Its putative promoter region was highly homologous to B-dependent promoter of B. subtilis. A 2.6 kb fragment including the betH gene was subcloned into pUC18 and transformed into the E.

• 将包括整个betH基因ORF框及可能的启动子核苷酸序列在内的2.；6kb的片段克隆到pUC18载体上，转入到大肠杆菌甘氨酸甜菜碱缺失株MKH13中，使该菌株能够在含甘氨酸甜菜碱的高盐M9培养基上生长，而对照实验不能生长。