• Title/Summary/Keyword: S-52

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SCFFBS1 Regulates Root Quiescent Center Cell Division via Protein Degradation of APC/CCCS52A2

  • Geem, Kyoung Rok;Kim, Hyemin;Ryu, Hojin
    • Molecules and Cells
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    • v.45 no.10
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    • pp.695-701
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    • 2022
  • Homeostatic regulation of meristematic stem cells accomplished by maintaining a balance between stem cell self-renewal and differentiation is critical for proper plant growth and development. The quiescent center (QC) regulates root apical meristem homeostasis by maintaining stem cell fate during plant root development. Cell cycle checkpoints, such as anaphase promoting complex/cyclosome/cell cycle switch 52 A2 (APC/CCCS52A2), strictly control the low proliferation rate of QC cells. Although APC/CCCS52A2 plays a critical role in maintaining QC cell division, the molecular mechanism that regulates its activity remains largely unknown. Here, we identified SCFFBS1, a ubiquitin E3 ligase, as a key regulator of QC cell division through the direct proteolysis of CCS52A2. FBS1 activity is positively associated with QC cell division and CCS52A2 proteolysis. FBS1 overexpression or ccs52a2-1 knockout consistently resulted in abnormal root development, characterized by root growth inhibition and low mitotic activity in the meristematic zone. Loss-of-function mutation of FBS1, on the other hand, resulted in low QC cell division, extremely low WOX5 expression, and rapid root growth. The 26S proteasome-mediated degradation of CCS52A2 was facilitated by its direct interaction with FBS1. The FBS1 genetically interacted with APC/CCCS52A2-ERF115-PSKR1 signaling module for QC division. Thus, our findings establish SCFFBS1-mediated CCS52A2 proteolysis as the molecular mechanism for controlling QC cell division in plants.

Control of histamine-forming bacteria by probiotic lactic acid bacteria isolated from fish intestine (생선 내장으로부터 분리된 프로바이오틱 유산균에 의한 히스타민 생산균의 제어)

  • Lim, Eun-Seo;Lee, Nahm-Gull
    • Korean Journal of Microbiology
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    • v.52 no.3
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    • pp.352-364
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    • 2016
  • In this study, we examined in vitro the potential probiotic properties of lactic acid bacteria (LAB) obtained from the fish intestine and their ability to degrade histamine through the production of diamine oxidase (DAO) enzymes and bacteriocin. Among 97 LAB strains isolated from the intestine of croaker, flatfish, pollack, and rockfish, CIL08, CIL16, FIL20, FIL31, PIL45, PIL49, PIL52, and RIL60 isolates exhibited excellent survival rates under simulated gastrointestinal tract conditions, high adhesion ability to HT-29 epithelial cells, and resistance to the antibiotics such as amoxicillin, ampicillin, erythromycin, penicillin G, streptomycin, tetracycline, or vancomycin. In addition, these strains did not produce histamine in decarboxylating broth containing histidine. In particular, 4 strains (CIL08, FIL20, PIL52, and RIL60) that may produce DAO were significantly able to degrade histamine. The bacteriocins produced by FIL20, FIL31, and PIL52 LAB inhibited the growth and histamine production of Enterococcus aerogenes CIH05, Serratia marcescens CIH09, Enterococcus faecalis FIH11, Pediococcus halophilus FIH15, Lactobacillus sakei PIH16, Enterococcus faecium PIH19, Leuconostoc mesenteroides RIH25, or Aeromonas hydrophilia RIH28. Histamine-producing strains isolated from fish intestine were found to reduce histamine accumulation during co-culture with CIL08, FIL20, PIL52, and RIL60 LAB showing histamine degradation or bacteriocin production ability. The probiotic strains preventing histamine formation were identified as Pediococcus pentosaceus CIL08, Lactobacillus plantarum FIL20, Lactobacillus paracasei FIL31, Lactobacillus sakei PIL52, and Leuconostoc mesenteroides RIL60 with high similarity based on 16S rRNA gene sequencing.

해외소식

  • 한국오리협회
    • Monthly Duck's Village
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    • s.99
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    • pp.52-53
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    • 2011
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해외소식

  • 한국오리협회
    • Monthly Duck's Village
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    • s.112
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    • pp.52-55
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    • 2012
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기관소식

  • 한국오리협회
    • Monthly Duck's Village
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    • s.163
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    • pp.52-55
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    • 2017
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축산소식

  • 한국오리협회
    • Monthly Duck's Village
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    • s.176
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    • pp.52-55
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    • 2018
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축산소식

  • 한국오리협회
    • Monthly Duck's Village
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    • s.121
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    • pp.52-55
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    • 2013
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기관소식

  • 한국오리협회
    • Monthly Duck's Village
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    • s.173
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    • pp.52-55
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    • 2017
  • PDF