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1、分支杆菌噬菌体Chy2的分离及生物学特性研究刘平,邬亭亭,彭丽,郭述良*,罗永艾(400016重庆,重庆医科大学附属第一医院呼吸科)[摘要]目的分离鉴定新分支杆菌噬菌体并研究其生物学特性。方法以平板法从泥土中分离纯化噬菌体,紫外线诱导法鉴定溶原性,从噬菌斑大小,颗粒形态和限制性内切酶分析3方面比较Chy2、D29、TM4异同;以不同感染复数(MOI)扩增Chy2,测定最佳MOI;通过一步生长实验测出Chy2潜伏期、裂解期和裂解量;采用单斑法测定MOI的裂解谱;检测MOI在不同pH值培养基中裂解耻垢分支杆菌mc2155的能力。结果成功分离纯化1株分支杆菌噬菌体,命名为Chy2,
2、其噬菌斑圆形透明,紫外线诱导法处理宿主菌后不能形成噬菌斑,头部呈椭圆形,长尾,基因组核酸能被双链DNA内切酶EcoRⅠ、HindⅢ、BamHI及XbaI切开,大小约54kb,与D29、TM4差异大;Chy2最佳MOI为9.58×10-5;Chy2一步生长周期为270min,潜伏期210min,裂解期60min,裂解量为23;Chy2能裂解耻垢分支杆菌mc2155、结核菌标准株H37Rv、多数临床耐药株;在7H9固体培养基pH值为5.0和7.4时,Chy2均能裂解耻垢分支杆菌mc2155。结论Chy2属长尾噬菌体科,基因组为双链DNA,宽噬谱广,是一种潜在的抗结核药物资源。[关
3、键词]分支杆菌噬菌体;耻垢分支杆菌;结核分支杆菌;生物学特性;耐药结核病[中图分类号]R52IsolationandbiologicalcharacteristicsofMycobacteriophageChy2LiuPing,WuTingting,PengLi,GuoShuliang,LuoYongai(DepartmentofRespiratoryMedicine,theFirstAffiliatedHospitalofChongqingMedicalUniversity,Chongqing,400016,China)[Abstract]ObjectiveToisolat
4、eandidentifyanewmycobacteriophageandresearchonthebiologicalcharacteristicstoexploreitspotentialofanti-TBtreatment.MethodsThenewmycobacteriophagewasisolatedandpurifiedbysingle-platemethodfromthesoil.Thephagewasinducedbyultravioletray(UV)toidentifyitslyticorlysogeniccapacity.Chy2,D29andTM4wer
5、ecomparedbytheplaquesize,particlemorphologyandtherestrictionenzymeanalysis.Thephagewasamplifiedbydouble-layeragarplatemethodindifferentmultiplicityofinfectiontofindtheoptimalMOI.Onestepgrowthexperimentwasdonetofindthelatentperiod,burstperiodandburstsizeofthephage.Thehostrangeofthephagewasex
6、aminedbysingle-spotexamination.TheabilityofthephagetocrackMycobacteriumsmegmatismc2155atdifferentpHvalueswasexamined.ResultsAnewmycobacteriophagewassuccessfullyisolatedandpurified,whichwasnamedChy2.TheplaquesofChy2aretransparentandtheirsizesareabout3mminthediameter,ThehostbacteriainducedbyU
7、Vcannotformplaques.Chy2hasaovalhead,alongtail,baseplateandtailfiber.Chy2isdigestedbyrestrictionendonucleaseEcoRⅠ,HindⅢ,BamHIandXbaIandthesizeofgenomeisabout54kb.Chy2isdifferentfromD29,TM4intheplaquesize,particlemorphologyandtherestrictionenzymeanalysis.T