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一株后生元菌株的抑菌特性研究及其细菌素基因簇的挖掘

张晓妍 沙沈菲 郭丽丹 贾爽 周婉婷 陈雨滢 汪立平

张晓妍,沙沈菲,郭丽丹,等. 一株后生元菌株的抑菌特性研究及其细菌素基因簇的挖掘[J]. 食品工业科技,2022,43(17):1−10. doi: 10.13386/j.issn1002-0306.2022030280
引用本文: 张晓妍,沙沈菲,郭丽丹,等. 一株后生元菌株的抑菌特性研究及其细菌素基因簇的挖掘[J]. 食品工业科技,2022,43(17):1−10. doi: 10.13386/j.issn1002-0306.2022030280
ZHANG Xiaoyan, SHA Shenfei, GUO Lidan, et al. Antimicrobial Properties of A Postbiotic Strain and Gene Cluster Mining of Its Bacteriocin[J]. Science and Technology of Food Industry, 2022, 43(17): 1−10. (in Chinese with English abstract). doi: 10.13386/j.issn1002-0306.2022030280
Citation: ZHANG Xiaoyan, SHA Shenfei, GUO Lidan, et al. Antimicrobial Properties of A Postbiotic Strain and Gene Cluster Mining of Its Bacteriocin[J]. Science and Technology of Food Industry, 2022, 43(17): 1−10. (in Chinese with English abstract). doi: 10.13386/j.issn1002-0306.2022030280

一株后生元菌株的抑菌特性研究及其细菌素基因簇的挖掘

doi: 10.13386/j.issn1002-0306.2022030280
基金项目: 2019年教育部高等教育司第二批产学合作协同育人项目资助(201902187007);大学生创新创业训练计划项目(X202110264048)。
详细信息
    作者简介:

    张晓妍(1996−),女,硕士研究生,研究方向:益生菌及其代谢产物,E-mail:seranne_run@163.com

    通讯作者:

    汪立平(1968−),女,博士,副教授,研究方向:益生元、益生菌及其代谢产物、传统发酵食品,E-mail:lpwang@shou.edu.cn

  • 中图分类号: TS201.3

Antimicrobial Properties of A Postbiotic Strain and Gene Cluster Mining of Its Bacteriocin

  • 摘要: 本文旨在筛选一株可拮抗中国大鲵源嗜水气单胞菌的后生元菌株,并对其进行抑菌特性的研究和细菌素基因簇的挖掘。以中国大鲵病原性嗜水气单胞菌(Aeromonas hydrophila, Ah2)为指示菌,筛选一株产细菌素乳酸菌株并评估其药敏特性;采用有机溶剂萃取法初步纯化菌株产细菌素;通过pH、温度和消化酶耐受性、贮藏稳定性、抑菌谱及最小抑菌(MIC)和杀菌浓度(MBC)共六类指标评价细菌素的抑菌特性;溶血反应与细胞毒性实验测试细菌素对Ah2的抑菌效果,经扫描电子显微镜初步探究细菌素的抑菌机制;经由紫外全波长扫描定性细菌素以及Tricine-SDS-PAGE电泳测定细菌素的分子量范围;最后根据菌株的全基因组序列挖掘其潜在的细菌素基因簇(RiPPs)。结果显示,从青岛市售腐乳中筛出一株产细菌素植物乳植物杆菌M4L1(Lactiplantibacillus plantarum M4L1)。初步纯化M4L1产细菌素并命名为LP01。细菌素LP01具备良好的消化酶耐受性,且在pH2~10、−20~121 ℃和9个月贮藏期内均表现出稳定的抑菌活性,并对单增李斯特菌、弗氏柠檬酸杆菌等14株革兰氏阳性和阴性菌均有不同程度的抑制作用;另外,LP01对Ah2的MIC和MBC分别为12.94和25.88 μg/mL。经MBC浓度的LP01处理后的Ah2,溶血活性和细胞毒性均得到明显缓解;SEM观察其通过破坏Ah2的细胞壁具有抑制或杀伤作用。LP01在波长200~220 nm处的肽类特征吸收峰显著,电泳后条带显示其分子量在3.3~4.0 kDa,LP01为小分子肽类细菌素。此外,基因注释到M4L1有2个细菌素基因簇(RiPPs),对应产物分别为Plantaricin K和Plantaricin E,均属于植物乳杆菌II类细菌素。菌株M4L1不仅含有多种抗菌物质相关基因簇,而且其细菌素LP01具备了优良的抑菌性能,能有效抑制多种水产病原菌、食物腐败菌及食源性致病菌等。产细菌素植物乳植物杆菌M4L1作为一株潜在的后生元菌株具有较好的应用前景。

     

  • 图  四株乳酸菌对Ah2的抑菌效果对比

    注:QD5、SH7、M4D2和M4L1为对Ah2有较好抑菌效果的4株乳酸菌。

    Figure  1.  Comparison of inhibition effect on four strains of lactic acid bacteria against Ah2

