文献类型：期刊文献

英文题名：Mechanism Analysis of Effect of Oxygen on Molecular Weight of Hyaluronic Acid Produced by Streptococcus zooepidemicus

作者：Duan, Xu-Jie[1];Niu, Hong-Xing[1];Tan, Wen-Song[1];Zhang, Xu[1]

机构：[1]E China Univ Sci & Technol, State Key Lab Bioreactor Engn, Shanghai 200237, Peoples R China

年份：2009

卷号：19

期号：3

起止页码：299

外文期刊名：JOURNAL OF MICROBIOLOGY AND BIOTECHNOLOGY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000264757500011)】；

语种：英文

外文关键词：Oxygen; hyaluronic acid; metabolic flux analysis; hyaluronic acid synthase; reactive oxygen species

摘要：Dissolved oxygen (DO) has a significant effect on the molecular weight of hyaluronic acid (HA) during the fermentation of Streptococcus zooepidemicus. Therefore, to further investigate the effect of DO on the yield and molecular weight of HA, this study compared the metabolic flux distribution of S. zooepidemicus under aerobic conditions at various DO levels. The metabolic flux analysis demonstrated that the HA synthesis pathway, considered a dependent network, was little affected by the DO level. In contrast, the fluxes of lactate and acetate were greatly influenced, and more ATP was generated concomitant with acetate at a high DO level. Furthermore, the has gene expression and HA synthase activity were both repressed under anaerobic conditions, yet not obviously affected under aerobic conditions at various DO levels. Therefore, it was concluded that the HA molecular weight would seem to depend on the concomitant effect of the generation of ATP and reactive oxygen species. It is expected that this work will contribute to a better understanding of the effect of the DO level on the mechanism of the elongation of HA chains.