CN113862161A - 一种红千层内生真菌及其应用 - Google Patents
一种红千层内生真菌及其应用 Download PDFInfo
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- CN113862161A CN113862161A CN202111239691.7A CN202111239691A CN113862161A CN 113862161 A CN113862161 A CN 113862161A CN 202111239691 A CN202111239691 A CN 202111239691A CN 113862161 A CN113862161 A CN 113862161A
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Abstract
本发明属于微生物技术领域,特别涉及一种红千层内生真菌及其应用,所述红千层内生真菌分类命名为:Neofusicoccum sp.J019,保藏于广东省微生物菌种保藏中心(GDMCC),其保藏编号为:GDMCC 61810,保藏日期为:2021年7月16日。本发明获得的红千层内生真菌Neofusicoccum sp.J019在PD液体培养基中获得的发酵产物对大肠埃希菌和金黄色葡萄球菌有较强抑制作用,对肠沙门氏菌有很强抑制作用。本发明为生产抗菌药物提供新的资源和途径。
Description
技术领域
本发明属于微生物技术领域,特别涉及一种红千层内生真菌及其应用。
背景技术
近年来,细菌耐药性持续增强,国际临床抗生素用药仍不乏一些老产品,如头孢菌素类、喹诺酮类、大环内酯类以及青霉素类药物等。早在1958年,美国开发出糖肽类抗生素万古霉素,在多个国家广泛应用于临床,十年后华北制药厂成功研制去甲万古霉素,在临床上对耐甲氧西林金黄色葡萄球菌导致的肺部感染有良好疗效,被作为万古霉素仿制药使用。但由于抗生素的滥用,抗菌药物的持续研发仍迫在眉睫,并且需要深入探索环境友好型、可人工再生的优质药源。
近年来,针对桃金娘科植物代谢物抗虫和抗菌作用的研究是天然药物化学的热点方向,该科植物富含柠檬烯、α–蒎烯等活性成分。桃金娘科约有100属,3000余种,其中包括有白千层属、红千层属等。白千层属(Melaleuca)为较好的庭园观赏树,主要分布在大洋洲。白千层属的植物精油对大肠杆菌、粪产碱杆菌、白色念珠菌等多种细菌具有抗菌活性,其中香茅醛和香茅醇共同作用使得柠檬桉精油具有抗菌活性。红千层属(Callistemon)也是广泛用于绿化、园艺观赏、入药和制取精油等。此外,垂枝红千层(C.viminalis)来源精油对人体致病菌枯草芽孢杆菌有显著的抑制作用。桃金娘科植物的化学成分非常丰富,不断有新颖活性天然产物被发掘,一直以来受到天然产物学家的热切关注。
植物内生菌是具有成药潜力的天然产物的重要来源,与其宿主植物之间的具有共生关系。已有研究显示,植物内生菌的代谢产物不仅可以表现出与宿主植物化学成分活性的差异,还存在产生与宿主植物相同或相似的药用活性成分的情况,比如紫杉醇及其类似物,喜树碱和10–羟基喜树碱,石杉碱甲,金丝桃素等。这提示我们桃金娘科植物内生菌中可能存在某些内生真菌,能够产生具有抗菌活性的代谢产物,这将为抗菌药物的开发提供重要资源,有望发现新的活性药物分子和先导化合物。
目前仅有少量文献报道对桃金娘科红千层属植物红千层(C.rigidus R.Br.)的研究,对红千层内生菌的研究更加匮乏。
发明内容
为了克服上述现有技术中的问题,提供一种红千层内生真菌及其应用。
为实现上述目的,本发明所采用的技术方案是:
一种红千层内生真菌,所述红千层内生真菌分类命名为:Neofusicoccumsp.J019,保藏于广东省微生物菌种保藏中心(GDMCC),其保藏编号为:GDMCC 61810,保藏日期为:2021年7月16日,保藏地址为:广州市先烈中路100号大院59号楼。
所述红千层内生真菌Neofusicoccum sp.J019,提取其基因组DNA,利用ITS通用引物ITS1和ITS4进行扩增分析,得到单一DNA条带,提交GenBank数据库中进行Blast比对,筛选相似度最高的序列,建立系统进化树,最终鉴定为新壳梭孢Neofusicoccum sp.。该菌株在PD液体培养基中获得的发酵产物对大肠埃希菌和金黄色葡萄球菌有较强抑制作用,对肠沙门氏菌有很强抑制作用。
所述红千层内生真菌的代谢产物的制备方法,包括以下步骤:
S1.取-80℃,20%甘油保藏的菌种,解冻后吸出甘油水溶液,挑取菌种到PDA平板上,25~30℃恒温活化3~7天;
S2.将步骤S1活化后的菌种在PDA平板上划线接种,置于25~30℃培养箱生长3~7天后用于大量发酵的接种,每块长满菌体的平板以无菌水刮洗菌体,接种到PD液体培养基中,于28℃恒温振荡培养摇床中以120~150rpm的转数培养7天得到发酵液;
