Alves A M, Euverink G J, Bibb M J, Dijkhuizen L
Department of Microbiology, Groningen Biomolecular Sciences and Biotechnology Institute (GBB), University of Groningen, Haren, The Netherlands.
Appl Environ Microbiol. 1997 Mar;63(3):956-61. doi: 10.1128/aem.63.3.956-961.1997.
The ATP-dependent phosphofructokinase (ATP-PFK) of Streptomyces coelicolor A3(2) was purified to homogeneity (1,600-fold) and characterized (110 kDa, with a single type of subunit of 40 kDa); it is allosterically inhibited by phosphoenolpyruvate. Cloning of the pfk gene of S. coelicolor A3(2) and analysis of the deduced amino acid sequence (343 amino acids; 36,667 Da) revealed high similarities to the PPi-PFK enzyme from Amycolatopsis methanolica (tetramer, nonallosteric; 70%) and to the allosteric ATP-PFK enzymes from other bacteria, e.g., Escherichia coli (tetramer; 37%) and Bacillus stearothermophilus (tetramer, 41%). Further structural and functional analysis of the two actinomycete PFK enzymes should elucidate the features of these proteins that determine substrate specificity (ATP versus PPi) and allosteric (in)sensitivity.
天蓝色链霉菌A3(2)的ATP依赖性磷酸果糖激酶(ATP-PFK)被纯化至均一状态(1600倍)并进行了特性鉴定(110 kDa,具有单一类型的40 kDa亚基);它受到磷酸烯醇丙酮酸的变构抑制。天蓝色链霉菌A3(2)的pfk基因的克隆以及推导的氨基酸序列分析(343个氨基酸;36,667 Da)显示,其与甲醇拟无枝酸菌的PPi-PFK酶(四聚体,非变构;70%)以及其他细菌的变构ATP-PFK酶高度相似,例如大肠杆菌(四聚体;37%)和嗜热脂肪芽孢杆菌(四聚体,41%)。对这两种放线菌PFK酶的进一步结构和功能分析应能阐明决定底物特异性(ATP与PPi)和变构(不)敏感性的这些蛋白质的特征。