References

1.    J. Deisenhofer et al., Nature 318, 618 (1985);   S.W. Cowan et al., ibid. 358, 727 (1992);  A. Kruesch and G.E. Schultz, J. Mol. Biol. 243, 891 (1994).

2.    L. Heginbotham, T. Abramson, R. MacKinnon, Science 258, 1152 (1992); L. Heginbotham, Z. Lu, T. Abramson, R. MacKinnon, J. Biophys. 66, 1061 (1994).

3.    V. A. Parsegian, Ann. N.Y. Acad. Sci.264, 161 (1975).

4.    D. Sali, M. Byycroft, A.R. Fersht, Nature335, 740 (1988);  J. Advist, H. Luecke, F. A. Quiocho, A. Warshel, Proc. Natl. Acad. Sci. U.S.A. 88, 2026 (1991);  D.J. Lockhart and P.S. Kim, Science 257, 947 (1992);  ibid.260, 198 (1993).