Volume 58, Issue 37 pp. 12930-12934
Communication

Perquinolines A–C: Unprecedented Bacterial Tetrahydroisoquinolines Involving an Intriguing Biosynthesis

Dr. Yuriy Rebets

Dr. Yuriy Rebets

Department of Pharmacy, Pharmaceutical Biotechnology, University of Saarland, Campus, Bld. C2 3, Saarbrucken, 66123 Germany

These authors contributed equally to this work.

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Dr. Suvd Nadmid

Dr. Suvd Nadmid

Department of Pharmacy, Pharmaceutical Biotechnology, University of Saarland, Campus, Bld. C2 3, Saarbrucken, 66123 Germany

These authors contributed equally to this work.

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Dr. Constanze Paulus

Dr. Constanze Paulus

Department of Pharmacy, Pharmaceutical Biotechnology, University of Saarland, Campus, Bld. C2 3, Saarbrucken, 66123 Germany

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Charlotte Dahlem

Charlotte Dahlem

Department of Pharmacy, Pharmaceutical Biology, University of Saarland, Campus, Bld. C2 3, Saarbrucken, 66123 Germany

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Dr. Jennifer Herrmann

Dr. Jennifer Herrmann

Department Microbial Natural Products, Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), Campus, Bld. 8 1, Saarbrucken, 66123 Germany

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Dr. Harald Hübner

Dr. Harald Hübner

Department of Chemistry and Pharmacy, Friedrich-Alexander-Universität Erlangen-Nürnberg, Nikolaus-Fiebiger-Strasse 10, 91058 Erlangen, Germany

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Dr. Christian Rückert

Dr. Christian Rückert

Center for Biotechnology—CeBiTec, University of Bielefeld, Universitätsstraße 25, 33615 Bielefeld, Germany

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Prof. Dr. Alexandra K. Kiemer

Prof. Dr. Alexandra K. Kiemer

Department of Pharmacy, Pharmaceutical Biology, University of Saarland, Campus, Bld. C2 3, Saarbrucken, 66123 Germany

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Prof. Dr. Peter Gmeiner

Prof. Dr. Peter Gmeiner

Department of Chemistry and Pharmacy, Friedrich-Alexander-Universität Erlangen-Nürnberg, Nikolaus-Fiebiger-Strasse 10, 91058 Erlangen, Germany

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Prof. Dr. Jörn Kalinowski

Prof. Dr. Jörn Kalinowski

Center for Biotechnology—CeBiTec, University of Bielefeld, Universitätsstraße 25, 33615 Bielefeld, Germany

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Prof. Dr. Rolf Müller

Prof. Dr. Rolf Müller

Department Microbial Natural Products, Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), Campus, Bld. 8 1, Saarbrucken, 66123 Germany

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Prof. Dr. Andriy Luzhetskyy

Corresponding Author

Prof. Dr. Andriy Luzhetskyy

Department of Pharmacy, Pharmaceutical Biotechnology, University of Saarland, Campus, Bld. C2 3, Saarbrucken, 66123 Germany

Department Microbial Natural Products, Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), Campus, Bld. 8 1, Saarbrucken, 66123 Germany

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First published: 16 July 2019
Citations: 13

Graphical Abstract

As easy as A,B,C: A new biosynthetic pathway for the tetrahydroisoquinolines perquinolines A–C starts with the condensation of succinyl-CoA and l-phenylalanine catalyzed by the AONS-like enzyme PqrA. The second condensation and cyclization events are mediated by the PqrG enzyme. An ATP-grasp RimK-type ligase PqrI completes the synthesis by transfer of a γ-aminobutyric acid or β-alanine moiety.

Abstract

Metabolic profiling of Streptomyces sp. IB2014/016-6 led to the identification of three new tetrahydroisoquinoline natural products, perquinolines A–C (13). Labelled precursor feeding studies and the cloning of the pqr biosynthetic gene cluster revealed that 13 are assembled by the action of several unusual enzymes. The biosynthesis starts with the condensation of succinyl-CoA and l-phenylalanine catalyzed by the amino-7-oxononanoate synthase-like enzyme PqrA, representing rare chemistry in natural product assembly. The second condensation and cyclization events are conducted by PqrG, an enzyme resembling an acyl-CoA ligase. Last, ATP-grasp RimK-type ligase PqrI completes the biosynthesis by transferring a γ-aminobutyric acid or β-alanine moiety. The discovered pathway represents a new route for assembling the tetrahydroisoquinoline cores of natural products.

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