• 제목/요약/키워드: L.brevis

검색결과 213건 처리시간 0.021초

Expression of Alpha-Amylase Gene from Bacillus licheniformis in Lactobacillus brevis 2.14

  • Lee, Kang-Wook;Park, Ji-Yeong;Kim, Gyoung-Min;Kwon, Gun-Hee;Park, Jae-Yong;Lee, Mee-Ryung;Chun, Ji-Yeon;Kim, Jeong-Hwan
    • Preventive Nutrition and Food Science
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    • 제13권3호
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    • pp.190-195
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    • 2008
  • The $\alpha$-amylase gene, amyL, from Bacillus licheniformis was expressed in Lactobacillus brevis 2.14 and Escherichia coli $DH5{\alpha}$ using two different shuttle vectors, pCW4 and pSJE. E. coli transformants (TFs) harboring either $pCW4T{\alpha}$ or $pSJET{\alpha}$ produced active $\alpha$-amylase but L. brevis TFs did not, as determined by enzyme assays and zymography. But amyL transcripts were synthesized in L. brevis TFs. In terms of plasmid stability, pSJE, a theta-type replicon, was more stable than pCW4, an RCR (rolling circle replication) plasmid, in L. brevis without antibiotic selection.

Lactobacillus brevis DK25의 박테리오신과 안식향산칼륨과의 혼용에 의한 Hurdle Technology 적용 가능성 (Application Potential of Hurdle Technology by Combination of Bacteriocin Produced by Lactobacillus brevis DK25 and Potassium Benzoate)

  • 임성미
    • 미생물학회지
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    • 제47권4호
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    • pp.364-374
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    • 2011
  • 동치미에서 분리된 Lactobacillus brevis DK25 균주는 생화학적 특성, 당 분해능 및 16S rDNA 염기서열 분석을 통해 동정하였다. L. brevis DK25가 생산한 박테리오신의 항균활성은 Enterococcus faecalis와 Listeria monocytogenes에 대해서만 나타나 항균 스펙트럼은 비교적 좁은 것으로 확인되었다. 배양과정 동안 L. brevis DK25의 박테리오신은 정지기 초기에 최대의 활성(1,280 AU/ml)을 나타내었으나, 그 이후에는 급격하게 감소되었으므로 박테리오신은 생산균이 증식하는 과정 동안 생성됨을 알 수 있었다. 박테리오신의 활성은 protease 처리에 의해 완전히 소실되었으나 pH 4-9의 범위에서는 활성에 변함이 없었고, $100^{\circ}C$에서 30분간 가열처리에도 활성을 유지하였으므로 열에 비교적 안정하였다. 박테리오신의 L. monocytogenes KCTC 3569에 대한 항균활성은 농도의존적으로 나타났고 특히, $4^{\circ}C$$25^{\circ}C$에 저장하는 동안 마요네즈 내에 존재하는 L. monocytogenes KCTC 3569의 증식을 억제하기 위해선 박테리오신과 안식향산칼륨 용액을 단독으로 처리하는 것보다는 이들을 혼합하여 처리했을 때 유의적으로 더 높은 항균 효과를 얻을 수 있었다. 따라서 L. brevis DK25가 생산한 박테리오신은 안식향산칼륨과 함께 식품의 제조 공정 중 식중독균 제어를 위해서 hurdle technology에 적용될 수 있다고 판단된다.

Expression of ${\alpha}$-Galactosidase Gene from Leuconostoc mesenteroides SY1 in Lactobacillus brevis 2.14

  • Lee, Kang-Wook;Park, Ji-Yeong;Park, Jae-Yong;Chun, Ji-Yeon;Kim, Jeong-Hwan
    • Food Science and Biotechnology
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    • 제17권5호
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    • pp.1115-1118
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    • 2008
  • ${\alpha}$-Galactosidase gene (aga) from Leuconostoc mesenteroides SY1 was expressed in a heterologous host, Lactobacillus brevis 2.14 using an Escherichia coli-Leuconostoc shuttle vector, pSJE. pSJEaga (pSJE carrying aga) was introduced into Lactobacillus brevis 2.14 by electroporation and transformation efficiency was $1.1{\times}10^3$ per ${\mu}g$ DNA. L. brevis transformants (TFs) showed higher ${\alpha}$-galactosidase (${\alpha}$-Gal) activities than cells containing pSJE. Transcription levels of aga in L. brevis 2.14 grown on different carbon sources (1%, w/v) were examined by slot blot analysis. Aga transcript levels and ${\alpha}$-Gal activities were higher in cells grown on melibiose, raffinose, and galactose than cells on glucose, sucrose, and fructose. Western blot result showed that L. brevis 2.14 harboring pSJEaga produced much more ${\alpha}$-Gal when grown on melibiose than on glucose.

