Genome mining of cyanide-degrading nitrilases from filamentous fungi

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dc.contributor.authorBasile, Lacy J
dc.contributor.authorWilson, Richard C
dc.contributor.authorSewell, B. Trevor
dc.contributor.authorBenedik, Michael J
dc.date.accessioned2016-09-05T18:30:54Z
dc.date.available2016-09-05T18:30:54Z
dc.date.issued2008
dc.date.updated2016-09-05T13:22:29Z
dc.description.abstractA variety of fungal species are known to degrade cyanide through the action of cyanide hydratases, a specialized subset of nitrilases which hydrolyze cyanide to formamide. In this paper, we report on two previously unknown and uncharacterized cyanide hydratases from Neurospora crassa and Aspergillus nidulans. Recombinant forms of four cyanide hydratases from N. crassa, A. nidulans, Gibberella zeae, and Gloeocercospora sorghi were prepared after their genes were cloned with N-terminal hexahistidine purification tags, expressed in Escherichia coli, and purified using immobilized metal affinity chromatography. These enzymes were compared according to their relative specific activity, pH activity profiles, thermal stability, and ability to remediate cyanide contaminated waste water from silver and copper electroplating baths. Although all four were similar, the N. crassa cyanide hydratase (CHT) has the greatest thermal stability and widest pH range of >50% activity. N. crassa also demonstrated the highest rate of cyanide degradation in the presence of both heavy metals. The CHT of A. nidulans has the highest reaction rate of the four fungal nitrilases evaluated in this work. These data will help determine optimization procedures for the possible use of these enzymes in the bioremediation of cyanide-containing waste. Similar to known plant pathogenic fungi, both N. crassa and A. nidulans were induced to express CHT by growth in the presence of KCN.en_ZA
dc.identifierhttp://dx.doi.org/10.1007/s00253-008-1559-2
dc.identifier.apacitationBasile, L. J., Wilson, R. C., Sewell, B. Trevor., & Benedik, M. J. (2008). Genome mining of cyanide-degrading nitrilases from filamentous fungi. <i>Applied Microbiology and Biotechnology</i>, http://hdl.handle.net/11427/21671en_ZA
dc.identifier.chicagocitationBasile, Lacy J, Richard C Wilson, B. Trevor Sewell, and Michael J Benedik "Genome mining of cyanide-degrading nitrilases from filamentous fungi." <i>Applied Microbiology and Biotechnology</i> (2008) http://hdl.handle.net/11427/21671en_ZA
dc.identifier.citationBasile, L. J., Willson, R. C., Sewell, B. T., & Benedik, M. J. (2008). Genome mining of cyanide-degrading nitrilases from filamentous fungi. Applied microbiology and biotechnology, 80(3), 427-435.en_ZA
dc.identifier.issn0175-7598en_ZA
dc.identifier.ris TY - Journal Article AU - Basile, Lacy J AU - Wilson, Richard C AU - Sewell, B. Trevor AU - Benedik, Michael J AB - A variety of fungal species are known to degrade cyanide through the action of cyanide hydratases, a specialized subset of nitrilases which hydrolyze cyanide to formamide. In this paper, we report on two previously unknown and uncharacterized cyanide hydratases from Neurospora crassa and Aspergillus nidulans. Recombinant forms of four cyanide hydratases from N. crassa, A. nidulans, Gibberella zeae, and Gloeocercospora sorghi were prepared after their genes were cloned with N-terminal hexahistidine purification tags, expressed in Escherichia coli, and purified using immobilized metal affinity chromatography. These enzymes were compared according to their relative specific activity, pH activity profiles, thermal stability, and ability to remediate cyanide contaminated waste water from silver and copper electroplating baths. Although all four were similar, the N. crassa cyanide hydratase (CHT) has the greatest thermal stability and widest pH range of >50% activity. N. crassa also demonstrated the highest rate of cyanide degradation in the presence of both heavy metals. The CHT of A. nidulans has the highest reaction rate of the four fungal nitrilases evaluated in this work. These data will help determine optimization procedures for the possible use of these enzymes in the bioremediation of cyanide-containing waste. Similar to known plant pathogenic fungi, both N. crassa and A. nidulans were induced to express CHT by growth in the presence of KCN. DA - 2008 DB - OpenUCT DP - University of Cape Town J1 - Applied Microbiology and Biotechnology LK - https://open.uct.ac.za PB - University of Cape Town PY - 2008 SM - 0175-7598 T1 - Genome mining of cyanide-degrading nitrilases from filamentous fungi TI - Genome mining of cyanide-degrading nitrilases from filamentous fungi UR - http://hdl.handle.net/11427/21671 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/21671
dc.identifier.vancouvercitationBasile LJ, Wilson RC, Sewell B Trevor, Benedik MJ. Genome mining of cyanide-degrading nitrilases from filamentous fungi. Applied Microbiology and Biotechnology. 2008; http://hdl.handle.net/11427/21671.en_ZA
dc.languageengen_ZA
dc.publisherSpringeren_ZA
dc.publisher.institutionUniversity of Cape Town
dc.sourceApplied Microbiology and Biotechnologyen_ZA
dc.source.urihttp://link.springer.com/journal/253
dc.subject.otherCyanide
dc.subject.otherCyanide hydratase
dc.subject.otherBioremediation
dc.titleGenome mining of cyanide-degrading nitrilases from filamentous fungien_ZA
dc.typeJournal Articleen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceArticleen_ZA
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