Biomimetic and Bioorganic Chemistry by Gotthold Ebert (auth.)

By Gotthold Ebert (auth.)

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57 7 Summary . . . . . . . 57 8 References . . . . . . . . . . . . . . . 58 . . . . . . . . 37 Mitsuo Okahara, Yobji Nakatsuji 1 Introduction Certain natural antibiotics selectively complex with specific cations, which are considered to participate in the maintenance of organisms in vivo, and transfer them across lipophilic membranes against the concentration gradient. This selective transport is an important biological phenomenon. The modification of structures is expected for the understanding of the interaction between ionophores and cations, but it is very difficult because the number of such natural ionophores so far known is limited and the structures are very complicated ~' 2).

Cited from Ref. 5s)) 12 2~ ~8 (hi The carrier used in this transport system is only required to possess the nitrogen atom as a structural unit, which participates in the complexation. From the viewpoint of the simplicity in the structure, the development of new ionophores are expected. 3 Electron-drivenTransportSystems Grimaldi and Lehn succeeded in developing a new active transport system which performs selective transport of potassium cations coupled with the simultaneous flow of electrons in the same direction (symport) aeross a membrane containing an electron carrier and a cation carrier 59).

Chem. Soc. , Smith, R. , Luisi, P. : J. Biol. Chem. 256, 837 (1981) 71. , Luisi, P. : ibid. Mainz 1981 72. , Luisi, P. L. : Internat. Symposium on Colloid & Surface Science: Modern Trends of Colloid Science in Chemistry and Biology, Interlaken 1984 73. Bangham, A. , Standish, M. , Watkins, J. : J. Mol. Biol. 13, 238 (1965) 74. : Biochemistry 8, 344 (1969) 75. Tyrrell, D. , Heath, T. , CoUey, C. , Ryman, B. : Biochim. Biophys. Acta 457, 259 (t976) 76. Nakagaki, M. : Maku Gaku Nyumon, Tokyo, Kitami Shobo 1978 77.

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