在本研究中,我们首次通过基因组上游第一次步移克隆到了雨生红球藻中crtO基因的3个不同大小的5’上游侧翼序列1.1kb,1.9kb和2.2kb。利用生物信息学方法分别预测并比较了这3个不同大小的5’上游侧翼序列,结果发现,三者具有与高等植物相类似的顺式作用元件,如脱落酸反应元件(ABRE)、干燥或低温反应元件(DRE/C-repeat)、几种光反应元件(G1-box,GAG-motif,l-boxand ATC—motif)、热激反应元件(HSE)、机械伤害反应元件(WUN-motif)、生长素反应元件(TGA-element)、茉莉酸甲酯反应元件(TGACG-element)和反式作用因子MYB蛋白的结合位点(MBSandMRE)等等,但是三者并不具有典型的TATA框和CCAAT框。上述研究预示了雨生红球藻虾青素合成中crtO基因调控方式的多样化。
Three separate 5'-flanking regions (1.1 kb, 1.9 kb and 2.2 kb) of crtO were cloned through walking upstream. Results of sequence analysis show that three 5'-flanking regions of crtO might have some similar putative cis-acting elements such as ABA (abscisic acid)-responsive element (ABRE), C-repeat/dehydration responsive element (C-repeat/DRE), light-responsive element (G-box, GAG-motif, I-box and ATC-motif), wound-responsive element (WUN-motif), auxin-responsive element (TGA-element), MeJA-responsive element (TGACG-element) and MYB binding site (MBS), except for typical TATA box or CCAAT box. These findings might mean diversiform regulatory patterns of crtO being in astaxanthin biosynthesis of Haematococcus pluvialis.