Biogeochemical cyclic activity of bacterial arsB in arsenic-contaminated mines
CHANG Jin-Soo , REN Xianghao , KIM Kyoung-Woong
DOI:
Received November 05, 2007,Revised March 12, 2008, Accepted , Available online
Volume 20,2008,Pages 1348-1355
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Biogeochemical cyclic activity of the ars (arsenic resistance system) operon is arsB influx/e ux encoded by the ecological
of Pseudomonas putida. This suggests that studying arsenite-oxidizing bacteria may lead to a better understanding of molecular
geomicrobiology, which can be applied to the bioremediation of arsenic-contaminated mines. This is the first report in which multiple
arsB-binding mechanisms have been used on indigenous bacteria. In ArsB (strains OS-5; ABB83931; OS-19; ABB04282 and RW-28;
ABB88574), there are ten putative enzyme, Histidine (His) 131, His 133, His 137, Arginine (Arg) 135, Arg 137, Arg 161, Trptohan
(Trp) 142, Trp 164, Trp 166, and Trp 171, which are each located in di erent regions of the partial sequence. The adenosine triphosphate
(ATP)-binding cassette transports, binding a nities and associating ratable constants show that As-binding is comparatively insensitive
to the location of the residues within the moderately stable -helical structure. The -helical structures in ArsB-permease and anion
permease arsB have been shown to import/export arsenic in P. putida. We proposed that arsB residues, His 131, His 133, His 137, Arg
135, Arg 137, Arg 161, Trp 142, Trp 164, Trp 166, and Trp 171 are required for arsenic binding and activation of arsA/arsB or arsAB.
This arsB influx/e ux pum-ping is important, and the e ect in arsenic species change and mobility in mine soil has got a significantly
ecological role because it allows arsenic oxidizing/reducing bacteria to control biogeochemical cycle of abandoned mines.