S3.将步骤S2获得的发酵液进行过滤,滤液用等量乙酸乙酯萃取2~5次,合并乙酸乙酯层并减压浓缩,得到菌株发酵代谢产物。
所述红千层内生真菌的代谢产物的制备方法所获得的红千层内生真菌的代谢产物。
所述红千层内生真菌的代谢产物在制备抗菌药物中的应用。
优选地,所述代谢产物在制备抗肠沙门氏菌、大肠埃希菌和金黄色葡萄球菌药物中的应用。
与现有技术相比,本发明具有以下技术效果:
本发明公开的一种红千层内生真菌的代谢产物的制备方法,获得的红千层内生真菌Neofusicoccum sp.J019在PD液体培养基中获得的发酵产物对大肠埃希菌和金黄色葡萄球菌有较强抑制作用,对肠沙门氏菌有很强抑制作用。本发明为生产抗菌药物提供新的资源和途径。
附图说明
图1五株红千层内生真菌菌落形态,a菌株J014;b菌株J015;c菌株J016;d菌株J019;e菌株J020;
图2五株红千层内生真菌的系统进化树,1菌株J014;2菌株J015;3菌株J016;4菌株J019;5菌株J020;
图3菌株J019次级代谢产物的HPLC峰形图,a 208nm;b 254nm。
具体实施方式
下面对本发明的具体实施方式作进一步说明。在此需要说明的是,对于这些实施方式的说明用于帮助理解本发明,但并不构成对本发明的限定。此外,下面所描述的本发明各个实施方式中所涉及的技术特征只要彼此之间未构成冲突就可以相互组合。
本发明中涉及到的主要原辅料:
受试菌株:抑菌实验所用菌株为大肠埃希氏菌(Escherichia coli)ATCC25922、金黄色葡萄球菌金黄亚种(Staphylococcus aureus subsp.aureus)ATCC29213、肠沙门氏菌肠亚种(Salmonella enterica subsp.enterica)ATCC14028、铜绿假单胞菌(Pseudomonasaeruginosa)ATCC27853,以上菌株均购自中国普通微生物菌种保藏管理中心(ChinaGeneral Microbiological Culture Collection Center,CGMCC)。
头孢他啶购自上海源叶生物科技有限公司;青霉素G钠购自Biosharp公司,DMSO购自Sigma公司。
下述实验例中所使用的试验方法如无特殊说明,均为常规方法;所使用的材料、试剂等,如无特殊说明,为可从商业途径得到的试剂和材料。
实施例1红千层内生真菌的分离
PDA单抗培养基(每升):去皮鲜马铃薯200g,切碎,煮沸30min,以8层纱布过滤,加入葡萄糖20g,KH2PO4 3g,MgSO4·7H2O 1.5g,维生素B1 10mg,琼脂20g,加蒸馏水定容至1L,自然pH,121℃灭菌30min。灭菌后加入40μg/mL硫酸卡那霉素。
分离材料:红千层(Callistemon rigidus R.Br.)采自广州市南沙湿地公园,样品采集后在24h内进行处理,用无菌水冲洗采集的新鲜样品的叶片和茎,在经过紫外线照射30min的无菌工作台上,用5%次氯酸钠溶液浸泡1分钟,无菌水冲洗三次;再用75%乙醇浸泡1分钟,无菌水冲洗三次,用无菌滤纸吸干水分。用最后一次漂洗用的无菌水涂板作为阴性对照。茎用无菌手术剪去两端,取中间部位剪成1cm长的小段;叶片用无菌剪刀剪去边缘后剪成约0.5cm×0.5cm的方块;处理好的样品放入事先准备好的PDA单抗平板培养基中,每个培养皿接种3块相同类型组织块,每个样本每种组织部位平行接种三块平板,28℃恒温培养,每天观察,视菌体生长情况培养3~7天,待培养基上可观察到从组织块内部向周围长出菌丝时,挑取形态不同的菌落转移到新培养基上继续培养,重复此过程,直至菌株菌体生长状态单一,即得到纯化的菌株。共分离获得5株纯化的内生真菌(分别为J014、J015、J016、J019、J020,为发明人的自命名),5株内生真菌菌落形态如图1所示。纯化后的菌株在20%的灭菌甘油管内-80℃保存。
实施例2 5株红千层内生菌的鉴定
使用真菌基因组DNA小量提取试剂盒(Mabio)提取菌株的DNA,作为PCR扩增的模板。PCR扩增采用真菌rDNA内转录间隔区(rDNA ITS)通用引物ITS1(5'-TCCGTAGGTGAACCTGCGG-3',正向)和ITS4(5'-TCCTCCGCTTATTGATATGC-3',反向)扩增分离菌株的rDNA ITS区。获得的序列通过BLAST程序在GenBank上进行相似性序列检索分析,对分离菌株进行鉴定。选择与目标菌株同源性较高的菌株序列,用软件MEGA7.0.14进行系统发育分析,构建系统发育进化树,5株红千层内生真菌的系统进化树如图2所示。菌株J014(SEQ ID NO.1)与胶孢炭疽菌Colletotrichum gloeosporioides(KC215125.1)相似度为99.27%,菌株J015(SEQ ID NO.2)与菌核青霉Penicillium sclerotiorum(MF135518.1)相似度为99.45%,菌株J016(SEQ ID NO.3)与拟茎点霉Phomopsis sp.(MH712182.1)相似度为99.26%,菌株J019(SEQ ID NO.4)与新壳梭孢Neofusicoccum parvum(MH393201.1)相似度为99.82%,菌株J020(SEQ ID NO.5)与Quambalaria simpsonii(MT879594.1)相似度为99.53%。
