产胞外多糖干酪乳杆菌的筛选鉴定及galU基因克隆与分析

Journal of Chinese Institute of Food Science and Technology(2014)

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Abstract
乳酸菌胞外多糖具有良好的功能特性.从泡菜中分离乳酸菌,初筛到11株产胞外多糖的乳酸菌.经黏度及EPS产量测定,复筛出1株高产EPS的乳酸菌,其产量为771.97μg/mL.采用CTAB法提取该菌株基因组,测定其16S rRNA序列,在NCBI上进行同源序列比对,建立系统发育树.结果初步确定该菌株为干酪乳杆菌ZJ-4(Lactobacillus casei ZJ-4).以该菌株基因组为模板,参照干酪乳杆菌BL23 (HM162415)的galU序列设计引物.采用Touch-down PCR扩增得到大约900 bp的galU序列,经TA克隆、测序,与干酪乳杆菌BL23(HM162415)的galU序列同源率为98%,表明克隆正确.
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