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Binding of ATP to uncoupling protein of brown fat mitochondria as studied by means of spin‐labeled ATP derivatives
Author(s) -
Jakobs P.,
Braun A.,
Jezek P.,
Trommer W.E.
Publication year - 1991
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/0014-5793(91)80683-t
Subject(s) - uncoupling protein , nucleotide , chemistry , mitochondrion , adenosine triphosphate , biochemistry , atp–adp translocase , ribose , stereochemistry , inner mitochondrial membrane , enzyme , brown adipose tissue , gene , adipose tissue
ATP derivatives spin‐labeled (SL) at C8, N 6 , C2′ or C3′ were employed in binding studies with the uncoupling protein of brown fat mitochondria. Substitution of the ribose strongly impaired binding, whereas labeling of the adenine moiety allowed for tight and functional complex formation. Detailed binding studies with C8‐SL‐ATP confirmed the known pH and Mg 2+ dependence with a stoichiometry of one C8‐SL‐ATP bound per 66 kDa dimer. Corresponding studies of the uncoupling protein after modification with N ‐ethylmaleimide or diazobenzene‐4‐sulfonic acid revealed distinct differences in their effects on nucleotide binding and gating.