Cited by 116Enzyme Structure and FunctionProtein Structure and DynamicsBiochemical Acid Research Studies

Crystal Structure of Porcine Mitochondrial NADP+-dependent Isocitrate Dehydrogenase Complexed with Mn2+ and Isocitrate

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Ceccarelli, Christopher, Grodsky, Neil B., Ariyaratne, Nandana, Colman, Roberta F., Bahnson, Brian J.·2002·Journal of Biological Chemistry

Abstract

The crystal structure of porcine heart mitochondrial NADP+-dependent isocitrate dehydrogenase (IDH) complexed with Mn2+ and isocitrate was solved to a resolution of 1.85 A. The enzyme was expressed in Escherichia coli, purified as a fusion protein with maltose binding protein, and cleaved with thrombin to yield homogeneous enzyme. The structure was determined by multiwavelength anomalous diffraction phasing using selenium substitution in the form of selenomethionine as the anomalous scatterer. The porcine NADP+-IDH enzyme is structurally compared with the previously solved structures of IDH from E. coli and Bacillus subtilis that share 16 and 17% identity, respectively, with the mammalian enzyme. The porcine enzyme has a protein fold similar to the bacterial IDH structures with each monomer folding into two domains. However, considerable differences exist between the bacterial and mammalian forms of IDH in regions connecting core secondary structure. Based on the alignment of sequence and structure among the porcine, E. coli, and B. subtilis IDH, a putative phosphorylation site has been identified for the mammalian enzyme. The active site, including the bound Mn2+-isocitrate complex, is highly ordered and, therefore, mechanistically informative. The consensus IDH mechanism predicts that the Mn2+-bound hydroxyl of isocitrate is deprotonated prior to its NADP+-dependent oxidation. The present crystal structure has an active site water that is well positioned to accept the proton and ultimately transfer the proton to solvent through an additional bound water.

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Crossref · 10.1074/jbc.m207306200

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Authors
Ceccarelli, C., Grodsky, N. B., Ariyaratne, N., Colman, R. F., & Bahnson, B. J.
Affiliations
University of Delaware (US)
Corresponding author
Bahnson, Brian J.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2002-11
Volume
277
Issue
45
Pages
43454-43462
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2083437014
Cited by
116
References
55
Citations by year
2026: 5 · 2025: 4 · 2024: 1 · 2023: 2 · 2022: 1 · 2021: 5 · 2020: 6 · 2019: 6 · 2018: 2 · 2017: 3 · 2016: 5 · 2015: 5 · 2014: 3 · 2013: 5 · 2012: 11
FWCI
3.27
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
National Heart, Lung, and Blood Institute (HL67774, R01HL067774)
Topics
  • Physical Sciences › Materials Science › Materials Chemistry › Enzyme Structure and Function
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Structure and Dynamics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Biochemical Acid Research Studies
Keywords
NADP-isocitrate dehydrogenase, manganese binding, isocitrate, enzyme active site, phosphorylation sites, proton transfer mechanism, selenomethionine
MeSH terms
Amino Acid Sequence, Animals, Binding Sites, Cloning, Molecular, Escherichia coli, Isocitrate Dehydrogenase, Isocitrates, Kinetics, Manganese, Mitochondria, Models, Molecular, Molecular Sequence Data, Plasmids, Recombinant Proteins, Swine, Sequence Alignment, Sequence Homology, Amino Acid, Protein Structure, Secondary, Crystallography, X-Ray, Protein Subunits

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