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排序方式: 共有221条查询结果,搜索用时 406 毫秒
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Lantibiotics are small (<5 kDa), polycyclic peptides produced by gram-positive bacteria; they are also known as gram-positive bacteriocins. The high antimicrobial activity of lacticins and the continuing appearance of antibiotic-resistant bacteria in recent years have resulted in a renewed interest in lantibiotics. A partially purified form of lacticin NK34 (a Lactococcus lactis product isolated from the Korean fermented fish jeotgal) was tested to determine its antimicrobial effects against Staphylococcus aureus (n = 20) and coagulase-negative Staphylococcus (CNS, n = 20) strains isolated from the raw milk of cows with subclinical bovine mastitis in the present study. The spot-on-lawn assay was used to identify the 2 strains from each group with the greatest lacticin NK34 susceptibility, and the minimal lethal dose (MLD) was measured in ICR (imprinting control region) mice. The preventive and therapeutic effects of lacticin NK34 on the mouse infection model were determined for the first time. Lacticin NK34 demonstrated antimicrobial effects in 14 of 20 (70%) S. aureus indicator strains and in 18 of 20 (90%) CNS strains. Staphylococcus aureus 69 and S. simulans 55 demonstrated the greatest susceptibility to lacticin NK34 in the spot-on-lawn assay. The S. aureus 69 MLD was measured at 1.53 × 109 cfu/mouse, whereas the S. simulans 55 MLD was 3.59 × 109 cfu/mouse. Mice infected experimentally with S. aureus 69 MLD or S. simulans 55 MLD were treated with lacticin NK34. Treated mice demonstrated an 80% survival rate (48 of 60 mice) compared with a survival rate of 7.5% (3 of 40 mice) in control mice treated with distilled water. These data suggest that lacticin NK34 might be useful in the control of bovine mastitis and systemic bacterial infection. 相似文献
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Yenizey M Alvarez‐Cisneros Francisco J Fernández Carmen Wacher‐Rodarte Manuel B Aguilar Teresita del Rosario Sáinz Espuñes Edith Ponce‐Alquicira 《Journal of the science of food and agriculture》2010,90(14):2475-2481
BACKGROUND: Enterococci are lactic acid bacteria that can produce bacteriocins, which may offer an additional hurdle to control the growth of food‐borne pathogens; moreover, these bacteriocins may have great potential as natural biopreservatives. The aim of this work was to characterize a bacteriocin‐like inhibitory substance (BLIS) with antilisterial activity produced by an enterococcal strain. RESULTS: The bacteriogenic strain was isolated from Mexican fermented sausages and identified as Enterococcus faecium with 99% sequence similarity. Maximal activity was detected at 16 h, where bacterial growth was in middle of the stationary phase. The producer strain was not inhibited by its own antimicrobial peptide. BLIS showed a strong anti‐Listeria activity and was inactivated by proteinase K. Heating (121 °C for 15 min) induced some inactivation, but thermotolerance was higher at acid pH values. The yield obtained with a pH‐mediated purification process was 32.7%, showing a band with an estimated molecular weight of 3.5 kDa. Automated N‐terminal Edman degradation showed the following sequence: YYGNGVTCGSHHCSVD. CONCLUSION: Biochemical characteristics of BLIS produced by E. faecium MXVK29 suggested that it belongs to Class IIa of the Klaenhammer classification and could be considered as a natural food preservative, although further studies need to be performed. Copyright © 2010 Society of Chemical Industry 相似文献
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Yanhua Cui Chao Zhang Yunfeng Wang John Shi Lanwei Zhang Zhongqing Ding Xiaojun Qu Hongyu Cui 《International journal of molecular sciences》2012,13(12):16668-16707
Class IIa bacteriocins are heat-stable, unmodified peptides with a conserved amino acids sequence YGNGV on their N-terminal domains, and have received much attention due to their generally recognized as safe (GRAS) status, their high biological activity, and their excellent heat stability. They are promising and attractive agents that could function as biopreservatives in the food industry. This review summarizes the new developments in the area of class IIa bacteriocins and aims to provide uptodate information that can be used in designing future research. 相似文献
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María José Grande Burgos Rubén Pérez Pulido María del Carmen López Aguayo Antonio Gálvez Rosario Lucas 《International journal of molecular sciences》2014,15(12):22706-22727
Enterocin AS-48 is a circular bacteriocin produced by Enterococcus. It contains a 70 amino acid-residue chain circularized by a head-to-tail peptide bond. The conformation of enterocin AS-48 is arranged into five alpha-helices with a compact globular structure. Enterocin AS-48 has a wide inhibitory spectrum on Gram-positive bacteria. Sensitivity of Gram-negative bacteria increases in combination with outer-membrane permeabilizing treatments. Eukaryotic cells are bacteriocin-resistant. This cationic peptide inserts into bacterial membranes and causes membrane permeabilization, leading ultimately to cell death. Microarray analysis revealed sets of up-regulated and down-regulated genes in Bacillus cereus cells treated with sublethal bacteriocin concentration. Enterocin AS-48 can be purified in two steps or prepared as lyophilized powder from cultures in whey-based substrates. The potential applications of enterocin AS-48 as a food biopreservative have been corroborated against foodborne pathogens and/or toxigenic bacteria (Listeria monocytogenes, Bacillus cereus, Staphylococcus aureus, Escherichia coli, Salmonella enterica) and spoilage bacteria (Alicyclobacillus acidoterrestris, Bacillus spp., Paenibacillus spp., Geobacillus stearothermophilus, Brochothrix thermosphacta, Staphylococcus carnosus, Lactobacillus sakei and other spoilage lactic acid bacteria). The efficacy of enterocin AS-48 in food systems increases greatly in combination with chemical preservatives, essential oils, phenolic compounds, and physico-chemical treatments such as sublethal heat, high-intensity pulsed-electric fields or high hydrostatic pressure. 相似文献
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乳酸乳球菌L9产类细菌素lactococcin GJ-9发酵条件的研究 总被引:2,自引:1,他引:2
对产类细菌素乳酸乳球菌L9的发酵条件进行了研究。结果表明 :产类细菌素最适培养基为MRS,培养基的最适初始pH值为 6 5 ;产类细菌素最适温度为 32℃ ;0 2 %Tween 80最适类细菌素的产生。并通过正交试验确定L9产类细菌素的最佳培养基为 :大豆蛋白胨 1 %、酵母膏1 5%、葡萄糖 1 2 5 %、K2 HPO40 2 %、NaAc 0 5 %、MgSO4·7H2 O 0 0 58%、柠檬酸三铵 0 2 %、MnSO4·4H2 O 0 0 0 5 %、Tween 80 0 2 % ;初始 pH6 0。经过优化 ,发酵液效价提高了 61 0 7%。 相似文献