The Synergic Anti-inflammatory Impact of Gleditsia sinensis Lam. and Lactobacillus brevis KY21 on Intestinal Epithelial Cells in a DSS-induced Colitis Model

  • Kim, Younghoon;Koh, Ji Hoon;Ahn, Young Jun;Oh, Sejong;Kim, Sea Hun
    • 한국축산식품학회지
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    • 제35권5호
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    • pp.604-610
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    • 2015
  • We investigated the synergic anti-inflammatory activity of Gleditsia sinensis Lam. (GS) extract and Lactobacillus brevis KY21 both in vitro and in vivo. Western blot analysis and immunostaining showed that AKT phosphorylation that increased by the exposure of LPS were significantly decreased by the presence of either GS extract or L. brevis KY21. In addition, p65 intracellular transport was critically inhibited by GS extract and L. brevis KY21. We further studied these effects using an in vivo dextran sulfate sodium (DSS)-induced mouse model. Body weight, food intake, and clinical scores were dramatically decreased after treatment with DSS, whereas these effects were palliated by the addition of GS extract and L. brevis KY21. Importantly, transcription of genes encoding pro-inflammatory cytokines including IL-1β, TNF-α, and IFN-γ in mesenteric lymph nodes (MLN) and the spleen were increased by DSS treatment, whereas they were inhibited by the presence of GS extract and L. brevis KY21.

감잎 추출물의 유산균 생육 및 항산화 효과에 관한 연구 (Studies on Antioxidative Effect and Lactic Acid Bacteria Growth of Persimmon Leaf Extracts)

  • 우준영;백남수;김영만
    • 한국식품영양학회지
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    • 제18권1호
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    • pp.28-38
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    • 2005
  • 본 연구는 감잎 추출물을 이용하여 L. acidophilus MG501, L. brevis MG19, L. bulgaricus MG515, L. lactis MG530, L. casei MG311 균종에 대한 생육조건 및 동결건조 보호제로서의 효과, 가혹조건에서의 경시변화, vitamin C 함량 변화, DPPH 라디칼 소거효과, SOD 유사활성을 조사하였다. 유산균 생육은 L. acidophilus MG501, L. brevis MG19, L. bulgaricus MG515, L. lactis MG530, L. casei MG311에서 각각 37℃/48hr 동안 배양한 후 3.2×10/sup 9/cfu/mL, 2.9×10/sup 9/cfu/mL, 1.1×10/sup 9/cfu/mL, 1.6×10/sup 9/cfu/mL, 3×10/sup 9/cfu/mL 생균수을 나타냈으며 pH는 3.82∼3.88, 산도는 1.697∼l.842를 나타내었다. 반면에 감잎추출물 10% 첨가에 4.4×10/sup 9/cfu/mL, 4.3×10/sup 9/cfu/mL, 2×10/sup 9/cfu/mL, 3.3×10/sup 9/cfu/mL, 3.4×10/sup 9/cfu/mL에 생균수을 보여 유산균 생육시 감잎 추출물 첨가가 유산균 증식에 효과를 보였으며 pH는 3.74∼3.82, 산도는 1.528∼1.805로 낮게 나타내었다. 동결건조 보호제에서는 L. acidophilus MG501는 약30%정도 생존율의 감소를 보였으며 L. brevis MG19, L. bulgaricus MG515의 경우는 약 10% 정도 생존율 감소를 보였다. 반면에 L. lactis MG530는 약 10%정도 생존율 증가를 보였으며 L. casei MG311은 거의 동등한 효과를 나타냈다. Vitamin C 함량 변화는 L. lactis MG530에서 190.26mg/mL로 가장 높게 나타났으며 L. acidophilus MG501에서는 56.05mg/mL로 가장 낮게 나타났다. DPPH 라디칼 소거효과는 감잎 추출물 10% 첨가시에 높았으며 그 중에서도 L. brevis MG19에 감잎 추출물을 10% 첨가하여 배양한 경우 효과가 가장 높게 나타났다. SOD 유사활성은 전반적으로 대조군보다 비교적 낮은 활성을 나타냈다.

