title: Isolation and characterization of arsenic resistant bacteria from wastewater.
abstract: The present study proposed the isolation of arsenic resistant bacteria from wastewater. Only three bacterial isolates (MNZ1, MNZ4 and MNZ6) were able to grow in high concentrations of arsenic. The minimum inhibitory concentrations of arsenic against MNZ1, MNZ4 and MNZ6 were 300 mg/L, 300 mg/L and 370 mg/L respectively. The isolated strains showed maximum growth at 37 °C and at 7.0 pH in control but in arsenite stress Luria Bertani broth the bacterial growth is lower than control. All strains were arsenite oxidizing. All strains were biochemically characterized and ribotyping (16S rRNA) was done for the purpose of identification which confirmed that MNZ1 was homologous to Enterobacter sp. while MNZ4 and MNZ6 showed their maximum homology with Klebsiella pneumoniae. The protein profiling of these strains showed in arsenic stressed and non stressed conditions, so no bands of induced proteins appeared in stressed conditions. The bacterial isolates can be exploited for bioremediation of arsenic containing wastes, since they seem to have the potential to oxidize the arsenite (more toxic) into arsenate (less toxic) form.
authors.affiliation: Division of Environmental Technology School of Industrial Technology Universiti Sains MalaysiaPenang Malaysia Division of Environmental Technology, School of Industrial Technology, Universiti Sains Malaysia, Penang, Malaysia. ; Department of Zoology Government College University Lahore Pakistan Department of Zoology, Government College University, Lahore, Pakistan.
authors.forename: Syed Zaghum
authors.initials: SZ
authors.lastname: Abbas
authors.affiliation: Department of Zoology Government College University Lahore Pakistan Department of Zoology, Government College University, Lahore, Pakistan.
authors.forename: Mehwish
authors.initials: M
authors.lastname: Riaz
authors.affiliation: Department of Zoology Government College University Lahore Pakistan Department of Zoology, Government College University, Lahore, Pakistan.
authors.forename: Naseem
authors.initials: N
authors.lastname: Ramzan
authors.affiliation: Department of Zoology Government College University Lahore Pakistan Department of Zoology, Government College University, Lahore, Pakistan.
authors.forename: M Tariq
authors.initials: MT
authors.lastname: Zahid
authors.affiliation: Department of Microbiology and Molecular Genetics School of Biological Sciences University of the Punjab Lahore Pakistan Department of Microbiology and Molecular Genetics, School of Biological Sciences, University of the Punjab, Lahore, Pakistan.
authors.forename: Farah R
authors.initials: FR
authors.lastname: Shakoori
authors.affiliation: Division of Environmental Technology School of Industrial Technology Universiti Sains MalaysiaPenang Malaysia Division of Environmental Technology, School of Industrial Technology, Universiti Sains Malaysia, Penang, Malaysia.
authors.forename: Mohd
authors.initials: M
authors.lastname: Rafatullah
mesh_terms: D000900:Anti-Bacterial Agents / Q000378:metabolism*; D001151:Arsenic / Q000378:metabolism*; D018053:Arsenites / Q000378:metabolism; D004275:DNA, Ribosomal / Q000737:chemistry / Q000235:genetics; D024881:Drug Resistance, Bacterial; D004754:Enterobacter / Q000145:classification / Q000187:drug effects* / Q000254:growth & development / Q000302:isolation & purification; D006863:Hydrogen-Ion Concentration; D007711:Klebsiella pneumoniae / Q000145:classification / Q000187:drug effects* / Q000254:growth & development / Q000302:isolation & purification; D008826:Microbial Sensitivity Tests; D010084:Oxidation-Reduction; D020543:Proteome / Q000032:analysis; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D021521:Ribotyping; D013696:Temperature; D062065:Wastewater / Q000382:microbiology*
chemical_list: D000900:Anti-Bacterial Agents; D001151:Arsenic; D018053:Arsenites; D004275:DNA, Ribosomal; D020543:Proteome; D012336:RNA, Ribosomal, 16S; D062065:Wastewater
keywords: Arsenite oxidizing bacteria; Bioremediation. Enterobacter sp.; Klebsiella pneumoniae