The glucose kinase of Bacillus subtilis

被引:53
作者
Skarlatos, P [1 ]
Dahl, MK [1 ]
机构
[1] FAU Erlangen Nurnberg, Lehrstuhl Mikrobiol, Inst Mikrobiol Biochem & Genet, D-91058 Erlangen, Germany
关键词
D O I
10.1128/JB.180.12.3222-3226.1998
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
The open reading frame yqgR (now termed glcK), which had been sequenced as part of the genome project, encodes a glucose kinase of Bacillus subtilis. a 1.1-kb DNA fragment containing glcK complemented an Escherichia coli strain deficient in glucose kinase activity. Insertional mutagenesis of glcK resulted in a complete inactivation of glucose kinase activity in crude protein extracts, indicating that B. subtilis contains one major glucose kinase. The glcK gene encodes a 321-residue protein with a molecular mass of 33.5 kDa. The glucose kinase was overexpressed as a fission proteins to a six-His affinity tag and purified to homogeneity. The enzyme had K-m values for ATP and glucose of 0.77 and 0.24 mM, respectively, and a V-max of 93 mu mol min(-1) mg(-1). A B. subtilis strain deficient for glucose kinase grew at the same rate on different carbon sources tested, including disaccharides such as maltose, trehalose, and sucrose.
引用
收藏
页码:3222 / 3226
页数:5
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