Throughout evolution, microbes have developed the ability to live in nearly every environmental condition on earth. They can grow with or without oxygen or light. Microbes can dissolve or precipitate ores and are able to yield energy from the reduction/oxidation of metal ions. Their metabolism depends on the availability of metal ions in essential amounts and protects itself from toxic amounts of metals by detoxification processes. Metals are metabolised to metallorgano-compounds, bound to proteins or used as catalytic centres of enzymes in biological reactions. Microbes, as every other cell, have developed a whole range of mechanisms for the uptake and excretion of metals and their metabolised compounds. The diversity of microbial metabolism can be illustrated by the fact that certain microbes can be found living on arsenate, which is considered a highly toxic metal for most other forms of live.
References
1.
NevinK.P., & LovleyD.R. (2000) Lack of production of electron-shuttling compounds or solubilization of Fe(III) during reduction of insoluble Fe(III) oxide by Geobacter metallireducens. App. Environ. Microbiol., 66, 2248–2251.
2.
NevinK.P., & LovleyD.R. (2002) Mechanisms for Fe (III) oxide reduction in sedimentary environments. Geomicrobiol. J., 19(2), 141–159.
3.
NevinK.P., & LovleyD.R. (20002) Mechanisms for accessing insoluble Fe(III) oxide during dissimilatory Fe(III) reduction by Geothrix fermentans. App. Environ. Microbiol., 68(5), 2294–2299.
4.
NewmanD.K., & KolterR. (2000) A role for excreted quinones in extracellular electron transfer. Nature405, 94–97.
5.
TurickC.E., TisaL.S., & CaccavoF. (2002) Melanin production and use as a soluble electron shuttle for Fe(III) oxide reduction and as a terminal electron acceptor by Shewanella algae BrY. App. Environ. Microbiol., 68(5), 2436–2444.
6.
LavermanA.M., BlumJ.S., SchaeferJ.K., PhilipsE.J.P., LovleyD.R., & OremlandR.S. (1995) Growth of strain SES-3 with arsenate and other diverse electron acceptors. App. Environ. Microbiol., 61, 3556–3561.
7.
BlumJ.S., BindiA.B., BuzzelliJ., StolzJ.F., & OremlandR.S. (1998) Bacillus arsenicoselenatis, sp nov, and Bacillus selenitireducens, sp nov: two haloalkaliphiles from Mono Lake, California that respire oxyanions of selenium and arsenic. Arch. Microbiol., 171(1), 19–30.
GihringT.M., & BanfieldJ.F. (2001) Arsenite oxidation and arsenate respiration by a new Thermus isolate. FEMS Microbiol. Lett., 204(2), 335–340.
10.
HerbelM.J., BlumJ.S., HoeftS.E., CohenS.M., ArnoldL.L., LisakJ., StolzJ.F., & OremlandR.S. (2002) Dissimilatory arsenate reductase activity and arsenate-respiring bacteria in bovine rumen fluid, hamster feces, and the termite hindgut. FEMS Microbiol. Ecol., 41(1), 59–67.
11.
HuberR., HuberH., & StetterK.O. (2000) Towards the ecology of hyperthermophiles: biotopes, new isolation strategies and novel metabolic properties. FEMS Microbiol. Rev., 24(5), 615–623.
12.
StolzJ.F. & OremlandR.S. (1999) Bacterial respiration of arsenic and selenium. FEMS Microbiol. Rev., 23, 615–627.
13.
HolmesD.E., FinneranK.T., O'NeilR.A., & LovleyD.R. (2002) Enrichment of members of the family Geobacteraceae associated with stimulation of dissimilatory metal reduction in uranium-contaminated aquifer sediments. App. Environ. Microbiol., 68(5), 2300–2306.
14.
NewmanD.K., BeveridgeT.J., & MorelF.M.M. (1997) Precipitation of arsenic trisulfide by Desulfotomaculum auripigmentum. App. Environ. Microbiol., 63(5), 2022–2028.
15.
GrunbergK., WawerC., TeboB.M., & SchulerD. (2001) A large gene cluster encoding several magnetosome proteins is conserved in different species of magnetotactic bacteria. App. Environ. Microbiol., 67(10), 4573–4582.
