실시하였다. ZFY를 증폭한 결과, 자성과 웅성간의 차이를 발견할 수 없었으며, 이는 닭에서 ZFY는 상염색체 또는 Z 염색체에 존재함을 시사한다. SRY의 증폭에서는 성간의 차이가 확인되었으나, 이 유전자가 Z 염색체에 존재하는지 W 염색체에 존재하는지 혹은 상염색체 존재하는지 여부는 연구가 필요하리라 사료된다.

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Three-step PCR and RFLP Genotyping of the Swine Ryanodine Receptor Gene Using Aged Single Hair Follicles Delivered by General Mail

  • Kim, Y.;Woo, S.C.;Song, G.C.;Park, H.Y.;Im, B.S.;Kim, G.W.
    • Asian-Australasian Journal of Animal Sciences
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    • 제15권9호
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    • pp.1237-1243
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    • 2002
  • We have developed a reliable and noninvasive method for swine genotyping of single locus nuclear gene with aged single hair follicles delivered by general mail. The method is based on booster and nested PCR amplification with step-wise increase of primers and dNTPs concentrations followed by restriction endonuclease digestion. To establish this method, the ryanodine receptor (RYR 1) locus which is an economically important trait in swine industry was employed for genotyping experiment. The 3-step PCR amplication method is much less dependent on the quantity and quality of template DNA and produces enough amplification product for the detection on the ethidium bromide-stained gel such as RFLP analysis. A total of 120 pigs were subjected to the RYR 1 genotyping analysis using three-step PCR method which amplified enough quantity of PCR products from the aged single hair follicles for RFLP analysis and genotyping results were identical to the results of the corresponding ethanol-fixed skeletal muscle tissue. This approach will be a great help for porcine breeders and investigators in genotyping of swine. They can receive genotyping results later by simply plucking single hairs of their pigs at farm and sending them in general mail to the diagnostic laboratory which eliminates the inconveniences to collect ear tissue or blood cells from pigs, or the investigator's need for travel to farms in order to collect fresh hair samples.

국산 포도로부터 분리한 야생효모의 동정 및 특성 (Identification and Characterization of Wild Yeasts Isolated from Korean Domestic Grape Varieties)

  • 최상훈;홍영아;최윤정;박희동
    • 한국식품저장유통학회지
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    • 제18권4호
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    • pp.604-611
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    • 2011
  • 본 연구에서는 국산 포도로부터 분리된 효모들 중 와인 발효 적성이 우수한 균주들을 선정하여 ITS-I-5.8S-ITS II DNA 염기서열 분석과 분자생물학적인 방법을 통하여 동정하였고 발효환경 내성을 알아보았다. 분리 효모들의 ITS I-5.8S-ITS II 영역을 PCR로 증폭한 결과 약 800bp의 DNA가 증폭됨을 확인하였다. 이 DNA를 제한효소 HaeIII로 처리한 경우 모두 약 400bp의 DNA band 확인되었고, Hinf I로 처리한 경우에는 약 350 bp와 300 bp의 DNA band를 나타내었다. 분리된 4 균주의 염색체 DNA를 PFGE로 확인한 결과 MM10, WW108 그리고 SS89(SS812 동일)가 서로 다른 3가지 염색체 패턴을 나타내었다. ITS I-5.8S-ITS II DNA 염기서열을 분석한 결과 모두 S. cerevisiae CBS 4054 표준균주와 97% 이상의 상동성을 나타내어 매우 가까운 근연관계에 있음을 알 수 있었다. 근린결합분석을 이용한 phylogenetic 분석을 통하여 분리 균주인 MM10, SS89, SS812 그리고 WW108 균주는 S. cerevisiae CBS 4054 표준 균주와 계통 유연관계에서 매우 가까운 위치에 있는 것을 확인할 수 있었다. 동정된 4종의 야생효모 중 200 ppm의 아황산 함유 배지에서 MM10과 WW108 균주는 24시간대에서 6% 미만의 생육 저해률을 보였다. 또한 $30^{\circ}C$ 배양온도에서 30% 포도당을 함유하는 YPD 배지에서 36시간대에서 가장 높은 성장을 나타내었으며, 특히 SS89 균주는 660 nm에서의 흡광도가 약 40에 가까운 수치를 나타내었다. 배양온도 $40^{\circ}C$에서는 모든 효모군이 10~15의 수치를 나타내어 낮은 성장을 나타내었다. 알코올(8%, v/v)을 함유하는 YPD 배지에서 배양초기에는 내성이 약하였으나 배양이 진행되면서 적응을 하기 시작하고 24시간대에서 가장 낮은 생육 저해률을 보였다.