结合菌落形态观察,五株内生菌最终鉴定结果为:菌株J014是炭疽菌Colletotrichum sp.,菌株J015是青霉菌Penicillium sp.,菌株J016是拟茎点霉Phomopsis sp.,菌株J019是新壳梭孢Neofusicoccum sp.,菌株J020是Quambalaria sp.。
实施例3内生菌发酵产物的制备
PD液体培养基(每升):去皮鲜马铃薯200g,切碎,煮沸30min,以8层纱布过滤,加入葡萄糖20g,KH2PO4 3g,MgSO4·7H2O 1.5g,维生素B1 10mg,加蒸馏水定容至1L,自然pH,121℃灭菌30min。
将20%灭菌甘油-80℃保存的菌种,解冻后吸出甘油水溶液,挑取菌种到PDA平板上,28℃恒温活化3~7天;活化后的菌种在PDA平板上划线接种,置于28℃培养箱生长3~7天后用于大量发酵的接种,每块长满菌体的平板(90mm i.d.)以无菌水刮洗菌体,接种到PD液体培养基中(250ml规格三角瓶×2,合计培养液约300mL),于28℃恒温振荡培养摇床中以140rpm的转数培养7天得到发酵液;将获得的发酵液进行过滤,滤液用等量乙酸乙酯萃取3次,合并乙酸乙酯层并减压浓缩,得到菌株发酵代谢产物,结果如表1所示。
表1五株红千层内生真菌发酵代谢产物的质量
实施例4内生真菌的抗菌活性研究
表2样品信息
将待测样品加入96孔培养板,工作终浓度为128μg/mL;向各孔加入菌液,分别是大肠埃希氏菌(Escherichia coli)ATCC25922、金黄色葡萄球菌金黄亚种(Staphylococcusaureus subsp.aureus)ATCC29213、肠沙门氏菌肠亚种(Salmonella entericasubsp.enterica)ATCC14028、铜绿假单胞菌(Pseudomonas aeruginosa)ATCC27853,菌液工作终浓度均为5×105CFU/mL;37℃培养24h,酶标仪测定625nm下的OD值。实验同时设置培养基空白对照、细菌对照以及头孢他啶、青霉素G钠阳性药对照。
表3五株红千层内生真菌代谢产物对四株细菌的抑制作用
本实验对5个菌株代谢产物进行大肠埃希菌、金黄色葡萄球菌、肠沙门氏菌和铜绿假单胞菌的抗细菌活性筛选。结果显示,浓度为128μg/mL时,菌株J019对大肠埃希菌和金黄色葡萄球菌有较强抑制作用(抑制率大于50%,表3),对肠沙门氏菌有很强抑制作用(抑制率大于90%,表3)。
实施例5菌株J019的化学成分研究
通过HPLC法分析菌株J019的次级代谢产物:色谱柱为C18柱(250mm×4.6mm,5μm),流动相为甲醇–水。5%-100%甲醇洗脱,体积流量1.0mL/min,DAD检测,柱温35℃,进样量10μl。
代谢产物在208nm、254nm波长下吸收较明显,HPLC峰形图(图3)。从HPLC峰形图上可以看出,菌株J019的次级代谢产物丰富,且主要成分集中在35%–50%甲醇极性段。收集每一种峰形代表的化合物,进行抗菌实验以确定具有抗菌活性的单体化合物。
以上对本发明的实施方式作了详细说明,但本发明不限于所描述的实施方式。对于本领域的技术人员而言,在不脱离本发明原理和精神的情况下,对这些实施方式进行多种变化、修改、替换和变型,仍落入本发明的保护范围内。
序列表
<110> 中山大学·深圳
中山大学
<120> 一种红千层内生真菌及其应用
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tcgcatttcg ctgcgttctt catcgatgcc agaaccaaga gatccgttgt tgaaagtttt 360
agtttattaa cttgtttttc agactgcgaa gttcactgac tggagtttta tggtcctctg 420
gcgggcgctg gccagccccc cgaagggcgc cggtgcggag gaccgcggcc cgccaaagca 480
acagaggtag gtacacattg ggtgggagag tcgagccgga gctcgaatca actcggtaat 540
gatccttccg c 551
<210> 5
<211> 651
<212> DNA
