大肠杆菌SD序列碱基片段的统计分析  

A Statistics on the Bases in SD Regionof Escherichia coli Genes

作　　者：李宏 罗辽复[1] 

机构地区：[1]内蒙古大学理论物理和理论生物学研究室

出　　处：《内蒙古大学学报（自然科学版）》1998年第5期655-659,共5页Journal of Inner Mongolia University：Natural Science Edition

基　　金：国家自然科学基金;内蒙教育厅基金

摘　　要：统计了大肠杆菌基因中构成ＳＤ区域的碱基片段，给出了ＳＤ区域中相对使用频率高的和低的２碱基、３碱基、４碱基和６碱基片断．我们发现，构成ＳＤ序列的碱基片段有很强的偏好性；另外我们还研究了这几类碱基片段与基因表达水平的关系，发现碱基片段出现的相对频率有些与基因表达水平成正比，有些与基因表达水平成反比，还有一些与基因表达水平无关。The base elements (2base,3base,4base and 6base element) in SD sequences of Escherichia coli are analyzed and the base elements which occur with very high or very low relative frequency are listed.We find that these elements in SD region are strongly biased;The relation between the relative frequency of these elements and gene expression level are analyzed.We find that the frequencies of some elements ae proportional to gene expression level and others are inversely proportional to gene expression level.This shows that SD sequences of E.coli correlate with the gene expression.

关 键 词：SD区域 碱基片段 基因表达水平 大肠杆菌 

分 类 号：Q939.121[生物学—微生物学]