Probiotic and Antioxidant Properties of Novel Lactobacillus brevis KCCM 12203P Isolated from Kimchi and Evaluation of Immune-Stimulating Activities of Its Heat-Killed Cells in RAW 264.7 Cells

  • Song, Myung Wook;Jang, Hye Ji;Kim, Kee-Tae;Paik, Hyun-Dong
    • Journal of Microbiology and Biotechnology
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    • 제29권12호
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    • pp.1894-1903
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    • 2019
  • The purpose of this study was to determine the probiotic properties of Lactobacillus brevis KCCM 12203P isolated from the Korean traditional food kimchi and to evaluate the antioxidative activity and immune-stimulating potential of its heat-killed cells to improve their bio-functional activities. Lactobacillus rhamnosus GG, which is a representative commercial probiotic, was used as a comparative sample. Regarding probiotic properties, L. brevis KCCM 12203P was resistant to 0.3% pepsin with a pH of 2.5 for 3 h and 0.3% oxgall solution for 24 h, having approximately a 99% survival rate. It also showed strong adhesion activity (6.84%) onto HT-29 cells and did not produce β-glucuronidase but produced high quantities of leucine arylamidase, valine arylamidase, β-galactosidase, and N-acetyl-β-glucosaminidase. For antioxidant activity, it appeared that viable cells had higher radical scavenging activity in the 2,2-diphenyl-1-picryl-hydrazyl (DPPH) assay, while in the 2-azinobis-(3-ethylbenzothiazoline-6-sulfonic acid (ABTS) assay, heat-killed cells had higher antioxidant activity. Additionally, L. brevis KCCM 12203P showed higher lipid oxidation inhibition ability than L. rhamnosus GG; however, there was no significant difference (p < 0.05) between heat-killed cells and control cells. Furthermore, heat-killed L. brevis KCCM 12203P activated RAW 264.7 macrophage cells without cytotoxicity at a concentration lower than 108 CFU/ml and promoted higher gene expression levels of inducible nitric oxide synthase, interleukin-1β, and interleukin-6 than L. rhamnosus GG. These results suggest that novel L. brevis KCCM 12203P could be used as a probiotic or applied to functional food processing and pharmaceutical fields for immunocompromised people.

Identification of Bacteriocin-producing Lactic Acid Bacteria from Kimchi and Partial Characterization of their Bacteriocin

  • Ha, Duk-Mo;Cha, Dong-Soo
    • Journal of Microbiology and Biotechnology
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    • 제4권4호
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    • pp.305-315
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    • 1994
  • Nineteen strains of bacteriocin-producing lactic acid bacteria were isolated from 432 Kimchi samples, and identified by the comprehensive biochemical and morphological tests verifying their cellular fatty acid composition. Using partially purified bacteriocins from these isolates, their inhibitory activities against other lactic acid bacteria and some pathogens, and sensitivity to enzyme and heat treatments were tested. The isolates were identified as Lactobacillus plantarum (2 strains), L curvatus (2 starins), L brevis (2 strains), Enterococcus faecium (6 strains), Leuconostoc mesenteroides subsp. mesenteroides (1 strain) and Lactobacillus sp. (6 strains). The bacteriocins produced by E. faecium strains provided the broadest spectrum of inhibition, affecting against other Gram-positive bacteria including lactic acid bacteria and health-threatening bacteria such as Clostridium perfringens and Listeria monocytogenes. The bacteriocins of Lactobacillus sp., L plantarum and L brevis strains were capable of inhibiting many strains of the lactic acid bacteria, whereas those of L curvatus and L mesenteroides subsp. mesenteroides strains were only inhibitory to a few strains. Generally, the inhibitory activities of both E. faecium and Lactobacillus sp. strains were greater than those of other producer strains. The bacteriocins from the isolates were sensitive to several proteolytic enzymes, and those of L curvatus and L mesenteroides subsp. mesenteroides were also sensitive to lipase and $\alpha$-amylase as well as to proteolytic enzymes. The bacteriocins from the strains of Lactobacillus sp. and a strain of L. brevis were resistant to autoclaving.

