通过对我国名贵中药冬虫夏草的学名及冬虫夏草菌的分类学进展研究,发现冬虫夏草药材拉丁名、冬虫夏草菌学名以及药材拉丁名需要进一步完善与更新。建议冬虫夏草菌Cordyceps sinensis(Berk.)Sacc.学名修订为Ophiocordyceps sinensis(Berk.)G.H.Sung et al.与国际学术界一致,药材拉丁名应结合虫体信息重新命名Ophiocordyceps&Hepialidae,进一步反映菌虫复合体的特殊性。
Cordycepin was the first adenosine analogue used as an anticancer and antiviral agent, which is extracted from Cordyceps militaris and hasn’t been biosynthesized until now. This study was first conducted to verify the role of ribonucleotide reductases(RNRs, the two RNR subunits, RNRL and RNRM) in the biosynthesis of cordycepin by over expressing RNRs genes in transformed C. militaris. Quantitative real-time PCR(qRT-PCR) and western blotting results showed that the m RNA and protein levels of RNR subunit genes were significantly upregulated in transformant C. militaris strains compared to the control strain. The results of the HPLC assay indicated that the cordycepin was significantly higher in the C. militaris transformants carrying RNRM than in the wildtype strain, whereas the RNRML was preferentially downregulated. For the C. militaris transformant carrying RNRL, the content of cordycepin wasn’t remarkably changed. Furthermore, we revealed that inhibiting RNRs with Triapine(3-AP) almost abrogated the upregulation of cordycepin. Therefore, our results suggested that RNRM can probably directly participate in cordycepin biosynthesis by hydrolyzing adenosine, which is useful for improving cordycepin synthesis and helps to satisfy the commercial demand of cordycepin in the field of medicine.
