• Title/Summary/Keyword: Macrolide

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Cloning of Inducible MLS Antibiotics Resistance Genes and their Expression Control Mechanism - ermC-4, a macrolide-lincosamide-streptogramin B resistance determinant on pMB4 from Staphylococcus aureus TR-1 (MLS계 항생물질 유도내성 유전자의 크로닝과 유전자의 발현조절 기전 - Staphylococus aureus TR-1균주의 프라스미드 pMB4에 존재하는 MLS 내성 유전자 ermC-4)

  • 김수환;최응칠;김병각;심미자
    • YAKHAK HOEJI
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    • v.35 no.1
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    • pp.22-29
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    • 1991
  • pMB4 is a 2.4-kilobase plasmid of Staphylococcus aureus TR-1 that confers inducible resistance to the macrolide-lincosamide-streptogramin B(MLS) antibiotics. By subcloning studies, it was found that the MLS resistance determinant was located at 1.0Kb fragment between Sau3AI and TaqI sites. DNA sequence of the MLS resistant determinant, named ermC-4 was determined, and found to be highly homologous with that of ermC. Because the leader peptide sequence of ermC-4 was identical with that of ermC, the expression of the resistance gene is thought to be controlled by posttranscriptional attenuation in S. aureus TR-1.

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PC-766B' and PC-766B, 16-Membered Maerolide Angiogenesis Inhibitors Produced by Nocardia sp. RK97-56

  • Ko, Hack-Ryong;Kakeya, Hideaki;Yoshida, Arika;Onose, Rie;Ueki, Masashi;Muroi, Makoto;Takatsuki, Akira;Matsuzaki, Hiroshi;Osada, Hiroyuki
    • Journal of Microbiology and Biotechnology
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    • v.12 no.5
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    • pp.829-833
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    • 2002
  • Angiogenesis is an essential event in a variety of physiological and pathological processes. Therefore, effective inhibition of this event is a promising strategy for treating angiogenesis-related diseases, including cancer. The current study investigated two unique bafilomycin-type macrolide inhibitors of angiogenesls, PC-766B' (1) and PC-766B (2). The strain RK97-56 which produced the inhibitors was identified as Nocardia sp. by chemotaxonomic analyses, and the purification of the inhibitors was guided by their anti-angiogenic activities. PC-766B' (1) and PC-766B (2) exhibited potent inhibitory activities towards endothelial cell migration stimulated by the vascular endothelial growth factor (VEGF).

The Structure Determination of a Herbicidal Compound, 3D5

  • Kim, Shin-Duk;Ryoo, In-Ja;Kim, Chang-Jin;Uramoto, Masakazu;Yoo, Ick-Dong
    • Journal of Microbiology and Biotechnology
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    • v.3 no.1
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    • pp.51-56
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    • 1993
  • The structure of herbicidal compound, 3D5, isolated from the culture broth of Streptomyces sp. 3D5, was elucidated as a 16-membered diene macrolide by the spectroscopic method. It was identical with bafilomycin D which has been known to be an insecticidal compound and an inhibitor of $K^{+}-dependent$ ATPase. However, this is the first report which shows that bafilomycin D has a herbicidal activity.

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Exacerbation Prevention and Management of Bronchiectasis

  • Joon Young Choi
    • Tuberculosis and Respiratory Diseases
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    • v.86 no.3
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    • pp.183-195
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    • 2023
  • Bronchiectasis, which is characterized by irreversibly damaged and dilated bronchi, causes significant symptoms, poor quality of life, and increased economic burden and mortality rates. Despite its increasing prevalence and clinical significance, bronchiectasis was previously regarded as an orphan disease, and ideal treatment of this disease has been poorly understood. The European Respiratory Society and British Thoracic Society have recently published guidelines to assist physicians in the clinical field. Guidelines and reports suggest comprehensive management that includes both non-pharmacological and pharmacological treatment. Physiotherapy and pulmonary rehabilitation are two of the most important non-pharmacologic therapies in bronchiectasis patients; long-term inhaled antibiotics and macrolide therapy have gained significant evidence in reducing exacerbation risk in frequent exacerbators. In this review, we summarize recent updates on bronchiectasis treatment to prevent exacerbation and manage clinical deterioration.