Antibodies selected from whole antiserum by fusion proteins as tools for the study of the topology of mitochondrial membrane proteins. Evidence that the N-terminal extremity of the sixth alpha-helix of the uncoupling protein is facing the matrix.

作者: B Miroux , L Casteilla , S Klaus , S Raimbault , S Grandin

DOI: 10.1016/S0021-9258(18)42255-7

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摘要: The reactivity to freeze-thawed mitochondria or submitochondrial particles of a whole antiserum raised against the uncoupling protein has been investigated. Incubation with brown adipose tissue trapped antibodies reactive toward accessible parts protein. One-third one-half which were present in serum remained free. These highly vesicles obtained by sonication mitochondria, matricial side inner membrane was made accessible. To define epitopes recognized antiserum, different fusion proteins up MalE and fragments used. Immunoaffinity chromatography, using an immobilized purified containing amino acids 253 290 protein, selected specifically directed this part A more precise localization main epitope these is proposed. reacted only particles, indicating orientation epitope. This result, associated other data concerning related mitochondrial carriers such as ADP/ATP translocator phosphate carrier, allowed us determine sixth alpha-helix

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