CN105777875B - 一种抗菌肽cstc24及其应用 - Google Patents

一种抗菌肽cstc24及其应用 Download PDF

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CN105777875B
CN105777875B CN201610357119.3A CN201610357119A CN105777875B CN 105777875 B CN105777875 B CN 105777875B CN 201610357119 A CN201610357119 A CN 201610357119A CN 105777875 B CN105777875 B CN 105777875B
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CN105777875A (zh
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张敏
贺淑文
郝磊娜
程顺峰
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Qingdao Agricultural University
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Abstract

本发明涉及一种抗菌肽CSTC24及其应用,具体涉及一种抗菌肽,其特征在于:所述抗菌肽的序列如SEQ ID No.1所示。该抗菌肽可有效杀伤创伤弧菌、藤黄微球菌和金黄色葡萄球菌三种鱼类致病菌,以及传染性脾肾坏死病毒。本发明的抗菌肽经实验验证效果优异。

Description

一种抗菌肽CSTC24及其应用
技术领域
本发明涉及分子微生物学领域,具体的说是一种抗菌肽及其应用。
背景技术
近年来,随着水产养殖规模的不断扩大和养殖环境的不断恶化,各种病害也随之频繁发生。目前水产养殖病害控制仍以传统的抗生素药物为主。长期使用抗生素不仅使细菌等病原产生耐药性,还造成药物在动物体内超量残留和养殖环境的严重污染,已严重影响到我国食品安全与养殖业的健康发展。因此,寻找能够替代传统抗生素药物的抗菌物质,实现环境无污染、水产品无药物残留的目标,已成为目前养殖业健康发展的迫切需求。抗菌肽几乎是所有生命物种都有的重要免疫分子,具有广谱抗菌活性和抗病毒、抗真菌、抗寄生虫及抗肿瘤等生物活性,并且抗菌肽具有不易产生耐药性、热稳定性强等传统抗生素药物不可替代优势,因而越来越受到人们的关注。最近研究发现,人类组织因子途径抑制物(tissue factor pathway inhibitor,TFPI)的C末端衍生肽具有广谱抗菌和抗病毒作用,鱼类TFPI的研究仅限于美国红鱼,研究发现其重组蛋白和TFPI-1的C末端衍生肽对迟缓爱德华氏菌具较强的杀菌作用。
发明内容
为了克服上述缺陷,本发明一方面提供了一种抗菌肽,其特征在于:所述抗菌肽的序列如SEQ ID No.1所示。
进一步地,本发明的另一个方面提供了如上所述的抗菌肽在制备抑制细菌的药物中的应用。
进一步地,所述细菌为鱼类致病菌,优选为创伤弧菌、藤黄微球菌和金黄色葡萄球菌。
进一步地,本发明的另一个方面提供了如上所述的抗菌肽在制备抗病毒的药物中的应用。
进一步地,所述病毒选自传染性脾肾坏死病毒。
有益效果
本发明的抗菌肽具有高效抑菌作用,可以有效抑制多种致病菌和病毒,因此可以应用于鱼类病害防治。
具体实施方式
下面结合实施例对本发明作进一步说明。实施例旨在对本发明进行举例描述,而非以任何形式对本发明进行限制。
实施例1
本发明的抗菌肽CSTC24具序列表SEQ ID No.1中的氨基酸序列。
序列SEQ ID No.1为:RRHCIKKCMKSRKHNERMIRIRRK
序列
(a)序列特征:
长度:24
类型:氨基酸序列
链型:单链
拓扑结构:线性
(b)分子类型:蛋白质
(c)假设:否
(d)反义:否
(e)最初来源:人工合成
本实施例合成的抗菌肽CSTC24按照Fmoc固相多肽合成法,最终得到纯度大于90%的抗菌肽CSTC24。合成时将一个Fmoc-氨基酸衍生物共价交联到树脂上,经过树脂溶胀,脱保护,称料,投料,反应后洗涤,检测,合成完毕后的洗涤和干燥后再连接下一个氨基酸,直至连完最后一个氨基酸,即得到抗菌肽CSTC24的序列,最后脱除N端Fmoc保护的氨基酸上面的保护基Fmoc,使N端裸露出来,并切除树脂,即得到纯化的抗菌肽CSTC24。经检测,所得抗菌肽的序列如SEQ ID No.1所示。本实施例的抗菌肽由苏州泰米克生物科技有限公司(苏州,中国)合成。
实施例2
抗菌肽CSTC24的应用
1)创伤弧菌、藤黄微球菌和金黄色葡萄球菌的制备。在LB培养基中培养创伤弧菌、藤黄微球菌和金黄色葡萄球菌分别至OD600为0.80,然后室温离心(5000g)10min,收集菌体,将其悬浮于LB中至终浓度为2×106CFU/ml。
所述PBS组成成分按重量百分比计:0.8%NaCl,0.02%KCl,0.358%,Na2HPO4.12H2O,0.024%NaH2PO4
2)抗菌肽CSTC24的杀菌活性。将50μl上述步骤1)的菌液加入96孔细胞培养板中,与倍比稀释的CSTC24或PBS混合,28℃培养24h。结果发现,CSTC24对创伤弧菌、藤黄微球菌和金黄色葡萄球菌的最小抑菌浓度分别为:300μM,5μM和40μM;最小杀菌浓度为:300μM,10μM和80μM,而PBS组则完全不能抑制细菌生长。
3)抗菌肽CSTC24的抗病毒活性。将95μM的CSTC24或PBS与1ml传染性脾肾坏死病毒(2×108CFU/ml)的PBS悬液混合,室温放置4h。将实验用鱼半滑舌鳎分成两组,每组15条,然后将传染性脾肾坏死病毒与CSTC24(实验组)或PBS(对照组)的混合物腹腔注射半滑舌鳎,在注射后3d和5d分别在无菌条件下取鱼的脾脏,提取基因组DNA,利用绝对荧光定量PCR检测病毒拷贝数。结果发现,与对照组相比,实验组病毒的拷贝数在感染后3d和5d分别下降了1.25和106倍。说明CSTC24对传染性脾肾坏死病毒具有显著的杀伤作用。
Figure BDA0001000208340000031
Figure IDA0001000208410000011

Claims (1)

1.一种如SEQ ID No.1所示的抗菌肽在制备抗病毒的药物中的应用,所述病毒为传染性脾肾坏死病毒。
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CN101400365A (zh) * 2005-05-06 2009-04-01 诺华有限公司 利用tfpi治疗严重细菌感染
CN102070711A (zh) * 2010-11-05 2011-05-25 中国科学院海洋研究所 组织因子途径抑制物及其制备和应用

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CN101400365A (zh) * 2005-05-06 2009-04-01 诺华有限公司 利用tfpi治疗严重细菌感染
CN102070711A (zh) * 2010-11-05 2011-05-25 中国科学院海洋研究所 组织因子途径抑制物及其制备和应用

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