Abstract
Earlier it has been demonstrated that the active site (substrate-binding site + active site channel) of rat liver mitochondrial dicarboxylate transporter is characterized by rather complex topography. Probing the active site with 2-monoalkylmalonates revealed the existence of internal and external lipophilic areas separated by a polar region. A two substrate-binding site model of the transporter has been supposed. The correctness of this model has been evaluated by probing the active site with O-acyl-L-malates differing from 2-monoalkylmalonates by 0.23 nm longer distance from the anion groups to the aliphatic chain. Changes in the polar group of the probe did not prevent its binding and showed the same variable lipophilicity pattern for the transporter channel. Probing with α,ω-alkylene dimalonates did not reveal the second substrate-binding site at the active site. The substrate-binding site did not show any differences in affinity to O-acyl-derivatives of L-malate and D-malate, except L-malate binds more effectively than D-malate. This suggests involvement of the L-malate hydroxyl group in substrate binding and stereospecific behavior of the transporter substrate-binding site. A modified one substrate-binding site model of the dicarboxylate transporter is discussed.
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Original Russian Text © D. V. Mantaev, D. A. Aliverdieva, D. I. Bondarenko, K. F. Sholtz, 2006, published in Biokhimiya, 2006, Vol. 71, No. 7, pp. 984–995.
Originally published in Biochemistry (Moscow) On-Line Papers in Press, as Manuscript BM06-022, June 4, 2006.
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Mamaev, D.V., Aliverdieva, D.A., Bondarenko, D.I. et al. Study of active site topography of rat liver mitochondrial dicarboxylate transporter using lipophilic substrate derivatives. Biochemistry (Moscow) 71, 800–809 (2006). https://doi.org/10.1134/S0006297906070133
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DOI: https://doi.org/10.1134/S0006297906070133