基因组分析揭示拟茎点霉XP-8产松脂醇及其糖苷等多种次级代谢产物的合成途径

Genomic analysis reveals the biosynthesis pathways of diverse secondary metabolites and pinoresinol and its glycoside derivatives in Phomopsis sp.XP-8

摘要:

[目的]通过解析拟茎点霉属XP-8的基因组序列信息，揭示该菌株潜在的代谢途径，并分析松脂醇及其糖苷化合物等次级代谢产物生物合成相关的关键基因。[方法]使用Illumina HiSeq 2500高通量测序平台对拟茎点霉XP-8菌株进行全基因组测序，并通过不同软件对测序数据进行序列拼接，基因预测与功能注释。[结果]组装后的拟茎点霉XP-8基因组大小为55.2 Mb，GC含量53.5%，含有17094个蛋白编码基因和310个非编码基因。获得了松脂醇及其糖苷化合物等次级代谢产物生物合成相关的基因。系统发育分析揭示出拟茎点霉XP-8与5种子囊菌共有12635个同源基因和5626个基因家族。[结论]拟茎点霉XP-8具有用于合成松脂醇及其糖苷化合物等多种次级代谢物的基因组基础，为下一步的代谢工程改造提供依据。

关键词:拟茎点霉;内生真菌;次级代谢产物;木脂素;Illumina测序

Abstract:

[Objective] Sequencing and analysis of Phomopsis sp. XP-8 genome are beneficial to reveal the potential metabolic pathways of this strain and the key genes related to the biosynthesis of pinoresinol and its glycoside derivatives and other secondary metabolites. [Methods] We sequenced Phomopsis sp. XP-8 genome by the Illumina HiSeq 2500 high throughput sequencing platform. Then gene prediction and functional annotation were analyzed using different softwares. [Results] The final assembled genome size was approximately 55.2 Mb with an overall GC content of 53.5%. Further annotation analyses predicted 17094 protein-coding genes and 310 non-coding RNA genes. A large set of candidate genes involved in the production of pinoresinol, its glycoside derivatives and other secondary metabolites were identified. Orthology and phylogenetic analysis revealed that Phomopsis sp. XP-8 and 5 Ascomycota share 12635 orthologous genes and 5626 gene families. [Conclusion] Phomopsis sp. XP-8 possessed genomic basis for production of diverse secondary metabolites, including pinoresinol and its glycoside derivatives. This study provides basis for the further metabolic engineering of pinoresinol and its glucoside production.

Key words:Phomopsis sp.;endophytic fungi;secondary metabolites;lignan;Illumina sequencing