Degradation of pyridine by one Rhodococcus strain in the presence of chromium (VI) or phenol.
Degradation of pyridine by one Rhodococcus strain in the presence of chromium (VI) or phenol.
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DOI：
10.1016/j.jhazmat.2011.04.034
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发表时间：
2011-07
影响因子：
13.6
通讯作者：
Ji-Quan Sun;Lian Xu;Yue-qin Tang;Fu‐ming Chen;Wei-Qiang Liu;Xiao‐Lei Wu
中科院分区：
文献类型：
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作者：
Ji-Quan Sun;Lian Xu;Yue-qin Tang;Fu‐ming Chen;Wei-Qiang Liu;Xiao‐Lei Wu
分离到一株能降解吡啶和苯酚，并能还原六价铬(Cr(VI))的弧菌Chr-9。该菌能以吡啶为唯一碳源和氮源生长，对L−1苯酚的降解能力提高100g/L，而对L−1的苯酚浓度大于400mg时，对吡啶的降解受到抑制。吡啶的羟化作用提示苯酚对吡啶降解的刺激和抑制可能归因于苯酚和吡啶对羟基酶基因的竞争。以葡萄糖和LB为碳源时，菌株Chr-9也能还原六价铬，但以吡啶为唯一碳源和能源时，不能还原六价铬。此外，在葡萄糖存在下，菌株Chr-9在还原六价铬的同时也能降解吡啶。据我们所知，菌株Chr-9是第一个被报道在铬(VI)存在下降解吡啶的红球菌菌株，也是第一个被低浓度苯酚刺激降解吡啶的菌株。
ARhodococcusstrain, Chr-9, which has the ability to degrade pyridine and phenol and reduce chromium (VI) (Cr (VI)) was isolated. The strain could grow with pyridine as the sole carbon and nitrogen source, and its pyridine-degradation capability was enhanced by 100 mg l−1phenol; however, the degradation of pyridine was inhibited when the phenol concentration was greater than 400 mg l−1. The hydroxylation of pyridine suggested that the stimulation and inhibition of phenol to the pyridine degradation may be attributed to competition of phenol and pyridine for the hydroxylase gene. Strain Chr-9 was also able to reduce Cr (VI) when glucose and LB was used as the carbon source; however, the Cr (VI) reduction did not occur when pyridine was the sole carbon and energy source. In addition, strain Chr-9 could reduce Cr (VI) and simultaneously degrade pyridine in the presence of glucose. To the best of our knowledge, strain Chr-9 is the firstRhodococcusstrain reported to degrade pyridine in the presence of Cr (VI), and the first strain with the pyridine degradation being stimulated by low concentrations of phenol.