Inosamine-phosphate amidinotransferase catalyses two reactions in the biosynthesis of antibiotics in the streptomycin family. The structure of this enzyme is similar to that of glycine amidinotransferase, being an alpha-beta 5-propeller and the active site residues are in the same spatial positions.
Defined by 8 residues: GLU:A-9ASP:A-108ASP:A-179HIS:A-227ASP:A-229ASN:A-286HIS:A-331CYS:A-332