Response and tolerance of toxigenic Vibro cholerae O1 to cold

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1、AntonievanLeeuwenhoek79:377384,2001.377©2001KluwerAcademicPublishers.PrintedintheNetherlands.ResponseandtoleranceoftoxigenicVibrocholeraeO1tocoldtemperaturesJeffreyW.Carroll1,MadalinaC.Mateescu1,KiranChava1,RitaR.Colwell2,3&AsimK.Bej1,∗1DepartmentofBiology,1300UniversityBo

2、ulevard,UniversityofAlabamaatBirmingham,Birmingham,AL35294-1170,USA;2DepartmentofCellandMolecularBiology,UniversityofMaryland,CollegePark,MD20742,USA;3CenterforMarineBiotechnology,UniversityofMarylandBiotechnologyInstitute,PrattStreet,Baltimore,MD21202-3101,USA(∗Authorforc

3、orrespondence;Tel:+1-205-934-9857;Fax:+1-205-975-6097;E-mail:abej@uab.edu)Received15December;accepted15December2000Keywords:VibriocholeraeO1,coldadaptation,waterbornepathogen,choleratoxin,cspAAbstractSurvivalandtoleranceatcoldtemperatures,thedifferentiallyexpressedcellular

4、proteins,andcholeratoxin(CTX)productionwereevaluatedinVibriocholeraeO1.Rapidlossofculturabilityandchangetodistinctcoccoidmor-phologyoccurredwhenculturesofV.choleraeO1wereexposedto5◦Cdirectlyfrom35◦C.Also,culturesofV.choleraefirstexposedto15◦Cfor2handthenmaintainedat5◦Cfaile

5、dtoexhibitanadaptiveresponse,insteadarapidlossofviableplatecountwasnoticed.ResultsfromWesternblotexperimentsrevealedtheabsenceofamajorcoldshockprotein,CS7.4.Also,adecreasedlevelofCTXwasnoticedinV.choleraeO1culturesexposedto5or15◦Cafterfirstbeingexposedto15◦Cfor2h,followedby

6、transferto5◦C.ReducedexpressionofCTXatcoldtemperatures,comparedtotheculturesmaintainedat35◦C,maybearesultofdecreasedcellularmetabolicactivity.WhenV.choleraeO1cultureswereexposedto15◦Cfor2h,elevatedexpressionsof8,26and194kDa,anddecreasedexpressionof28and183kDaproteinsoccurr

7、ed.Itissuggestedthatthesedifferentiallyexpressedcold-responsiveproteinsareinvolvedinregulatingculturabilityandconversiontoacoccoidcellmorphologyinV.choleraeO1.IntroductionSeasonaldisappearanceoftoxigenicstrainsofV.choleraeO1frombothhumanpopulationsandfromVibriocholeraeO1,a

8、Gram-negativebacterium,istheenvironmentincholeraendemicregionshavethecausativeagentofchol