三叶草根瘤菌的多元醇代谢
Polyol metabolism by Rhizobium trifolii.
作者信息
Primrose S B, Ronson C W
出版信息
J Bacteriol. 1980 Mar;141(3):1109-14. doi: 10.1128/jb.141.3.1109-1114.1980.
In Rhizobium trifolii 7000, the polyols myo-inositol, xylitol, ribitol, D-arabitol, D-mannitol, D-sorbital, and dulcitol are metabolized by inducible nicotinamide adenine dinucleotide-dependent polyol dehydrogenases. Five different polyol dehydrogenases were recognized: inositol dehydrogenase, specific for inositil; ribitol dehydrogenase, specific for ribitol; D-arabitol dehydrogenase, which oxidized D-arabitol, D-mannitol, and D-sorbitol; xylitol dehydrogenase, which oxidized xylitol and D-sorbitol; and dulcitol dehydrogenase, which oxidized dulcitol, ribitol, xylitol, and sorbitol. Apart from inositil and xylitol, all of the polyols induced more than one polyol dehydrogenase and polyol transport system, but the heterologous polyol dehydrogenases and polyol transport systems were not coordinately induced by a particular polyol. With the exception of xylitol, all of the polyols tested served as growth substrates. A mutant of trifolii 7000, which was constitutive for dulcitol dehydrogenase, could also grow on xylitol.
在三叶草根瘤菌7000中，多元醇如肌醇、木糖醇、核糖醇、D-阿拉伯糖醇、D-甘露醇、D-山梨醇和卫矛醇可被诱导型烟酰胺腺嘌呤二核苷酸依赖性多元醇脱氢酶代谢。识别出了五种不同的多元醇脱氢酶：对肌醇具有特异性的肌醇脱氢酶；对核糖醇具有特异性的核糖醇脱氢酶；氧化D-阿拉伯糖醇、D-甘露醇和D-山梨醇的D-阿拉伯糖醇脱氢酶；氧化木糖醇和D-山梨醇的木糖醇脱氢酶；以及氧化卫矛醇、核糖醇、木糖醇和山梨醇的卫矛醇脱氢酶。除肌醇和木糖醇外，所有多元醇均诱导产生一种以上的多元醇脱氢酶和多元醇转运系统，但特定多元醇不会协同诱导异源多元醇脱氢酶和多元醇转运系统。除木糖醇外，所有测试的多元醇都可作为生长底物。一种对卫矛醇脱氢酶呈组成型的三叶草根瘤菌7000突变体也能在木糖醇上生长。
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