THE CRYSTAL STRUCTURE OF ISOCITRATE DEHYDROGENASE KINASE/PHOSPHATASE IN COMPLEX WITH ITS SUBSTRATE, ISOCITRATE DEHYDROGENASE, FROM ESCHERICHIA COLI. TRANSFERASE, HYDROLASE, KINASE PHOSPHATASE, GLYOXYLATE BYPASS, HYDROLASEPROTEIN PHOSPHATASE, TRICARBOXYLIC ACID CYCLE, ISOCITRATE 3LCB