An improved Nicotiana benthamiana bioproduction chassis provides novel insights into nicotine biosynthesis
An improved Nicotiana benthamiana bioproduction chassis provides novel insights into nicotine biosynthesis
复制标题
改进的本塞姆氏烟草生物生产底盘为尼古丁生物合成提供了新的见解
DOI:
10.1101/2023.03.06.531326
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发表时间:
2023
期刊:
影响因子:
--
通讯作者:
Vollheyde K
中科院分区:
文献类型:
--
作者:
Vollheyde K
The model plantNicotiana benthamianais an increasingly attractive organism for the production of high‐value, biologically active molecules. However,N. benthamianaaccumulates high levels of pyridine alkaloids, in particular nicotine, which complicates the downstream purification processes.Here, we report a new assembly of theN. benthamianagenome as well as the generation of low‐nicotine lines by CRISPR/Cas9‐based inactivation of berberine bridge enzyme‐like proteins (BBLs). Triple as well as quintuple mutants accumulated three to four times less nicotine than the respective control lines.The availability of lines without functional BBLs allowed us to probe their catalytic role in nicotine biosynthesis, which has remained obscure. Notably, chiral analysis revealed that the enantiomeric purity of nicotine was fully lost in the quintuple mutants. In addition, precursor feeding experiments showed that these mutants cannot facilitate the specific loss of C6 hydrogen that characterizes natural nicotine biosynthesis.Our work delivers an improvedN. benthamianachassis for bioproduction and uncovers the crucial role of BBLs in the stereoselectivity of nicotine biosynthesis.
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