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Independent 4 A electron density maps calculated for the extracellular nuclease of Staphylococcus aureus (based on data from three heavy-atom derivatives) and for a nuclease-thymidine-3',5'-diphosphate-calcium ion complex (based on a single isomorphous derivative) show about 60 per cent of the chain resolved, including 3(1/2) turns of helix. The pyrimidine ring of the inhibitor fits into a pocket in the enzyme and appears to be parallel to the ring of a tyrosyl residue. Conformational changes can be observed between the nuclease and the nuclease-inhibitor complex, but the two structures seem to be identical over most of the molecule.

THE EXTRACELLULAR NUCLEASE OF Staphylococcus aureus : STRUCTURES OF THE NATIVE ENZYME AND AN ENZYME-INHIBITOR COMPLEX AT 4 Å RESOLUTION