Lucchini G, Hinnebusch A G, Chen C, Fink G R
Mol Cell Biol. 1984 Jul;4(7):1326-33. doi: 10.1128/mcb.4.7.1326-1333.1984.
The role of cis- and trans-acting elements in the expression of HIS4 has been examined by using HIS4-lacZ fusions in which lacZ expression is dependent upon the HIS4 5' noncoding region. The cis-acting sequences involved in regulation were defined by studying the effects of the wild-type and various deletions and their revertants on regulation via the general control of amino acid biosynthesis. The role of trans-acting genes was analyzed by studying the regulation of the HIS4-lacZ fusions in strains carrying mutations in the GCN (AAS) or GCD (TRA) genes and in strains carrying the GCN genes on high-copy-number plasmids. These studies have led to the following conclusions. (i) HIS4 is positively regulated by the general control. (ii) At least one copy of the 5'TGACTC3' repeat at -136 is required in cis for this regulation. (iii) Both the GCN4 gene and at least one copy of the repeated sequence are required for expression at the repressed level. (iv) The open reading frames in the 5' noncoding region are not required in either cis or trans for the regulation of HIS4.
通过使用HIS4-lacZ融合体来研究顺式和反式作用元件在HIS4表达中的作用,其中lacZ的表达依赖于HIS4的5'非编码区。通过研究野生型、各种缺失及其回复突变体对氨基酸生物合成的一般控制的调节作用,确定了参与调节的顺式作用序列。通过研究携带GCN(AAS)或GCD(TRA)基因突变的菌株以及携带高拷贝数质粒上GCN基因的菌株中HIS4-lacZ融合体的调节情况,分析了反式作用基因的作用。这些研究得出了以下结论。(i)HIS4受到一般控制的正向调节。(ii)对于这种调节,顺式作用需要在-136处至少有一个5'TGACTC3'重复序列拷贝。(iii)GCN4基因和至少一个重复序列拷贝是在抑制水平表达所必需的。(iv)5'非编码区的开放阅读框在HIS4的调节中无论是顺式还是反式作用都不是必需的。