Analysis of the genomic sequences and metabolites of Serratia surfactantfaciens sp. nov. YD25Tthat simultaneously produces prodigiosin and serrawettin W2.
Gram-negative bacteria of the genus Serratia are potential producers of many useful secondary metabolites, such as prodigiosin and serrawettins, which have potential applications in environmental bioremediation or in the pharmaceutical industry. Several Serratia strains produce prodigiosin and serrawettin W1 as the main bioactive compounds, and the biosynthetic pathways are co-regulated by quorum sensing (QS). In contrast, the Serratia strain, which can simultaneously produce prodigiosin and serrawettin W2, has not been reported. This study focused on analyzing the genomic sequence of Serratia sp. strain YD25Tisolated from rhizosphere soil under continuously planted burley tobacco collected from Yongding, Fujian province, China, which is unique in producing both prodigiosin and serrawettin W2.



A hybrid polyketide synthases (PKS)-non-ribosomal peptide synthetases (NRPS) gene cluster putatively involved in biosynthesis of antimicrobial serrawettin W2 was identified in the genome of YD25T, and its biosynthesis pathway was proposed. We found potent antimicrobial activity of serrawettin W2 purified from YD25Tagainst various pathogenic bacteria and fungi as well as antitumor activity against Hela cells. Subsequently, comparative genomic analyses were performed among a total of 133 Serratia species. The prodigiosin biosynthesis gene cluster in YD25Tbelongs to the type I pig cluster, which is the main form of pig-encoding genes existing in most of the pigmented Serratia species. In addition, a complete autoinducer-2 (AI-2) system (including luxS, lsrBACDEF, lsrGK, and lsrR) as a conserved bacterial operator is found in the genome of Serratia sp. strain YD25T. Phylogenetic analysis based on concatenated Lsr and LuxS proteins revealed that YD25Tformed an independent branch and was clearly distant from the strains that solely produce either prodigiosin or serrawettin W2. The Fe (III) ion reduction assay confirmed that strain YD25Tcould produce an AI-2 signal molecule. Phylogenetic analysis using the genomic sequence of YD25Tcombined with phylogenetic and phenotypic analyses support this strain as a member of a novel and previously uncharacterized Serratia species.



Genomic sequence and metabolite analysis of Serratia surfactantfaciens YD25Tindicate that this strain can be further explored for the production of useful metabolites. Unveiling the genomic sequence of S. surfactantfaciens YD25Tbenefits the usage of this unique strain as a model system for studying the biosynthesis regulation of both prodigiosin and serrawettin W2 by the QS system.
College of Life Sciences, Shaanxi Normal University, Xi'an, 710119, People's Republic of China.
Chun
C
Su
College of Life Sciences, Shaanxi Normal University, Xi'an, 710119, People's Republic of China.
Zhaoju
Z
Xiang
College of Life Sciences, Shaanxi Normal University, Xi'an, 710119, People's Republic of China.
Yibo
Y
Liu
School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, 200000, China.
Xinqing
X
Zhao
College of Life Sciences, Shaanxi Normal University, Xi'an, 710119, People's Republic of China. sunyan@snnu.edu.cn.
Yan
Y
Sun
College of Life Sciences, Shaanxi Normal University, Xi'an, 710119, People's Republic of China. lizhi@snnu.edu.cn.
Zhi
Z
Li
College of Food and Biological Engineering, Jimei University, Xiamen, 361000, China.
Lijun
L
Li
College of Life Sciences, Shaanxi Normal University, Xi'an, 710119, People's Republic of China.
Fan
F
Chang
College of Life Sciences, Shaanxi Normal University, Xi'an, 710119, People's Republic of China.
Tianjun
T
Chen
College of Life Sciences, Shaanxi Normal University, Xi'an, 710119, People's Republic of China.
Xinrong
X
Wen
College of Life Sciences, Shaanxi Normal University, Xi'an, 710119, People's Republic of China.
Yidan
Y
Zhou
College of Life Sciences, Shaanxi Normal University, Xi'an, 710119, People's Republic of China.
Furong
F
Zhao
D000900:Anti-Bacterial Agents / Q000096:biosynthesis / Q000494:pharmacology; D019295:Computational Biology / Q000379:methods; D057225:Data Mining; D005227:Fatty Acids / Q000378:metabolism; D016680:Genome, Bacterial; D023281:Genomics / Q000379:methods; D008074:Lipoproteins / Q000096:biosynthesis* / Q000235:genetics / Q000494:pharmacology; D055442:Metabolome; D055432:Metabolomics / Q000379:methods; D005810:Multigene Family; D010456:Peptides, Cyclic / Q000096:biosynthesis* / Q000235:genetics / Q000494:pharmacology; D010641:Phenotype; D010802:Phylogeny; D011353:Prodigiosin / Q000096:biosynthesis* / Q000494:pharmacology; D053038:Quorum Sensing / Q000235:genetics; D012705:Serratia / Q000145:classification / Q000235:genetics* / Q000378:metabolism*
D000900:Anti-Bacterial Agents; D005227:Fatty Acids; D008074:Lipoproteins; D010456:Peptides, Cyclic; C073497:serrawettin W2; D011353:Prodigiosin
Antimicrobial activity; Genome comparisons; Non-ribosomal peptide synthetases; Polyphasic taxonomy; Quorum sensing; Serratia; Serrawettin W2