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Functional and Structural Insights into a Novel Promiscuous Ketoreductase of the Lugdunomycin Biosynthetic Pathway.

Abstract：

:Angucyclines are a structurally diverse class of actinobacterial natural products defined by their varied polycyclic ring systems, which display a wide range of biological activities. We recently discovered lugdunomycin (1), a highly rearranged polyketide antibiotic derived from the angucycline backbone that is synthesized via several yet unexplained enzymatic reactions. Here, we show via in vivo, in vitro, and structural analysis that the promiscuous reductase LugOII catalyzes both a C6 and an unprecedented C1 ketoreduction. This then sets the stage for the subsequent C-ring cleavage that is key to the rearranged scaffolds of 1. The 1.1 Å structures of LugOII in complex with either ligand 8-O-Methylrabelomycin (4) or 8-O-Methyltetrangomycin (5) and of apoenzyme were resolved, which revealed a canonical Rossman fold and a remarkable conformational change during substrate capture and release. Mutational analysis uncovered key residues for substrate access, position, and catalysis as well as specific determinants that control its dual functionality. The insights obtained in this work hold promise for the discovery and engineering of other promiscuous reductases that may be harnessed for the generation of novel biocatalysts for chemoenzymatic applications.

journal_name

ACS Chem Biol

journal_title

ACS chemical biology

authors

Xiao X,Elsayed SS,Wu C,van der Heul HU,Metsä-Ketelä M,Du C,Prota AE,Chen CC,Liu W,Guo RT,Abrahams JP,van Wezel GP

doi

10.1021/acschembio.0c00564

subject

Has Abstract

pub_date

2020-09-18 00:00:00

pages

2529-2538

issue

9

eissn

1554-8929

issn

1554-8937

journal_volume

15

pub_type

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