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Lactobacillus brevis BK11의 증식과 항균물질 생산을 위한 최적 배양조건 및 prebiotics의 영향 (Optimal conditions and effects of prebiotics for growth and antimicrobial substances production of Lactobacillus brevis BK11)

  • 임은서
    • 미생물학회지
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    • 제51권3호
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    • pp.288-299
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    • 2015
  • 숙성된 백김치로부터 얻은 Lactobacillus brevis BK11의 증식과 항균물질 생산에 대한 배양용 배지 종류, 공기 조성, 초기 pH, 배양온도 및 시간과 프리바이오틱스의 영향을 조사하였다. L. brevis BK11의 증식과 항균물질 활성은 BHI와 M17 배지 보다는 MRS 배지 상에서 더 높게 나타났으며, 배지의 초기 pH 6.0에서 생산량이 최대에 이르렀다. 혐기적 조건보다는 호기적 및 미호기적 조건에서 배양했을 때와 $25^{\circ}C$ 보다는 $30^{\circ}C$$37^{\circ}C$ 온도에서 배양했을 때 균 성장과 항균물질 생산에 유리하였다. BK11 균주는 배양 24시간 만에 정지기에 도달하였고, 36시간 후부터는 생균수가 감소되었고, 배양상등액과 박테리오신 용액의 항균 활성은 $37^{\circ}C$, 24-30시간 배양했을 때 가장 높았다. 세포수와 유산 및 박테리오신 생산은 프락토올리고당 1-2% 첨가한 경우에 가장 높았으나, 이뉼린과 라피노오스는 균 증식에 별다른 도움을 주지 못했다. 결과적으로 L. brevis BK11의 항균물질 생산은 세포수와 관계 있었으며, 이러한 최적 조건 하에서 배양한 경우 Helicobacter pylori ATCC 43504의 성장을 효과적으로 저해할 수 있다.

(γ-Aminobutyric acid를 생산하는 Lactobacillus brevis AML15의 분리 및 특성 (Isolation and Characterization of Lactobacillus brevis AML15 Producing γ-Aminobutyric acid)

  • 신지원;김동걸;이용우;이형석;신기선;최충식;권기석
    • 생명과학회지
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    • 제17권7호통권87호
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    • pp.970-975
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    • 2007
  • 국내해안의 젓갈과 김치류로부터 86종의 GABA 생산균주를 분리하였다. 분리된 균주들을 Thin layer chromatography를 이용하여 GABA 생성능이 우수한 AML15, AML45-1, AML72의 3종의 균주를 선발하였다. 선별된 3종의 균주의 아미노산 분석 결과 GABA 생성능이 가장 우수한 AML15 균주를 본 실험에 사용하였다. AML15의 분류학적 위치를 규명하기 위하여 16S ribosomal DNA 영역의 부분염기서열 분석을 실시하였다. 165 rDNA 분석결과 Lactobacillus brevis ATCC 367과 99%의 유사도를 나타내어 L. brevis AML15로 명명하였다. MRS 배지에 최종 전환 농도로 설정된 5%(w/v) monosodium glutamic acid를 첨가하고 배지의 초기 pH를 4.0, 5.0과 6.0으로 조정하여 배양한 결과 배지의 초기 pH가 5.0일 때 GABA 생성능이 가장 높게 조사되었다. GABA 생산배지에 GAD 효소활성에 조효소로 작용하는 PLP를 0. 10. 50과 100 ${\mu}M$의 농도로 첨가하여 아미노산 분석결과 PLP를 10${\mu}M$ 첨가하였을 때 10,424 $nM/{\mu}$l의 GABA가생산되었다. PLP를 첨가하지 않았을 때보다 PLP 첨가 후 GABA 생성이 증가됨을 확인할 수 있었다.

Bioconversion of Flavones During Fermentation in Milk Containing Scutellaria baicalensis Extract by Lactobacillus brevis

  • Xu, Chen;Ji, Geun-Eog
    • Journal of Microbiology and Biotechnology
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    • 제23권10호
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    • pp.1422-1427
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    • 2013
  • Scutellaria baicalensis (SB), a traditional herb with high pharmacological value, contains more than 10% flavone by weight. To improve the biological activity of flavones in SB, we aimed to enhance the bioconversion of baicalin (BG) to baicalein (B) and wogonoside (WG) to wogonin (W) in SB during fermentation using beta-glucuronidase produced from Lactobacillus brevis RO1. After activation, L. brevis RO1 was cultured in milk containing SB root extract with various carbon or nitrogen sources at $37^{\circ}C$ for 72 h. During fermentation, the growth patterns of L. brevis RO1 and changes in the flavone content were assessed using thin-layer chromatography and high-performance liquid chromatography. After 72 h of fermentation, the concentrations of B and W in the control group increased by only 0.15 and 0.12 mM, respectively, whereas they increased by 0.57 and 0.24 mM in the fish peptone group. The production of B and W was enhanced by the addition of 0.4% fish peptone, which not only improved the growth of L. brevis RO1 (p < 0.001) but also enhanced the bioconversion of flavones. In conclusion, the bioconversion of flavones in SB may provide a potential application for the enhancement of the functional components in SB.