This the C-terminal protein kinase domain of bacterial isocitrate dehydrogenase kinase/phosphatase (AceK) proteins (EC:2.7.1.116) [1,2]. It has a classic bi-lobe protein kinase fold with the ATP-binding cleft located at the interface between the two lobes. The N-terminal lobe comprises a twisted antiparallel beta-sheet of five strands and two alpha-helices. The C-terminal lobe is larger and mainly alpha-helical, with some stretches of antiparallel beta-strands [2].

1: Size and sequence polymorphism in the isocitrate dehydrogenase kinase/phosphatase gene (aceK) and flanking regions in Salmonella enterica and Escherichia coli. Nelson K, Wang FS, Boyd EF, Selander RK; Genetics 1997;147:1509-1520. PMID:9409817

2: Structure of the bifunctional isocitrate dehydrogenase kinase/phosphatase. Zheng J, Jia Z; Nature. 2010;465:961-965. PMID:20505668