The mcyF gene of the microcystin biosynthetic gene cluster from Microcystis aeruginosa encodes an aspartate racemase
Microcystins are hepatotoxic, non-ribosomal peptides produced by several genera of freshwater cyanobacteria. Among other enzymic activities, in particular those of peptide synthetases and polyketide synthases, microcystin biosynthesis requires racemases that provide D-aspartate and D-glutamate. Here...
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| Veröffentlicht in: | Biochemical journal 2003-08, Vol.373 (Pt 3), p.909-916 |
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| container_title | Biochemical journal |
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| creator | Sielaff, Heike Dittmann, Elke Tandeau De Marsac, Nicole Bouchier, Christiane Von Döhren, Hans Börner, Thomas Schwecke, Torsten |
| description | Microcystins are hepatotoxic, non-ribosomal peptides produced by several genera of freshwater cyanobacteria. Among other enzymic activities, in particular those of peptide synthetases and polyketide synthases, microcystin biosynthesis requires racemases that provide D-aspartate and D-glutamate. Here, we report on the cloning, expression and characterization of an open reading frame, mcyF, that is part of the mcy gene cluster involved in microcystin biosynthesis in the Microcystis aeruginosa strain PCC 7806. Conserved amino acid sequence motifs suggest a function of the McyF protein as an aspartate racemase. Heterologous expression of mcyF in the unicellular cyanobacterium Synechocystis PCC 6803 yielded an active His(6)-tagged protein that was purified to homogeneity by Ni(2+)-nitriloacetate affinity chromatography. The purified recombinant protein racemized in a pyridoxal-5'-phosphate-independent manner L-aspartate, but not L-glutamate. Furthermore, we have identified a putative glutamate racemase gene that is located outside the mcy gene cluster in the M. aeruginosa PCC 7806 genome. Whereas homologues of this glutamate racemase gene are present in all the Microcystis strains examined, mcyF could only be detected in microcystin-producing strains. |
| doi_str_mv | 10.1042/bj20030396 |
| format | Article |
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Among other enzymic activities, in particular those of peptide synthetases and polyketide synthases, microcystin biosynthesis requires racemases that provide D-aspartate and D-glutamate. Here, we report on the cloning, expression and characterization of an open reading frame, mcyF, that is part of the mcy gene cluster involved in microcystin biosynthesis in the Microcystis aeruginosa strain PCC 7806. Conserved amino acid sequence motifs suggest a function of the McyF protein as an aspartate racemase. Heterologous expression of mcyF in the unicellular cyanobacterium Synechocystis PCC 6803 yielded an active His(6)-tagged protein that was purified to homogeneity by Ni(2+)-nitriloacetate affinity chromatography. The purified recombinant protein racemized in a pyridoxal-5'-phosphate-independent manner L-aspartate, but not L-glutamate. Furthermore, we have identified a putative glutamate racemase gene that is located outside the mcy gene cluster in the M. aeruginosa PCC 7806 genome. 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Among other enzymic activities, in particular those of peptide synthetases and polyketide synthases, microcystin biosynthesis requires racemases that provide D-aspartate and D-glutamate. Here, we report on the cloning, expression and characterization of an open reading frame, mcyF, that is part of the mcy gene cluster involved in microcystin biosynthesis in the Microcystis aeruginosa strain PCC 7806. Conserved amino acid sequence motifs suggest a function of the McyF protein as an aspartate racemase. Heterologous expression of mcyF in the unicellular cyanobacterium Synechocystis PCC 6803 yielded an active His(6)-tagged protein that was purified to homogeneity by Ni(2+)-nitriloacetate affinity chromatography. The purified recombinant protein racemized in a pyridoxal-5'-phosphate-independent manner L-aspartate, but not L-glutamate. Furthermore, we have identified a putative glutamate racemase gene that is located outside the mcy gene cluster in the M. aeruginosa PCC 7806 genome. 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Among other enzymic activities, in particular those of peptide synthetases and polyketide synthases, microcystin biosynthesis requires racemases that provide D-aspartate and D-glutamate. Here, we report on the cloning, expression and characterization of an open reading frame, mcyF, that is part of the mcy gene cluster involved in microcystin biosynthesis in the Microcystis aeruginosa strain PCC 7806. Conserved amino acid sequence motifs suggest a function of the McyF protein as an aspartate racemase. Heterologous expression of mcyF in the unicellular cyanobacterium Synechocystis PCC 6803 yielded an active His(6)-tagged protein that was purified to homogeneity by Ni(2+)-nitriloacetate affinity chromatography. The purified recombinant protein racemized in a pyridoxal-5'-phosphate-independent manner L-aspartate, but not L-glutamate. Furthermore, we have identified a putative glutamate racemase gene that is located outside the mcy gene cluster in the M. aeruginosa PCC 7806 genome. 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| subjects | Amino Acid Isomerases - chemistry Amino Acid Isomerases - genetics Amino Acid Isomerases - metabolism Amino Acid Sequence Base Sequence Cyanophyta DNA Primers Freshwater mcyF gene Microcystins Microcystis - enzymology Microcystis - genetics Microcystis aeruginosa Molecular Sequence Data Multigene Family peptide synthase Peptides, Cyclic - biosynthesis polyketide synthase Recombinant Proteins - chemistry Recombinant Proteins - genetics Recombinant Proteins - metabolism Sequence Homology, Amino Acid Substrate Specificity |
| title | The mcyF gene of the microcystin biosynthetic gene cluster from Microcystis aeruginosa encodes an aspartate racemase |
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