The invention discloses a
yeast strain
promoter with weakened regulation intensity and application thereof. The invention specifically discloses
a DNA molecule, and the
DNA molecule is a recombinant
promoter with reduced or weakened regulation intensity obtained by integrating a
heterologous cis-acting regulatory element with a repression effect and a
yeast strain inner source endogenous
promoter. According to the invention, the intensity of the
yeast strain promoter can be effectively reduced by integrating the marO sequence, the
gene expression level is reduced from the transcriptional level, and a new tool is provided for reducing the metabolic flux of a
branch way, a
decomposition way or a derivative way in yeast
metabolic engineering. The metabolic flux from
squalene to
sterol can be effectively reduced by applying the promoter weakening strategy to weakening of a yeast
squalene derivation path. The
yeast strain for producing
squalene, provided by the invention, can realize efficient accumulation of squalene, reduce the
fermentation cost and simplify the
fermentation process under the condition of not adding additional
enzyme inhibitor
terbinafine or other effectors, with a very good industrial application prospect.