镉对一种固氮蓝细菌中固氮酶活性及其他酶的调控
Cadmium mediated control of nitrogenase activity and other enzymes in a nitrogen fixing cyanobacterium.
作者信息
Trehan K
机构信息
Department of Botany, Kurukshetra University, India.
出版信息
Acta Microbiol Immunol Hung. 1994;41(4):441-9.
Cadmium decreased the specific growth rate and total cell mass at concentrations > 0.001 micrograms ml-1. It also reduced heterocyst frequency, total cell protein, nitrogenase activity (acetylene reduction) and decreased glutamine synthetase (GS) and glutamate synthase (GOGAT) activities. However, cells grown under low concentration of cadmium (0.001 microgram ml-1) had enhanced nitrogenase as well as GS activity besides showing increased growth rate and heterocyst frequency. Cadmium has apparently controlled nitrogenase activity and nitrogen fixation possibly via mediating enzymes including glutamine synthetase in Nostoc muscorum.
当镉浓度>0.001微克/毫升时，其会降低比生长速率和总细胞质量。它还会降低异形胞频率、总细胞蛋白、固氮酶活性（乙炔还原），并降低谷氨酰胺合成酶（GS）和谷氨酸合酶（GOGAT）的活性。然而，在低镉浓度（0.001微克/毫升）下生长的细胞，除了显示出生长速率和异形胞频率增加外，固氮酶以及GS活性也有所增强。镉显然可能通过介导包括地木耳谷氨酰胺合成酶在内的酶来控制固氮酶活性和固氮作用。
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