CCAAT box

W box , X box , Y box and TATA-like box were polymorphic , CCAAT box was conserved . Polymorphic sites also existed between the regulatory elements .

其中WBOX、Xbox、YBOX及类TATABox是多态的，CCAATbox是保守的，在这些调控元件之间也存在多态座位。

HAP , a kind of important transcription factor , occurs in yeasts , mammals and plants . It can bind to the CCAAT box and regulate the expression of target genes .

HAP是与CCAAT框结合的非常重要的一类转录因子，控制基因的表达，并广泛分布于酵母、哺乳动物、植物细胞中。

Regulatory elements W box , X box , Y box , CCAAT box and TATA-like box which were associated with the expression of structural gene were found in all the URR sequences .

这些序列中均存在与基因表达调控有关的WBOX、Xbox、YBOX、CCAATbox以及类TATABox调控元件，且遵循严格的空间顺序。

To functionally determine the importance of these elements , site-directed mutagenesis was performed and three mutants were constructed respectively , containing a single mutated CCAAT box , a single mutated TCCC box and their double mutant .

为了探讨这些转录元件的生物学功能，本研究利用定点突变技术构建了3个突变体，分别为CCAATbox单突变、TCCCbox单突变和二者的双突变。