16.
MesserschmidtA., HuberR., PoulosT., & WieghardtK. (ed.). (2001) Handbook of metalloproteins I & II. different chaptersWiley & Sons, Chichester.
StybloM., Del RazoL.M., VegaL., GermolecD.R., LeCluyseE.L., HamiltonG.A., ReedW., WangC., CullenW.R., & ThomasD.J. (2000) Comparative toxicity of trivalent and pentavalent inorganic and methylated arsenicals in rat and human cells. Arch. Toxicol., 74(6), 289–299.
19.
KaiseT., & FukuiS. (1992) The chemical form and acute toxicity of arsenic compounds in marine organisms. Appl. Organomet. Chem., 6(2), 155–160.
20.
SilverS., BuddK., LeahyK.M., ShawW.V., HammondD., NovickR.P., WillskyG.R., MalamyM.H. & RosenbergH. (1981) Inducible plasmid determined resistance to arsenate, arsenite, and antimony(III) in Escherichia coli and Staphylococcus aureus.J. Bacteriol.146, 983–996.
21.
RosenB.P. (2002) Biochemistry of arsenic detoxification. FEBS Lett., 529(1), 86–92.
22.
FurrerJ.L., SandersD.N., Hook-BarnardI.G., & McIntoshM.A. (2002) Export of the siderophore enterobactin in Escherichia coli: involvement of a 43 kDa membrane exporter. Mol. Microbiol., 44(5), 1225–1234.
23.
MukundS., & AdamsM.W.W. (1999) Molybdenum and vanadium do not replace tungsten in the catalytically active forms of the three tungstoenzymes in the hyperthermophilic archaeon Pyrococcus furiosus. J. Bacteriol., 178(1), 163–167.
ZakharyanR.A., & AposhianH.V. (1999) Enzymatic reduction of arsenic compounds in mammalian systems: The Rate-Limiting Enzyme of Rabbit Liver Arsenic Biotransformation Is MMA V Reductase. Chem. Res. Toxicol., 12, 1278–1283.
27.
WildfangE., ZakharyanR.A., & AposhianH.V. (1998) Enzymatic methylation of arsenic compounds–VI. Characterization of hamster liver arsenite and methylarsonic acid methyltransferase activities in vitro. Toxicol. Appl. Pharmacol., 152(2), 366–375.
28.
CullenW.R., & ReimerK.J. (1989) Arsenic speciation in the environment. Chem. Rev., 89, 713–764.
29.
CastlehouseH., SmithC., RaabA., DeaconC., MehargA.A., & FeldmannJ. (2003) Biotransformation and Accumulation of Arsenic in Soil Amended with Seaweed. Environ. Sci. Technol.37, 951–957.
30.
FeldmannJ (2003) Volatilization of metals from a landfill site–Generation and immobilization of volatile species of tin, antimony, bismuth, mercury, arsenic, and tellurium on a municipal waste deposit in Delta, British Columbia, ACS Sym Ser 835, 128–140.
31.
HansenH.R., RaabA., FeldmannJ. (2003) New arsenosugar metabolite determined in urine by parallel use of HPLC-ICP-MS and HPLC-ESI-MS, J. Anal. At. Spectrom.18, 474–479.
32.
LangdonC., MehargA.A., FeldmannJ., BalgerT., CharnockJ., FarquharM., PiearceT., SempleK., Cotter-HowellsJ. (2002) Arsenic speciation in arsenate-resistant and non-resistant populations of the Earthworm, Lumbricus rubellus, J. Environ. Monit, 4, 603–608.
33.
TatkenR.L., & LewisR.J. (eds.) (1983) Registry of toxic effects chemical sub-stances. Report. Cincinnati, OH: US Department of Health and Human Services.
34.
KaiseT., Oya-OhtaY., OchiT., OkuboT., HanaokaK., IrgolicK.J., SakuraiT., & MatsubaraC. (1996) Toxicological study of organic arsenic com-pound in marine algae using mammalian cell culture technique. J. Food Hyg. Soc. Jpn., 37, 135–141.
