Discovery of Three 22-Membered Macrolides by Deciphering the Streamlined Genome of Mangrove-Derived Streptomyces sp. HM190

Frontiers in Microbiology
Yanghui YeMin Wu

Abstract

Strain HM190, a moderate halophile, was isolated from rhizosphere soil of the mangrove Kandelia obovata in Fugong village, China. The 16S ribosomal RNA (rRNA) gene sequence and the results of phylogenetic analysis revealed that strain HM190 belonged to the genus Streptomyces and had the highest sequence similarity of 99.79% to Streptomyces heilongjiangensis NEAU-W2T. The complete genome of strain HM190 comprised 7,762,826 bp in a linear chromosome with 71.97% G + C content. According to antiSMASH analysis, a total of 30 biosynthetic gene clusters (BGCs) were predicted to be involved in secondary metabolism, 12 of which were responsible for the production of polyketide- and non-ribosomal peptide-derived secondary metabolites. Gene cluster 5 was responsible for macrolide biosynthesis in a strain-specific 126,331-bp genomic island belonging to the left-arm region. Combined genomics-metabolomics analysis led to the discovery of three 22-membered macrolides (compounds 1-3). Their structures were elucidated by using spectroscopic techniques including high-resolution electrospray ionization mass spectroscopy (HRESIMS) and nuclear magnetic resonance (NMR). The absolute configurations of compounds 1-3 were determined by the X-ray single...Continue Reading

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Datasets Mentioned

BETA
MN897722
CP047318
JF819834
HM190

Methods Mentioned

BETA
PCR
electrophoresis
X-ray
nuclear magnetic resonance
NMR

Software Mentioned

MEGA
glimmer
SOAPsnp
Subsystem Technology ( RAST )
Olex2
SOAPindel
EzTaxon
ShelXT
BLASTN
Clustal W

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