Generation of incednine derivatives by mutasynthesis.

The macrolactam antibiotic incednine, isolated from Streptomyces sp. ML694-90F3, contains a (S)-3-aminobutyric acid moiety in its polyketide aglycon. In this study, we performed mutasynthesis to generate incednine derivatives. We successfully obtained 28-methylincednine by feeding 3-aminopentanoic acid into culture of a strain in which the glutamate 2,3-aminomutase gene idnL4, whose product is responsible for supplying 3-aminobutyric acid, was disrupted. 28-Methylincednine showed similar suppressive activity of the antiapoptotic function of oncoprotein Bcl-xL to that of incednine. Thus, this study highlights the applicability of the mutasynthesis approach in generation of novel ß-amino acid-containing macrolactam polyketide derivatives.

Biochemical characterization and structural insight into aliphatic ß-amino acid adenylation enzymes IdnL1 and CmiS6.

Macrolactam antibiotics such as incednine and cremimycin possess an aliphatic ß-amino acid as a starter unit of their polyketide chain. In the biosynthesis of incednine and cremimycin, unique stand-alone adenylation enzymes IdnL1 and CmiS6 select and activate the proper aliphatic ß-amino acid as a starter unit. In this study, we describe the enzymatic characterization and the structural basis of substrate specificity of IdnL1 and CmiS6. Functional analysis revealed that IdnL1 and CmiS6 recognize 3-aminobutanoic acid and 3-aminononanoic acid, respectively. We solved the X-ray crystal structures of IdnL1 and CmiS6 to understand the recognition mechanism of these aliphatic ß-amino acids. These structures revealed that IdnL1 and CmiS6 share a common recognition motif that interacts with the ß-amino group of the substrates. However, the hydrophobic side-chains of the substrates are accommodated differently in the two enzymes. IdnL1 has a bulky Leu220 located close to the terminal methyl group of 3-aminobutanoate of the trapped acyl-adenylate intermediate to construct a shallow substrate-binding pocket. In contrast, CmiS6 possesses Gly220 at the corresponding position to accommodate 3-aminononanoic acid. This structural observation was supported by a mutational study. Thus, the size of amino acid residue at the 220 position is critical for the selection of an aliphatic ß-amino acid substrate in these adenylation enzymes. Proteins 2017; 85:1238-1247. © 2017 Wiley Periodicals, Inc.

A unique amino transfer mechanism for constructing the ß-amino fatty acid starter unit in the biosynthesis of the macrolactam antibiotic cremimycin.

Cremimycin is a 19-membered macrolactam glycoside antibiotic based on three distinctive substructures: 1) a ß-amino fatty acid starter moiety, 2) a bicyclic macrolactam ring, and 3) a cymarose unit. To elucidate the biosynthetic machineries responsible for these three structures, the cremimycin biosynthetic gene cluster was identified. The cmi gene cluster consists of 33 open reading frames encoding eight polyketide synthases, six deoxysugar biosynthetic enzymes, and a characteristic group of five ß-amino-acid-transfer enzymes. Involvement of the gene cluster in cremimycin production was confirmed by a gene knockout experiment. Further, a feeding experiment demonstrated that 3-aminononanoate is a direct precursor of cremimycin. Two characteristic enzymes of the cremimycin-type biosynthesis were functionally characterized in vitro. The results showed that a putative thioesterase homologue, CmiS1, catalyzes the Michael addition of glycine to the ß-position of a non-2-enoic acid thioester, followed by hydrolysis of the thioester to give N-carboxymethyl-3-aminononanoate. Subsequently, the resultant amino acid was oxidized by a putative FAD-dependent glycine oxidase homologue, CmiS2, to produce 3-aminononanoate and glyoxylate. This represents a unique amino transfer mechanism for ß-amino acid biosynthesis.