A eubacterium was isolated from ground phosphate rock in Kunming,the detection results of thin layer chromatography (TLC) showed that the strain crude enzyme liquid could iosmerize maltose heterogeneous into trehalose.Through microscopic observation,the strain was gram-negative bacterium,colourless,rod-shaped,with a flagellum,0.6-0.8 μm in diameter and about 1.4-2.0 μm in length.No accumulation of poly-3-hydroxybutyrate (PHB) granules as inclusion bodies was observed.The optimal growth temperature of the strain was 30 ℃ and the optimal pH was 7.0.The strain was identified as Pseudomonas sp.and named BIE-1 by biological techniques (including 16S rRNA sequence analysis,DNA (G+C) mol％,DNA-DNA hybridization,etc.) and physiological-biochemical characteristic.It increased the species diversity of Pseudomonas sp.,which provided new choice for the trehalose biosynthesis by eubacteria.%由薄层层析法检测试验发现,从昆明磷矿粉中分离出的一株真细菌,其粗酶液能将麦芽糖异构化为海藻糖.通过显微观察发现,该菌株为革兰氏阴性菌,无色、杆状、具有鞭毛;菌体直径大小0.6～0.8 μm,长度约1.4～2.0μm;胞内没有聚-3-羟丁酸(PHB)包含体;最佳生长温度为30℃,最适生长pH为7.0.经16S rRNA序列比对、DNA (G+C) mol％和DNA-DNA杂交等分子生物学技术以及生理生化特性检测后,认定该菌株为假单胞菌属(Pseudomonas sp.)一种,将其命名为BIE-1.该菌株增加了假单胞菌属菌种多样性,为海藻糖生物合成真细菌菌株提供了新的选择.
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