Dance G S, Sowden M P, Yang Y, Smith H C
Department of Biochemistry, University of Rochester, NY 14642, USA.
Nucleic Acids Res. 2000 Jan 15;28(2):424-9. doi: 10.1093/nar/28.2.424.
Cytidine to uridine editing of apolipoprotein B (apoB) mRNA requires the cytidine deaminase APOBEC-1 as well as a tripartite sequence motif flanking a target cytidine in apoB mRNA and an undefined number of auxiliary proteins that mediate RNA recognition and determine site-specific editing. Yeast engineered to express APOBEC-1 and apoB mRNA supported editing under conditions of late log phase growth and stationary phase. The cis -acting sequence requirements and the intracellular distribution of APOBEC-1 in yeast were similar to those described in mammalian cells. These findings suggest that auxiliary protein functions necessary for the assembly of editing complexes, or 'editosomes', are expressed in yeast and that the distribution of editing activity is to the cell nucleus.
载脂蛋白B(apoB)信使核糖核酸(mRNA)中胞苷向尿苷的编辑需要胞苷脱氨酶APOBEC-1、apoB mRNA中靶胞苷侧翼的三方序列基序以及数量不确定的辅助蛋白,这些辅助蛋白介导RNA识别并决定位点特异性编辑。经工程改造以表达APOBEC-1和apoB mRNA的酵母在对数生长期后期和稳定期条件下支持编辑。酵母中APOBEC-1的顺式作用序列要求和细胞内分布与哺乳动物细胞中描述的相似。这些发现表明,编辑复合体或“编辑体”组装所必需的辅助蛋白功能在酵母中表达,且编辑活性分布于细胞核。