Pittner F, Tovarova I I, Kornitskaya E Y, Khokhlov A S, Hoffmann-Ostenhof O
Mol Cell Biochem. 1979 May 6;25(1):43-6. doi: 10.1007/BF00211140.
It could be shown that Streptomyces griseus, the microorganism producing the antibiotic streptomycin and also mutant strains of this species that cannot synthesize streptomycin, possess myo-inositol-1-phosphate synthase (EC 5.5.1.4), the enzyme cyclizing D-glucose 6-phosphate. The enzyme isolated from that organism is extremely instable, its molecular weight is approximately 260,000, and it requires a divalent metal ion for its activity. This is the first instance that an enzyme of this specificity has been found in a prokaryotic organism.