Iron-regulated proteins (IRPS) of leptospira biflexa serovar Patoc strain Patoc I.

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dc.contributor.authorSritharan, Men_US
dc.contributor.authorAsuthkar, Sen_US
dc.date.accessioned2004-04-24en_US
dc.date.accessioned2009-05-28T09:11:34Z
dc.date.available2004-04-24en_US
dc.date.available2009-05-28T09:11:34Z
dc.date.issued2004-04-24en_US
dc.description.abstractBACKGROUND: Iron deficiency has been shown to induce the expression of siderophores and their receptors, the iron-regulated membrane proteins in a number of bacterial systems. In this study, the response of Leptospira biflexa serovar Patoc strain Patoc I to conditions of iron deprivation was assessed and the expression of siderophores and iron-regulated proteins is reported. MATERIALS AND METHODS: Two methods were used for establishing conditions of iron deprivation. One method consisted of addition of the iron chelators ethylenediamine-N, N'-diacetic acid (EDDA) and ethylenediamine di-o-hydroxyphenylacetic acid (EDDHPA) and the second method involved the addition of iron at 0.02 microg Fe/mL. Alternatively, iron sufficient conditions were achieved by omitting the chelators in the former method and adding 4 microg Fe/mL of the medium in the latter protocol. Triton X-114 extraction of the cells was done to isolate the proteins in the outer membrane (detergent phase), periplasmic space (aqueous phase) and the protoplasmic cylinder (cell pellet). The proteins were subjected to SDS-PAGE for analysis. RESULTS: In the presence of the iron-chelators, four iron-regulated proteins (IRPs) of apparent molecular masses of 82, 64, 60 and 33 kDa were expressed. The 82-kDa protein was seen only in the aqueous phase, while the other three proteins were seen in both the aqueous and detergent fractions. These proteins were not identified in organisms grown in the absence of the iron chelators. The 64, 60 and the 33 kDa proteins were also demonstrated in organisms grown in media with 0.02 microg Fe/mL. In addition, a 24 kDa protein was found to be down-regulated at this concentration of iron as compared to the high level of expression in organisms grown with 4 microg Fe/mL. The blue CAS agar plates with top agar containing 0.02microg Fe/mL showed a colour change to orange-red. CONCLUSION: The expression of siderophores and iron-regulated proteins under conditions of iron deprivation was demonstrated in the non-pathogenic L.biflexa serovar Patoc.en_US
dc.description.affiliationDepartment of Animal Sciences, School of Life Sciences, University of Hyderabad, Hyderabad - 500 046, India.en_US
dc.identifier.citationSritharan M, Asuthkar S. Iron-regulated proteins (IRPS) of leptospira biflexa serovar Patoc strain Patoc I. Indian Journal of Medical Microbiology. 2004 Apr-Jun; 22(2): 92-6en_US
dc.identifier.urihttps://imsear.searo.who.int/handle/123456789/53565
dc.language.isoengen_US
dc.source.urihttps://www.ijmm.orgen_US
dc.titleIron-regulated proteins (IRPS) of leptospira biflexa serovar Patoc strain Patoc I.en_US
dc.typeJournal Articleen_US
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