Abstract
Non-ribosomal peptide synthetases (NRPSs) and polyketide synthases (PKSs) present in bacteria and fungi are the major multi-modular enzyme complexes which synthesize secondary metabolites like the pharmacologically important antibiotics and siderophores. Each of the multiple modules of an NRPS activates a different amino or aryl acid, followed by their condensation to synthesize a linear or cyclic natural product. The studies on NRPS domains, the knowledge of their gene cluster architecture and tailoring enzymes have helped in the in silico genetic screening of the ever-expanding sequenced microbial genomic data for the identification of novel NRPS/PKS clusters and thus deciphering novel non-ribosomal peptides (NRPs). Adenylation domain is an integral part of the NRPSs and is the substrate selecting unit for the final assembled NRP. In some cases, it also requires a small protein, the MbtH homolog, for its optimum activity. The presence of putative adenylation domain and MbtH homologs in a sequenced genome can help identify the novel secondary metabolite producers. The role of the adenylation domain in the NRPS gene clusters and its characterization as a tool for the discovery of novel cryptic NRPS gene clusters are discussed.
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Acknowledgements
MS acknowledges the independent Senior Research Fellowship (SRF) No. 3/1/3/JRF-2011/HRD-99(11005), awarded by the Indian Council of Medical Research, New Delhi. The financial assistance received from DST-PURSE grant, Department of Science and Technology, and UGC-SAP, New Delhi, are also acknowledged.
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[Singh M, Chaudhary S and Sareen D 2017 Non-ribosomal peptide synthetases: Identifying the cryptic gene clusters and decoding the natural product. J. Biosci.]
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Singh, M., Chaudhary, S. & Sareen, D. Non-ribosomal peptide synthetases: Identifying the cryptic gene clusters and decoding the natural product. J Biosci 42, 175–187 (2017). https://doi.org/10.1007/s12038-017-9663-z
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DOI: https://doi.org/10.1007/s12038-017-9663-z