Properties of the ribose-ring-opened adenine nucleotide, 2,2'(1-(9-adenyl)-1'-(tri-,diphosphoryl-oxymethyl))-dihydroxydiethylether in mitochondrial adenine-nucleotide translocation.
(Adenine-14C) or (gamma-32P)-labelled 2,2'[1-(9-adenyl)-1'-(tri-, diphosphoryl-oxymethyl]-dihydroxydiethylether (rroANP) was obtained from ANP by cleavage of the C-2--C-3' bond by sodium periodate oxidation and subsequent borohydride reduction. Binding of rroANP to rat liver mitochondria revealed carrier-linked (atractyloside-sensitive) and unspecific (atractyloside-insensitive) binding but no transfer across the inner mitochondrial membrane. Kinetic data indicate rroANP as a competitive inhibitor for ANP uptake with Ki = 9.3 X 10(-5) M. Experimental rroANP confirmed that an intact adenine base and three anio.nic charges of the phosphate chain are essential for the recognition between ANP-carrier and nucleotide but insufficient for the induction of a transmembrane ANP exchange. In addition mobilisation of the carrier-nucleotide complex requires an intact ribofuranoside ring system.
D000227:Adenine Nucleotides / Q000138:chemical synthesis; D000244:Adenosine Diphosphate / Q000031:analogs & derivatives / Q000378:metabolism; D000249:Adenosine Monophosphate / Q000031:analogs & derivatives / Q000378:metabolism; D000255:Adenosine Triphosphate / Q000031:analogs & derivatives* / Q000378:metabolism; D000818:Animals; D001665:Binding Sites; D001692:Biological Transport; D007700:Kinetics; D009682:Magnetic Resonance Spectroscopy; D008297:Male; D008930:Mitochondria, Liver / Q000378:metabolism*; D008968:Molecular Conformation; D051381:Rats; D013329:Structure-Activity Relationship; D014178:Translocation, Genetic
D000227:Adenine Nucleotides; D000249:Adenosine Monophosphate; D000244:Adenosine Diphosphate; D000255:Adenosine Triphosphate