Genomic and gene expression evidence of nonribosomal peptide and polyketide production among ruminal bacteria: a potential role in niche colonization?
Genomic and transcriptomic analyses were performed to investigate nonribosomal peptide synthetases (NRPS) and polyketide synthases (PKS) in 310 genomes of ruminal/fecal microorganisms. A total of 119 biosynthetic genes potentially encoding distinct nonribosomal peptides (NRPs) and polyketides (PKs) were predicted in the ruminal microbial genomes and functional annotation separated these genes into 19 functional categories. The phylogenetic reconstruction of the 16S rRNA sequences coupled to the distribution of the three 'backbone' genes involved in NRPS and PKS biosyntheses suggested that these genes were not acquired through horizontal gene transfer. Metatranscriptomic analyses revealed that the predominant genes involved in the synthesis of NRPs and PKs were more abundant in sheep rumen datasets. Reads mapping to the NRPS and PKS biosynthetic genes were represented in the active ruminal microbial community, with transcripts being highly expressed in the bacterial community attached to perennial ryegrass, and following the main changes occurring between primary and secondary colonization of the forage incubated with ruminal fluid. This study is the first comprehensive characterization demonstrating the rich genetic capacity for NRPS and PKS biosyntheses within rumen bacterial genomes, which highlights the potential functional roles of secondary metabolites in the rumen ecosystem.
['Moreira|Sofia Magalhães|SM|', 'de Oliveira Mendes|Tiago Antônio|TA|', 'Santanta|Mateus Ferreira|MF|', 'Huws|Sharon A|SA|', 'Creevey|Christopher J|CJ|', 'Mantovani|Hilário C|HC|']
D000818:Animals D001419:Bacteria D005243:Feces D000069196:Gastrointestinal Microbiome D020869:Gene Expression Profiling D023281:Genomics D046908:Peptide Biosynthesis, Nucleic Acid-Independent D010453:Peptide Synthases D010802:Phylogeny D048630:Polyketide Synthases D061065:Polyketides D012336:RNA, Ribosomal, 16S D012417:Rumen D012418:Ruminants
nonribosomal peptides polyketides NRPS PKS biosynthetic gene clusters forage colonization rumen microbiome