Download MendeleyPotent and competitive inhibition of malic enzymes by lanthanide ions
Yang, Z., Batra, R., Floyd, D.L., Hung, H.-C., Chang, G.-G., Tong, L.(2000) Biochem Biophys Res Commun 274: 440-444
- PubMed: 10913357
- DOI: https://doi.org/10.1006/bbrc.2000.3163
- Primary Citation of Related Structures:
1PJL - PubMed Abstract:
The catalytic activity of malic enzyme (ME), a member of a new class of oxidative decarboxylases, requires the presence of divalent cations (Mn(2+), Mg(2+), and others). The crystal structure at 2.9 A resolution of human mitochondrial NAD(+)-dependent malic enzyme in a ternary complex with NAD(+) and the lanthanide ion Lu(3+), which has similar radius as Mn(2+), reveals a new conformation of the enzyme. The active site in this ternary complex is in an open form, while the organization of the tetramer of the enzyme actually resembles that with a closed active site. The Lu(3+) ion is bound to the enzyme at the same site as Mn(2+). Kinetic studies showed that Lu(3+) is a potent inhibitor of both the human NAD(P)(+)-dependent ME and the NADP(+)-dependent ME from pigeon liver, and is competitive with respect to the divalent cation, consistent with the structural information.
Organizational Affiliation:
Department of Biological Sciences, Columbia University, New York, New York, 10027, USA.