반복배열된 토마토 phenylalanine ammonia-Iyase(p AL X1, PAL X2) 유전자의 구조해석 (Structural Analysis of Repeated Tomato Phenylalanine Ammonia-Lyase Gene (PAL X1, PAL X2))

  • 이신우;여윤수
    • Applied Biological Chemistry
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    • 제42권1호
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    • pp.34-38
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    • 1999
  • 토마토의 genome내에는 적어도 5개 이상의 PAL유전자 좌가 존재한다는 사실을 이 등(1992)이 이미 genomic Southern blot hybridization으로 확인하여 보고하였다. 그러나 본 연구에서 제작한 genomic DNA libraries를 대상으로 검색한 결과 기존에 보고된 PAL유전자 이외에 약 15 kb 와 10 kb에 해당하는 큰 EcoRI 단편을 확보 할 수 있었다. 이들 단편을 BamHI, HindIII등 9종의 제한효소를 사용하여 Southern blot hybridization을 행한 결과 PAL X1의 경우는 모든 효소에 대하여 2개의 단편이 hybridization 되었으며, 특히 BamHI으로 절단하여 얻은 3개의 단편중 두 개는 PAL5 유전자의 exon 2 부위에서 취한 oligomer(18 mer)와 primer extension 반응이 진행되어서 약 200 bp의 PAL유전자와 아주 높은 상동성을 갖는 염기서열이 확인되었다. 따라서 PAL X1유전자는 2 copy의 유전자가 나란히 존재하거나 아니면 염색체 재배열이 진행된 것으로 추정된다. 이러한 결과는 적어도 7개 이상의 PAL유전자 좌가 토마토 염색체내에 존재하는 것으로 사료된다.

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In Silico Structural and Functional Annotation of Hypothetical Proteins of Vibrio cholerae O139

  • Islam, Md. Saiful;Shahik, Shah Md.;Sohel, Md.;Patwary, Noman I.A.;Hasan, Md. Anayet
    • Genomics & Informatics
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    • 제13권2호
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    • pp.53-59
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    • 2015
  • In developing countries threat of cholera is a significant health concern whenever water purification and sewage disposal systems are inadequate. Vibrio cholerae is one of the responsible bacteria involved in cholera disease. The complete genome sequence of V. cholerae deciphers the presence of various genes and hypothetical proteins whose function are not yet understood. Hence analyzing and annotating the structure and function of hypothetical proteins is important for understanding the V. cholerae. V. cholerae O139 is the most common and pathogenic bacterial strain among various V. cholerae strains. In this study sequence of six hypothetical proteins of V. cholerae O139 has been annotated from NCBI. Various computational tools and databases have been used to determine domain family, protein-protein interaction, solubility of protein, ligand binding sites etc. The three dimensional structure of two proteins were modeled and their ligand binding sites were identified. We have found domains and families of only one protein. The analysis revealed that these proteins might have antibiotic resistance activity, DNA breaking-rejoining activity, integrase enzyme activity, restriction endonuclease, etc. Structural prediction of these proteins and detection of binding sites from this study would indicate a potential target aiding docking studies for therapeutic designing against cholera.

저온성균 Sporosarcina psychrophilia로부터 Aspartate Transcarbamylase 유전자의 클로닝 및 염기서열 분석 (Molecular Cloning and Nucleotide Sequence Analysis of pyrB Gene Encoding Aspartate Transcarbamylase from Psychrophilic Sporosarcina psychrophilia)

  • 성혜리;안원근;김사열
    • 한국미생물·생명공학회지
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    • 제30권4호
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    • pp.312-319
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    • 2002
  • 저온성 균인 Sporosarcina psychrophilia의 염색체 DNA를 추출하여 Sau3AI으로 부분 절단하고 pUC19 vector에 ligation 시킨 후, Escherichia coli pyrB mutant 균주에 형질전환하여 uracil이 없는 AB배지에서 생존하는 균주를 선택한 후, 그 plasmid를 분리하여 pSMI과 pSM2라고 명명하였다. 두 plasmid의 염기배열을 결정한 결과 pSM2 insert DNA는 pSMl insert DNA 부분을 포함하는 2,606 nucleotide 단편이었다. 염기서열을 분석하였을 때 이것은 1개의 완전한 open reading frame(ORF)과 2개의 부분 ORFs를 포함하고 있었다. 두 번째 위치한 완전한 ORF는 Bacillus caldolyticus aspartate transcarbamylase(pyrB)와 아미노산 서열 수준에서 59% 상동성을 보였고, 첫 번째와 세 번째 위치한 부분적 ORFs는 각각 Bacillus속의 uracil permease(pyrP)와 dihydoorotase(pyrC)와 높은 상동성을 보였다. 그리고 pyrB와 pyrP사이에 intergenic 부분에는 잠재적인 terminator, antiterminator, anti-antiterminator 구조를 포함하고 있었다. 이러한 결과는 S. psychrophilia pyrimidine 생합성에 관련된 유전자들은 다른 Bacillus속에서 알려진 바와 같이 유전자군을 형성하고 있을 것으로 추정했다. S. psychrophilia pyrB 유전자의 생성물을 과다발현 시키고 정제해서 그 단백질을 SDS-PAGE로 확인한 결과 27 kDa 부근에서 band를 확인할 수 있었으며, 정제한 단백질도 ATCase 효소활성을 지니고 있었다.