Induction of Cr(VI) reduction activity in an Anoxybacillus strain under heat stress: a biochemical and proteomic study.

Abstract:

:A bacterial strain, designated as TSB-6, was isolated from the sediments of a Tantloi (India) hot spring at 65 °C. The strain showed 98% 16S rRNA gene sequence similarity with Anoxybacillus kualawohkensis strain KW12 and was found to grow optimally at 37 °C. However, growing cells, cell suspensions, and cell-free extracts from 65 °C cultures showed higher Cr(VI) reduction activities when assayed at either 37 or 65 °C than those obtained from 37 °C cultures. On fractionation of extracts from cells grown at 65 °C, the chromate reductase activity assayed at 65 °C was found mostly in the soluble fraction. When log-phase cells growing at 37 °C were shifted to 65 °C, the stressed cells produced larger quantities of reactive oxygen species. Consequently, growth of the cells was retarded, but specific Cr(VI) reduction activity increased. 2D gel electrophoresis followed by MALDI-TOF MS/MS identified the proteins whose expression level changed as a result of heat stress. The upregulated set included proteins involved in cellular metabolism of sugar, nucleotide, amino acids, lipids and vitamins, oxidoreductase activity, and protein folding. The downregulated proteins are also involved in cellular metabolism, DNA binding, and environmental signal processing.

journal_name

FEMS Microbiol Lett

authors

Paul SC,Jain P,Mitra J,Dutta S,Bhattacharya P,Bal B,Bhattacharyya D,Das Gupta S,Pal S

doi

10.1111/j.1574-6968.2012.02555.x

subject

Has Abstract

pub_date

2012-06-01 00:00:00

pages

70-80

issue

1

eissn

0378-1097

issn

1574-6968

journal_volume

331

pub_type

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