枯草芽孢杆菌大纤维中螺旋方向的反转。
Inversion of helix orientation in Bacillus subtilis macrofibers.
作者信息
Mendelson N H, Karamata D
出版信息
J Bacteriol. 1982 Jul;151(1):450-4. doi: 10.1128/jb.151.1.450-454.1982.
Abstract
The ability of helical macrofibers of Bacillus subtilis to convert from left- to right-handed structures or vice versa has been known to be controlled by the nutritional environment (N. H. Mendelson, Proc. Natl. Acad. Sci. U.S.A., 75:2478-2482, 1978). lyt mutants (Ni15, FJ3, FJ6, and FJ7) and also lyt phenocopies of wild-type strain FJ8 were able to undergo helix hand inversion as a function of temperature. The transition between right- and left-handed structures was in a very narrow range (about 2.5 degrees C) in the low to mid-40 degrees C. The helix orientation of these strains was also influenced by the concentration of divalent ions. Macrofiber handedness is governed, therefore, by at least four factors: genetic composition, temperature, and nutritional and ionic environments. Conditions normally used for growth fall, within this matrix, in the region favoring right-handed structures. Inhibition studies suggest that cell growth must occur for helix hand inversion.
摘要
枯草芽孢杆菌的螺旋状大纤维从左旋结构转变为右旋结构或反之亦然的能力已知受营养环境控制（N. H. 门德尔松，《美国国家科学院院刊》，75:2478 - 2482，1978年）。lyt突变体（Ni15、FJ3、FJ6和FJ7）以及野生型菌株FJ8的lyt表型能够随温度发生螺旋手性反转。在40摄氏度低至中温范围内，右旋和左旋结构之间的转变范围非常窄（约2.5摄氏度）。这些菌株的螺旋方向也受二价离子浓度的影响。因此，大纤维的手性至少受四个因素控制：遗传组成、温度以及营养和离子环境。通常用于生长的条件处于这个矩阵中有利于右旋结构的区域。抑制研究表明，螺旋手性反转必须在细胞生长时发生。
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