Spermine binding to liver mitochondria.
Non-equilibrium binding of spermine to mitochondrial membranes is studied in rat liver mitochondria by applying a new thermodynamic treatment of ligand-receptor interactions (Di Noto, V., Dalla Via, L., Toninello, A. and Vidali, M. (1996) Macromol. Theory Simul. 5, 165-181). The presence on mitochondrial membranes of two spermine binding sites, both with monocoordination, is demonstrated. The calculated binding energy is characteristic for weak interactions. The treatment allows also to evaluate the variations of the molar fraction ratio of spermine bound to sites 1 and 2 as function of total bound spermine. The possible role of the two sites is discussed.
Dalla Via
L
L
Dipartimento di Chimica Biologica, Università di Padova, Italy.
Di Noto
V
V
Siliprandi
D
D
Toninello
A
A
D000818:Animals; D001665:Binding Sites; D007425:Intracellular Membranes / Q000378:metabolism*; D007700:Kinetics; D008930:Mitochondria, Liver / Q000378:metabolism*; D008956:Models, Chemical; D051381:Rats; D013096:Spermine / Q000378:metabolism*
D013096:Spermine