Copper, Molybdenum and Vanadium in Biological Systems by B A Averill; et al

By B A Averill; et al

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This site should be compared to the met derivative of hemocyanin and tyrosinase only in the sense that it appears to contain two anti-ferromagnetically coupled copper(II)'s lacking an EPR signal. A characteristic "Blue" band of the type 1 copper is seen in the optical spectrum at 614 nm (e = 5700 M -1 cm-1). /'-.. H \ \ 1000 I 400 - 25'o0 Type, ill o'oo Gauss I 500 I 600 I 700 I nm f---'- 35'00 Fig. 38. Optical absorption spectra (room temperature) of native Rhus vernicifera laccase and native + low (~<10-fold excess) concentration N~', high (~> 100fold excess) concentration Nf and 30-fold excess peroxide, dialyzed.

Companion, A. , Komarynsky, M. : J. Chem. Educ. 41, 257 (1964) 49. , Mires, W. : Eur. J. Biochem. 84, 207 (1978) 50. Bannister, J. V. ): Structure and Function of Haemocyanin, Berlin, Springer-Verlag 1977 51. : Arch. Biochem. Biophys. 63, 165 (1956) 52. I-Iimmelwright, R. S. et al.! J. Am. Chem. Soc. 102, 5378 (1980) 53. Himmelwright, R. S. : J. Am. Chem. Soc. 102, 7339 (1980) 54. van Schaick, E. J. M. ) Lamy, J. , p. 353, New York, Marcel Dekker 1981 55. Magnus, K. , Love, W. , p. 363 56. Solomon, E.

2) I I - 1000 t J MET £ nm 600 800 1000 met. Similarly, the endogenous bridge provides the superexchange pathway in met (Cu-Cu also less than 4/~. from EXAFS studies al)) leading to coupled spins and lack of an EPR signal. Group 2 ligands force a separation greater than 5/~ in half-met, opening up a second exchangeable position at the Cu(II) when the endogenous bridge is broken. Group 2 ligands also maintain this larger separation in dimer, breaking the endogenous superexchange pathway and leading to EPR-detectable dipolar coupled Cu(II)'s.

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