1gz3 | pdb_00001gz3
MOLECULAR MECHANISM FOR THE REGULATION OF HUMAN MITOCHONDRIAL NAD(P)+-DEPENDENT MALIC ENZYME BY ATP AND FUMARATE
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| 1gz3, resolution 2.3Å | |||||||||||||
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| Sites: | AC1 | ||||||||||||
| Ligands: | ATP, FUM, MN, OXL | ||||||||||||
| Activity: | Malate dehydrogenase (oxaloacetate-decarboxylating), with EC number 1.1.1.38 | ||||||||||||
| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||||||||
Overview
The regulation of human mitochondrial NAD(P)+-dependent malic enzyme (m-NAD-ME) by ATP and fumarate may be crucial for the metabolism of glutamine for energy production in rapidly proliferating tissues and tumors. Here we report the crystal structure at 2.2 A resolution of m-NAD-ME in complex with ATP, Mn2+, tartronate, and fumarate. Our structural, kinetic, and mutagenesis studies reveal unexpectedly that ATP is an active-site inhibitor of the enzyme, despite the presence of an exo binding site. The structure also reveals the allosteric binding site for fumarate in the dimer interface. Mutations in this binding site abolished the activating effects of fumarate. Comparison to the structure in the absence of fumarate indicates a possible molecular mechanism for the allosteric function of this compound.
About this Structure
1GZ3 is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.
Reference
Molecular mechanism for the regulation of human mitochondrial NAD(P)+-dependent malic enzyme by ATP and fumarate., Yang Z, Lanks CW, Tong L, Structure. 2002 Jul;10(7):951-60. PMID:12121650
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