<213> 人工合成(人工合成)
<400> 5
ttaagggatt ttaggggctc cactctgtgg atcccgaccc tcacattatc cacatacact 60
tgtgcactgt tggtcaggtg tgagctcgag cccttaaccg ggcgacggct tgtttatcac 120
ctgccaacgc caattataca aactctgaga actatgaatg tgaatttaac ttgccaattt 180
ttggcgaaat taaatacaac tttcgacaac ggatctcttg gttctcccat cgatgaagaa 240
cgcagcgaat tgcgataagt aatgtgaatt gcagaattca gtgaatcatc gaatctttga 300
acgcaccttg cgctccctgg tattcctagg agcatgcctg tttgagtgtc atgaattcct 360
caaaccccaa tgttttgcaa aattcattgc ttgggtttgg ttgtgggcct atattgctgc 420
ttcacggcag ctggccttaa agatattagc tggactctcc gagactcttg gatagttcca 480
cttgatgtga taaatttgca tcggtgggtc aagactatgc ttgggaagtg tgagaagtct 540
gcttctaatc cggcgagagg tcccatcctc gacccaattc atttacaact ctggcctcaa 600
atcaggtagg actacccgct gaacttaagc atatcaaaaa ccggagggaa a 651
Claims (5)
1.一种红千层内生真菌,其特征在于,所述红千层内生真菌分类命名为:Neofusicoccum sp.J019,保藏于广东省微生物菌种保藏中心(GDMCC),其保藏编号为:GDMCC 61810,保藏日期为:2021年7月16日。
2.权利要求1所述红千层内生真菌的代谢产物的制备方法,其特征在于,包括以下步骤:
S1.取-80℃,20%甘油保藏的菌种,解冻后吸出甘油水溶液,挑取菌种到PDA平板上,25~30℃恒温活化3~7天;
S2.将步骤S1活化后的菌种在PDA平板上划线接种,置于25~30℃培养箱生长3~7天后用于大量发酵的接种,每块长满菌体的平板以无菌水刮洗菌体,接种到PD液体培养基中,于28℃恒温振荡培养摇床中以120~150rpm的转数培养7天得到发酵液;
S3.将步骤S2获得的发酵液进行过滤,滤液用等量乙酸乙酯萃取2~5次,合并乙酸乙酯层并减压浓缩,得到菌株发酵代谢产物。
3.根据权利要求2所述红千层内生真菌的代谢产物的制备方法所获得的红千层内生真菌的代谢产物。
4.根据权利要求3所述红千层内生真菌的代谢产物在制备抗菌药物中的应用。
5.根据权利要求4所述应用,其特征在于,所述代谢产物在制备抗肠沙门氏菌、大肠埃希菌和金黄色葡萄球菌药物中的应用。
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CN106520572A (zh) * | 2016-11-16 | 2017-03-22 | 河南省农业科学院 | 一种香椿内生真菌56‑50及其次级代谢产物、制备方法和应用 |
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Non-Patent Citations (2)
Title |
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CADELIS M.M.等: "Antimicrobial metabolites against methicillin-resistant Staphylococcus aureus from the endophytic fungus Neofusicoccum australe", MOLECULES, vol. 26, pages 1 - 10 * |
LORENZINI M.等: "Isolation of Neofusicoccum parvum from withered grapes: strain characterization, pathogenicity and its detrimental effects on passito wine aroma", JOURNAL OF APPLIED MICROBIOLOGY, vol. 119, pages 1335 - 1344 * |
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