# Genomic and Metabolomic Insights into Metabolites of a Streptomyces Isolate Associated with Chromodoris quadricolor, a Red Sea Nudibranch

## TL;DR

This study explores the metabolites produced by a Streptomyces strain from a Red Sea nudibranch, revealing new gene clusters and metabolites that could be useful for biomining.

## Contribution

The study provides new insights into the metabolome and biosynthetic potential of Streptomyces tunisiensis from a marine nudibranch.

## Key findings

- The Streptomyces isolate was identified as Streptomyces tunisiensis with a complete genome analysis.
- 36 predicted biosynthetic gene clusters and 569 detected metabolites were identified, with 86 metabolites confirmed using standards.
- A lassopeptide synthesis gene cluster and multiple siderophores were found in both the genome and metabolic extract.

## Abstract

The marine invertebrate-associated microbiome has garnered significant interest in recent years due to its wealth of novel genes that can be explored for biomining. By combining genomics with untargeted data-dependent mass spectrometry (MS) and molecular networking, we characterized the secreted metabolome of Streptomyces sp. In a previous study, we isolated and characterized a strain of Streptomyces, designated as strain 34, from the nudibranch Chromodoris quadricolor, collected by SCUBA diving in the Red Sea near El Tor in the Gulf of Suez, Egypt. In the present study, the Streptomyces isolate was identified as Streptomyces tunisiensis GCF 039538125 1 (p-value: 0). Genomic and metabolomic analysis reveal 36 predicted biosynthetic gene clusters. A total of 569 metabolites were detected in the culture, with 86 of these being identified based on standards and public spectral libraries. Moreover, a single lassopeptide synthesis gene cluster was found in both the genome and the metabolic extract, along with various sets of siderophores identified in the metabolic extract. Since the metabolic processes of marine invertebrate microbiomes are poorly understood, our findings are a significant addition to the research on metabolism in host microbiomes.