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By T. Kimura, U. Weser, C. E. Schaffer, S. Ahrland, W. Strohmeier

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0 . . . 2 . . . . -- . . 6 . 7 . 2 2,6-diaminopurine . Co lgfl . . . . . 2. Structural Considerations In general the pyrimidines show a much lower reactivity towards the metal ions. Apparently no reaction was observed with uracil while the stability constants of Cu-cytosine are even lower than the lgK1 and lgK2 values of Cu(NH3)~ 2+ (79). The high stability of the purine metal complexes can be attributed to the binding site at the imidazole residue. There the imino proton competes with the metal ion.

7 . 2 2,6-diaminopurine . Co lgfl . . . . . 2. Structural Considerations In general the pyrimidines show a much lower reactivity towards the metal ions. Apparently no reaction was observed with uracil while the stability constants of Cu-cytosine are even lower than the lgK1 and lgK2 values of Cu(NH3)~ 2+ (79). The high stability of the purine metal complexes can be attributed to the binding site at the imidazole residue. There the imino proton competes with the metal ion. Fig. 1 presents a model of the 2 : 1 complex of Cu-(adenine) 2.

23 ; A. San Pietro, ed. Yellow Springs, Ohio: Antioch Press 1965. 10. Blomstrom, D. , E. , W. D. Phillips, and J. F. Weiher: The nature of iron in ferredoxin. Proc. Nail. Acad. Sci. S. 57, 1085 (1964). 11. , G. Palmer, and R. H. Sands : On the ligand field of iron in ferredoxin from spinach chloroplasts and related non-heine iron protein. Proc. Natl. Acad. Sci. S. 55, 397 (1966). 12. Buchanan, B. B. : The chemistry and function of ferredoxin. Struct. Bonding I, 109 (1966). 13. --, W. Lovenberg, and J.

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