Discovery of Streptomyces species CS-62, a novel producer of the Acinetobacter baumannii selective antibiotic factumycin

Author:

Alwali Amir Y12,Santos Diane12,Aguilar César12ORCID,Birch Audrey12,Rodriguez-Orduña Lorena3ORCID,Roberts Carson B12,Modi Ramya12,Licona-Cassani Cuauhtemoc3,Parkinson Elizabeth I45ORCID

Affiliation:

1. D , West Lafayette, IN 47907,   USA

2. epartment of Chemistry, Purdue University , West Lafayette, IN 47907,   USA

3. Centro de Biotecnología FEMSA, Tecnológico de Monterrey, Escuela de Ingeniería y Ciencias , 64849 Monterrey , México

4. Department of Chemistry, Purdue University , West Lafayette, IN 47907,   USA

5. Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University , West Lafayette, IN 47907,   USA

Abstract

Abstract Narrow-spectrum antibiotics are of great interest given their ability to spare the microbiome and decrease widespread antibiotic resistance compared to broad-spectrum antibiotics. Herein, we screened an in-house library of Actinobacteria strains for selective activity against Acinetobacter baumannii and successfully identified Streptomyces sp. CS-62 as a producer of a natural product with this valuable activity. Analysis of the cultures via high-resolution mass spectrometry and tandem mass spectrometry, followed by comparison with molecules in the Natural Product Atlas and the Global Natural Products Social Molecular Networking platform, suggested a novel natural product. Genome mining analysis initially supported the production of a novel kirromycin derivative. Isolation and structure elucidation via mass spectrometry and Nuclear Magnetic Resonance (NMR) analyses revealed that the active natural product was the known natural product factumycin, exposing omissions and errors in the consulted databases. While public databases are generally very useful for avoiding rediscovery of known molecules, rediscovery remains a problem due to public databases either being incomplete or having errors that result in failed dereplication. Overall, the work describes the ongoing problem of dereplication and the continued need for public database curation.

Funder

National Institutes of Health

Publisher

Oxford University Press (OUP)

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