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Title of Journal: World J Microbiol Biotechnol

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Abbravation: World Journal of Microbiology and Biotechnology

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Springer Netherlands

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10.1016/0963-6897(96)00081-4

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1573-0972

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Emphasis Type="Italic"chr/Emphasis genes from

Authors: Rosa I ReyesGallegos Martha I RamírezDíaz Carlos Cervantes
Publish Date: 2016/02/12
Volume: 32, Issue: 3, Pages: 45-
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Abstract

The chromate ion transporter CHR superfamily includes proteins that confer chromate resistance by extruding toxic chromate ions from cytoplasm Burkholderia xenovorans strain LB400 encodes six CHR homologues in its multireplicon genome and has been reported as highly chromateresistant The objective of this work was to analyze the involvement of chr redundant genes in chromate resistance by LB400 It was found that B xenovorans plant rhizosphere strains lacking the megaplasmid are chromatesensitive suggesting that the chr gene present in this replicon is responsible for the chromateresistance phenotype of the LB400 strain Transformation of a chromatesensitive B xenovorans strain with each of the six cloned LB400 chr genes showed that genes from ‘adaptive replicons’ chrA1b and chr1NCb from chromosome 2 and chrA2 from the megaplasmid conferred higher chromate resistance levels than chr genes from ‘central’ chromosome 1 chrA1a chrA6 and chr1NCa An LB400 insertion mutant affected in the chrA2 gene displayed a chromatesensitive phenotype which was fully reverted by transferring the chrA2 wildtype gene and partially reverted by chrA1b or chr1NCb genes These data indicate that chr genes from adaptive replicons mainly chrA2 from the megaplasmid are responsible for the B xenovorans LB400 chromateresistance phenotype

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