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Xiang, LK, Moore BS.  2005.  Biochemical characterization of a prokaryotic phenylalanine ammonia lyase. Journal of Bacteriology. 187:4286-4289.   10.1128/jb.187.12.4286-4289.2005   AbstractWebsite

The committed biosynthetic reaction to benzoyl-coenzyme A in the marine bacterium "Streptomyces maritimus" is carried out by the novel prokaryotic phenylalanine ammonia lyase (PAL) EncP, which converts the primary amino acid L-phenylalanine to trans-cinnamic acid. Recombinant EncP is specific for L-phenylalanine and shares many biochemical features with eukaryotic PALs, which are substantially larger proteins by 200 amino acid residues.

Kalaitzis, JA, Hamano Y, Nilsen G, Moore BS.  2003.  Biosynthesis and structural revision of neomarinone. Organic Letters. 5:4449-4452.   10.1021/ol035748b   AbstractWebsite

The biosynthesis of the meroterpenoid neomarinone from a marine actinomycete was probed through feeding experiments with C-13-labeled precursors. NMR characterization of [U-C-13(6)]glucose-enriched neomarinone led to the structural revision of structure 4a to 4b, which was confirmed by extensive 2D NMR spectrometry with unlabeled compound.

McKinnie, SMK, Miles ZD, Moore BS.  2018.  Characterization and biochemical assays of Streptomyces vanadium-dependent chloroperoxidases. Marine Enzymes and Specialized Metabolism, Pt A. 604( Moore BS, Ed.).:405-424., San Diego: Elsevier Academic Press Inc   10.1016/bs.mie.2018.02.016   Abstract

Vanadium-dependent haloperoxidases (VHPOs) are fascinating enzymes that facilitate electrophilic halogen incorporation into electron-rich substrates, simply requiring vanadate, a halide source, and cosubstrate hydrogen peroxide for activity. Initially characterized in fungi and red algae, VHPOs were long believed to have limited regio-, chemo-, and enantioselectivity in the production of halogenated metabolites. However, the recent discovery of homologues in the biosynthetic gene clusters of the stereo-selectively halogenated meroterpenoids from marine-derived Streptomyces bacteria has revised this paradigm. Their intriguing transformations have both enhanced and contributed to the fields of synthetic organic and natural product chemistry. We, herein, describe the expression, purification, and chemical assays of two characterized vanadium-dependent chloroperoxidase enzymes (NapH1 and Mcl24), and one homologue devoid of chlorination activity (NapH3), involved in the biosyntheses of halogenated meroterpenoid products.

Busch, J, Agarwal V, Schorn M, Machado H, Moore BS, Rouse GW, Gram L, Jensen PR.  2019.  Diversity and distribution of the bmp gene cluster and its Polybrominated products in the genus Pseudoalteromonas. Environmental Microbiology. 21:1575-1585.   10.1111/1462-2920.14532   AbstractWebsite

The production of pentabromopseudilin and related brominated compounds by Pseudoalteromonas spp. has recently been linked to the bmp biosynthetic gene cluster. This study explored the distribution and evolutionary history of this gene cluster in the genus Pseudoalteromonas. A phylogeny of the genus revealed numerous clades that do not contain type strains, suggesting considerable species level diversity has yet to be described. Comparative genomics revealed four distinct versions of the gene cluster distributed among 19 of the 101 Pseudoalteromonas genomes examined. These were largely localized to the least inclusive clades containing the Pseudoalteromonas luteoviolacea and Pseudoalteromonas phenolica type strains and show clear evidence of gene and gene cluster loss in certain lineages. Bmp gene phylogeny is largely congruent with the Pseudoalteromonas species phylogeny, suggesting vertical inheritance within the genus. However, the gene cluster is found in three different genomic environments suggesting either chromosomal rearrangement or multiple acquisition events. Bmp conservation within certain lineages suggests the encoded products are highly relevant to the ecology of these bacteria.

Roberts, AA, Schultz AW, Kersten RD, Dorrestein PC, Moore BS.  2012.  Iron acquisition in the marine actinomycete genus Salinispora is controlled by the desferrioxamine family of siderophores. Fems Microbiology Letters. 335:95-103.   10.1111/j.1574-6968.2012.02641.x   AbstractWebsite

Many bacteria produce siderophores for sequestration of growth-essential iron. Analysis of the Salinispora genomes suggests that these marine actinomycetes support multiple hydroxamate- and phenolate-type siderophore pathways. We isolated and characterized desferrioxamines (DFOs) B and E from all three recognized Salinispora species and linked their biosyntheses in S.similar to tropica CNB-440 and S.similar to arenicola CNS-205 to the des locus through PCR-directed mutagenesis. Gene inactivation of the predicted iron-chelator biosynthetic loci sid2-4 did not abolish siderophore chemistry. Additionally, these pathways could not restore the native growth characteristics of the des mutants in iron-limited media, although differential iron-dependent regulation was observed for the yersiniabactin-like sid2 pathway. Consequently, this study indicates that DFOs are the primary siderophores in laboratory cultures of Salinispora.

Moore, BS, Hertweck C, Hopke JN, Izumikawa M, Kalaitzis JA, Nilsen G, O'Hare T, Piel J, Shipley PR, Xiang LK, Austin MB, Noel JP.  2002.  Plant-like biosynthetic pathways in bacteria: From benzoic acid to chalcone. Journal of Natural Products. 65:1956-1962.   10.1021/np020230m   AbstractWebsite

Although phenylpropanoids and flavonoids are common plant natural products, these major classes of biologically active secondary metabolites are largely absent from bacteria. The ubiquitous plant enzymes phenylalanine ammonia-lyase (PAL) and chalcone synthase (CHS) are key biosynthetic catalysts in phenylpropanoid and flavonoid assembly, respectively. Until recently, few bacterial counterparts were known, thus reflecting the dearth of these plant natural products in bacteria. This review highlights our progress on the biochemical and genetic characterization of recently identified streptomycete biosynthetic pathways to benzoic acid and type III polyketide synthase (PKS)-derived products. The sediment-derived bacterium "Streptomyces maritimus" produces benzoyl-CoA in a plant-like manner from phenylalanine involving a PAL-mediated reaction through cinnamic acid during the biosynthesis of the polyketide antibiotic enterocin. All but one of the genes encoding benzoyl-CoA biosynthesis in "S. maritimus" have been cloned, sequenced, and inactivated, providing a model for benzoate biosynthesis not only in this bacterium, but in plants where benzoic acid is an important constituent of many products. The recent discovery that bacteria harbor homodimeric PKSs belonging to the plant CHS superfamily of condensing enzymes has further linked the biosynthetic capabilities of plants and bacteria. A bioinformatics approach led to the prediction that the model actinomycete Streptomyces coelicolor A3(2) contains up to three type III PKSs. Biochemical analysis of one of the recombinant type III PKSs from S. coelicolor demonstrated activity as a 1,3,6,8-tetrahydroxynaphthalene synthase (THNS). A homology model of THNS based upon the known three-dimensional structure of CHS was constructed to explore the structural and mechanistic details of this new subclass of bacterial PKSs.