    图  菌株M4L1的菌落形态和显微形态图

    Figure  2.  Colony and microscopic morphology of M4L1

    图  植物乳植物杆菌M4L1的生长动态及抑菌活性规律

    Figure  3.  Growth dynamics and antimicrobial regularity of L. plantarum M4L1

    图  细菌素LP01的耐受性

    注:A:pH耐受性;B:温度耐受性;C:贮藏稳定性;D:酶敏感性;不同小写字母说明具有显著差异(P<0.05)。

    Figure  4.  Tolerance of bacteriocin LP01

    图  细菌素LP01对Ah2引起的溶血活性和细胞毒性的影响

    注:A:溶血反应检测;B:细胞毒性试验;MIC和MBC:LP01处理组;NC:阴性无Ah2对照组;PC:阳性有Ah2对照组。

    Figure  5.  Effect of bacteriocin LP01 on hemolysis and cytotoxicity caused by Ah2

    图  指示菌Ah2的SEM图

    注:A:未经处理的Ah2;B:经MIC处理1 h;C:经MBC处理1 h;1:单个细胞;2:群体细胞。

    Figure  6.  SEM images of indicator Ah2

    图  细菌素LP01的紫外全波长扫描图

    注:肽类波长:200~220 nm;蛋白类波长:280 nm。

    Figure  7.  UV full-wavelength scanning of bacteriocin LP01

    图  细菌素LP01的Tricine-SDS-PAGE电泳图

    注:Marker:超低分子量蛋白质标准;1:经过染色的样品谱带;2:凝胶原位检测样品条带。

    Figure  8.  Tricine-SDS-PAGE of bacteriocin LP01

    图  植物乳植物杆菌M4L1的细菌素基因簇图谱

    Figure  9.  Genetic organization map of bacteriocin gene clusters of L. plantarum M4L1

    表  1  四株乳酸菌的抑菌活性

    Table  1.   Antimicrobial activity of four strains of lactic acid bacteria

    菌株编号抑菌圈直径(mm)
    QD519.21±0.13c
    SH716.85±0.14d
    M4D223.45±0.32b
    M4L125.13±0.27a
    注:不同小写字母说明具有显著差异(P<0.05)。
    下载: 导出CSV

    表  2  植物乳植物杆菌M4L1的药敏特性

    Table  2.   Antibiotic susceptbility of L. plantarum M4L1

    抗生素抑菌圈直径判断标准(mm)药物含量
    (μg/片)
    抑菌圈直径
    (mm)
    敏感性
    耐药(R)中度敏感(I)高度敏感(S)
    复方新诺明Cotrimoxazole≤1011~15≥1623.7518.61±0.25S
    头孢曲松
    Ceftriaxone
    ≤1314~20≥213031.42±0.16S
    环丙沙星
    Ciprofloxacin
    ≤1516~20≥2150R
    氨苄西林
    Ampicillin
    ≤1516~22≥231023.96±0.32S
    庆大霉素
    Gentamicin
    ≤1213~14≥16100R
    林可霉素
    Lincomycin
    ≤1415~20≥21213.63±0.22R
    氯霉素
    Chloroamphenicol
    ≤1213~17≥183021.34±0.11S
    四环素
    Tetracycline
    ≤1415~18≥193020.25±0.19S
    红霉素
    Erythromycin
    ≤1314~22≥231520.92±0.38I
    青霉素
    Penicillin
    ≤1920~22≥2310016.98±0.30R
    下载: 导出CSV

    表  3  细菌素LP01的抑菌谱

    Table  3.   Antibacterial spectrum of bacteriocin LP01

    类别菌株抑菌圈直径(mm)类别菌株抑菌圈直径(mm)
    G+蜡样芽孢杆菌
    Bacillus cereus
    21.50±0.48G-副溶血性弧菌
    Vibrio parahaemolyticus®
    30.67±0.29
    腐生葡萄球菌
    Staphylococcus saprophysis
    16.13±0.42腐败希瓦氏菌
    Shewanella putrefaciens®
    20.37±0.32
    金黄色葡萄球菌
    Staphylococcus aureus®
    21.05±0.32嗜水气单胞菌(鲫源)
    Aeromonas hydrophila
    32.83±0.29
    单增李斯特氏菌
    Listeria monocytogenes®
    36.67±0.29弗氏柠檬酸杆菌
    Citrobacter freundii
    26.13±0.40
    变形链球菌
    Streptococcus mutans
    28.90±0.36医院不动杆菌
    Acinetobacter nosocomialis
    28.90±0.36
    大肠杆菌
    Escherichia coli®
    26.43±0.40鲍曼不动杆菌
    Acinetobacter baumannii
    32.53±0.22
    真菌酿酒酵母
    Saccharomyceb cerevisiae
    0沙门氏菌
    salmonella enterica®
    31.77±0.25
    德巴利汉逊酵母
    Debaryomyceb hansenii
    9.16±0.35摩根氏菌
    Morganella morganii
    26.3±0.35
    注:G+和G-表示革兰氏阳性和阴性菌;符号‘®’表示ATCC菌株,未标记的菌为实验室分离;抑菌圈直径数值包含孔的直径(6.02±0.18)mm。
    下载: 导出CSV
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