The gene dosage effect of carbonic anhydrase on the biosynthesis of poly(3-hydroxybutyrate) under autotrophic and mixotrophic culture conditions

The gene dosage effect of carbonic anhydrase on the biosynthesis of poly(3-hydroxybutyrate) under autotrophic and mixotrophic culture conditions
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自养和混合营养培养条件下碳酸酐酶基因剂量对聚(3-羟基丁酸酯)生物合成的影响

DOI:
10.1038/s41428-020-00409-3
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发表时间:
2021
期刊:
影响因子:
2.8
通讯作者:
Takeharu Tsuge.
Takeharu Tsuge.
中科院分区:
化学3区
文献类型:
--
作者:
Romeo Thorbecke;Masahiro Yamamoto;Yuki Miyahara;Mino Oota;Shoji Mizuno;Takeharu Tsuge.

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富养罗尔斯顿菌是一种氢氧化化能营养细菌,可以合成聚[(R)-3-羟基丁酸酯][P(3HB)],用作可生物降解塑料。 R基因组中存在编码参与CO2固定和代谢的碳酸酐酶(CA)的各种基因。富养藻。尽管CA对于R中CO2代谢的重要性。众所周知,对于富营养化藻,CA 从未被有意用于提高 CO2 中 P(3HB) 的产量。因此,我们研究了β-碳酸酐酶(can)基因对R中P(3HB)积累的基因剂量效应。自养和混合营养条件下的 eutropicaH16。基于多拷贝质粒的癌基因剂量显示,在氮源有限的自养条件下生长的细胞中 P(3HB) 含量增加了 1.5 倍。在甘油存在的氮源限制混合营养条件下观察到类似的结果。因此,这些发现提出了在自养和混合营养培养条件下增加 P(3HB) 产量的可行策略。
Ralstonia eutrophais a hydrogen-oxidizing chemolithotrophic bacterium that can synthesize poly[(R)-3-hydroxybutyrate] [P(3HB)], which is used as a biodegradable plastic. Various genes coding for carbonic anhydrase (CA), which are involved in CO2fixation and metabolism, are present in the genome ofR. eutropha. Although the significance of CA for CO2metabolism inR. eutrophais well known, CAs have never been deliberately employed to enhance P(3HB) production from CO2. Thus, we investigated the gene dosage effect of the β-carbonic anhydrase (can) gene on P(3HB) accumulation inR. eutrophaH16 under autotrophic and mixotrophic conditions. The multicopy plasmid-based dosage of thecangene showed a 1.5-fold increase in P(3HB) content in cells grown under nitrogen-source-limited autotrophic conditions. A similar result was observed under nitrogen-source-limited mixotrophic conditions in the presence of glycerol. Thus, these findings suggest a viable strategy to increase P(3HB) yield under autotrophic and mixotrophic culture conditions.
DOI: 10.1016/j.jbiosc.2018.05.026
发表时间: 2018-12-01
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DOI: --
发表时间: 2015
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