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MbtH-like proteins (MLPs) are required for soluble expression and/or optimal activity of some adenylation (A) domains of nonribosomal peptide synthetases. Because A domains can interact with noncognate MLP partners, how the function of an A domain, TioK, involved in the biosynthesis of the bisintercalator thiocoraline, is altered by noncognate MLPs has been investigated. Measuring TioK activity with 12 different MLPs from a variety of bacterial species by using a radiometric assay suggested that the A domain substrate promiscuity could be altered by foreign MLPs. Kinetic studies and bioinformatics analysis expanded the complexity of MLP functions and interactions.
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http://dx.doi.org/10.1002/cbic.201800240 | DOI Listing |
Int J Mol Sci
February 2025
State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic & Developmental Sciences, School of Life Sciences & Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China.
Nonribosomal peptide synthetases (NRPS) are essential for the biosynthesis of therapeutically valuable molecules, including antibiotics, immunosuppressants, and anticancer agents. The assembly-line mechanism of NRPS offers significant potential for engineering novel natural products through reprogramming. However, the challenging purification of NRPS proteins has impeded the investigation of their assembly and catalytic mechanisms.
View Article and Find Full Text PDFCommun Chem
January 2025
Graduate School of Engineering, Hokkaido University, N13-W8, Kita-ku, Sapporo, Hokkaido, 060-8628, Japan.
Lactacystin is an irreversible proteasome inhibitor isolated from Streptomyces lactacystinicus. Despite its importance for its biological activity, the biosynthesis of lactacystin remains unknown. In this study, we identified the lactacystin biosynthetic gene cluster by gene disruption and heterologous expression experiments.
View Article and Find Full Text PDFFront Microbiol
October 2020
Department of Biology, Memorial University of Newfoundland, St. John's, NL, Canada.
Thaxtomin A is a potent phytotoxin that serves as the principle pathogenicity determinant of the common scab pathogen, , and is also a promising natural herbicide for agricultural applications. The biosynthesis of thaxtomin A involves the non-ribosomal peptide synthetases (NRPSs) TxtA and TxtB, and an MbtH-like protein (MLP), TxtH, which may function as a chaperone by promoting the proper folding of the two NRPS enzymes in . MLPs are required for the proper function of many NRPS enzymes in bacteria, and they are often capable of interacting with NRPSs from different biosynthetic pathways, though the mechanism by which this occurs is still poorly understood.
View Article and Find Full Text PDFChembiochem
September 2020
Department of Pharmaceutical Biology and Biotechnology, University of Freiburg, Stefan-Meier-Strass 19, 79104, Freiburg im Breisgau, Germany.
Nonribosomal peptide synthetases (NRPS) are organized in a modular arrangement. Usually, the modular order corresponds to the assembly of the amino acids in the respective peptide, following the collinearity rule. The WS9326A biosynthetic gene cluster from Streptomyces calvus shows deviations from this rule.
View Article and Find Full Text PDFACS Synth Biol
August 2019
Molecular Microbiology, Groningen Biomolecular Sciences and Biotechnology Institute , University of Groningen, 9747 AG Groningen , The Netherlands.
Filamentous fungi are known producers of bioactive natural products, low molecular weight molecules that arise from secondary metabolism. MbtH-like proteins (MLPs) are small (∼10 kDa) proteins, which associate noncovalently with adenylation domains of some bacterial nonribosomal peptide synthetases (NRPS). MLPs promote the folding, stability, and activity of NRPS enzymes.
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