大肠杆菌K-12乳糖区域的倒位
Inversion in the lactose region of Escherichia coli K-12.
作者信息
Savic D J
出版信息
J Bacteriol. 1979 Nov;140(2):311-9. doi: 10.1128/jb.140.2.311-319.1979.
Abstract
A spontaneous mutant of Escherichia coli K-12, strain SY99, with an inversion in the lactose region was isolated and partially characterized. The inversion was detected due to inverse chromosomal conjugational transfer after introduction of an F42 (F'lac) episome. The termini of the inversion are between proAB and lac on one side and lac and proC on the other. The inverse conjugational transfer in SY99 did not appear to be absolute but was always accompanied by a residual "normal" counterclockwise mobilization. This residual transfer was further shown to be caused by the intrinsic instability of this region (at least in the line W3110). The possible involvement of IS3 elements flanking the lactose operon is discussed.
摘要
分离出了大肠杆菌K-12的自发突变株SY99，其乳糖区域存在倒位，并对其进行了部分特征分析。在引入F42（F'lac）附加体后，通过反向染色体接合转移检测到了这种倒位。倒位的末端一侧在proAB和lac之间，另一侧在lac和proC之间。SY99中的反向接合转移似乎不是绝对的，而是总是伴随着残留的“正常”逆时针移动。进一步证明这种残留转移是由该区域的内在不稳定性引起的（至少在W3110品系中）。讨论了乳糖操纵子两侧IS3元件可能的参与情况。
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