• 제목/요약/키워드: Synechocystis sp.

검색결과 57건 처리시간 0.03초

중금속, 제초제 및 항생제 검출용 남세균 유래 바이오 리포터 (Cyanobacterial bioreporters for detection of heavy metals, herbicide, and antibiotics)

  • 김수연;정원중;서계홍;유장렬;박연일
    • Journal of Plant Biotechnology
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    • 제35권2호
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    • pp.141-145
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    • 2008

  • 본 연구는 남세균 고유의 프로모터를 포함하는 유전자간 염기서열에 기반하여 환경위해성 검출용 바이오센서를 개발하고자 시도되었다. 포도당 처리에 의해서 유도되는 8종의 유전자 (atpI, ndbA, ctaD1, tkt, pgi, pdh, ppc, 그리고 rydA)의 프로모터 부위를 리포터 유전자의 일종인 발광유전자 (luxAB) 벡터 pILA (Genbank: AJ251840)에 도입시켜 재조합 벡터를 제조한 후 Synechocystis sp. PCC6803을 형질전환시킨 결과, pILA 벡터만을 포함하고 있는 대조구에 비해서 포도당 처리에 의해서 생물발광량이 5-25배 정도 현저히 증가함을 확인하였다. 또한 $Hg^{2+}$, $Cu^{2+}$, $Zn^{2+}$과 같은 중금속, $CN^-$, DCMU, DBMIB와 같은 제초제, 그리고 클로람페니콜이나 리팜피신과 같은 항생제에 의해서 생물발광이 현저히 억제되었다.

  • https://doi.org/10.5010/JPB.2008.35.2.141 인용 PDF KSCI

A Small Cryptic Plasmid pZMO1 of Zymomonas mobilis ATCC10988

  • Kang, Hyung-Lyun;Kang, Hyen-Sam
    • Genomics & Informatics
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    • 제1권1호
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    • pp.55-60
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    • 2003

  • The nucleotide sequence of pZMO1, a small cryptic plasmid of Zymomonas mobilis ATCC10988 was determined. Analysis of 1,680 bp of sequence revealed $69\%$ identity with Shigella sonnei plasmid, pKYM and $61\%$ identity with Nostoc sp. ss DNA replicating plasmid. Analysis of a deduced amino acid sequence of an orf of pZMO1 revealed $75\%$ identity and $90\%$ similarity with the repA gene of Synechocystis sp. plasmid pCA2.4. The upstream region of the repA gene of pZMO1 possesses six directed repeat sequences and two inverted repeat sequences at downstream of the IR consensus sequence of nick region of rolling circle replication (RCR) plasmid. A typical terminator hairpin structure was found at the downstream region of repA gene. Degradation of single-stranded plasmid DNA by S1 nuclease was detected by Southern hybridization. It suggests that pZMO1 replicates by a rolling circle mechanism in Z. mobilis ATCC10988 cells.

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A NOVEL PHOTOHETEROTROPHIC MUTANT FOR psaB GENE OF Synechocystis sp. PCC 6803 GENERATED FROM TARGETED MUTAGENESIS

  • Kim, Soohyun;Kim, Seung-Il;Choi, Jong-Soon;Chung, Young-Ho;Chun, Soon-Bai;Park, Young-Mok
    • Journal of Photoscience
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    • 제3권1호
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    • pp.23-28
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    • 1996

  • To investigate the structure and function of photosystem I, cartridge mutagenesis technique was used to inactivate the psaB gene of photosystem I. From the screen, many strains which have potential defects in photosystem I were generated. Biochemical analysis revealed that B2, one of the mutant, had a reduced amount of chlorophyll. Electron transfer activitx from photosystem II to photosystem I as oxygen uptake was the rate of 64 % of wild type. Also B2 showed a decreased photosystem I activity when measured by 77 K fluorescence emission spectrum. Particularly, immunodetection analysis showed that the B2 had reduced amount of PsaA/PsaB, but a normal range of PsaC and PsaD. Here we present a photoheterotrophic mutant for psaB gene as a unique model strain for future study of structural/functional relationship and biogenesis of photosystem I.

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Molecular Regulation of Pyrimidine Nucleotide Synthesis in Bacterial Genomes

  • Ghim, Sa-Youl
    • 한국미생물생명공학회:학술대회논문집
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    • 한국미생물생명공학회 2001년도 Proceedings of 2001 International Symposium
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    • pp.165-168
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    • 2001

  • Regulation of pyrimidine nucleotide synthesis has been studied extensively in enteric bacteria and Bacillus species. Varieties of control modes have been proposed for regulation of pyrimidine nucleotide biosynthetic (pyr) genes. In Bacillus caldolyticus and B. subtilis, it has been proved that pyrimidine de novo biosynthetic operon is controlled by a regulatory protein PyrR-mediated attenuation. Another Gram-positive bacteria including Enterococcus faecalis, Lactobacillus plantarum, and wctococcus lactis have been found to constitute a pyr gene cluster containing the pyrR gene. In addition, it has been proposed that the structure of the 5' leader region of the Gram-negative extreme thermophile Thermus strain Z05 pyr operon provides a novel mechanism of PyrR-dependent coupled transcription-translation attenuation. Bacterial genome sequencing projects have identified the PyrR homologues in Haemophilus influenzae, Synechocystis sp., Mycobacterium tuberculosis, Streptococcus pneumoniae, S. pyogenes, and Clostridium acetobutylicum, which are currently investigating for their physiological functions.

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