Cited by 450Enzyme Structure and FunctionAmino Acid Enzymes and MetabolismMetal-Catalyzed Oxygenation Mechanisms

Structure of a unique binuclear manganese cluster in arginase

Kanyo, Zoltan F., Scolnick, Laura R., Ash, David E., Christianson, David W.·1996·Nature

Abstract

Each individual excretes roughly 10 kg of urea per year, as a result of the hydrolysis of arginine in the final cytosolic step of the urea cycle. This reaction allows the disposal of nitrogenous waste from protein catabolism, and is catalysed by the liver arginase enzyme. In other tissues that lack a complete urea cycle, arginase regulates cellular arginine and ornithine concentrations for biosynthetic reactions, including nitric oxide synthesis: in the macrophage, arginase activity is reciprocally coordinated with that of NO synthase to modulate NO-dependent cytotoxicity. The bioinorganic chemistry of arginase is particularly rich because this enzyme is one of very few that specifically requires a spin-coupled Mn2+-Mn2+ cluster for catalytic activity in vitro and in vivo. The 2.1 angstrom-resolution crystal structure of trimeric rat liver arginase reveals that this unique metal cluster resides at the bottom of an active-site cleft that is 15 angstroms deep. Analysis of the structure indicates that arginine hydrolysis is achieved by a metal-activated solvent molecule which symmetrically bridges the two Mn2+ ions.

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Crossref · 10.1038/383554a0

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24 of 24 references verified0 citation errors · 0 not checkable

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  • Each HDAC10 domain adopted the α/β-fold first observed in arginase and subsequently in the HDAC family.

    “Each domain adopted the α/β-fold first observed in the crystal structure of arginase25 and subsequently observed in the HDAC family26.”
  • HDACs adopt the same α/β-fold first observed in the crystal structure of arginase, a binuclear manganese metalloenzyme that catalyses hydrolysis of arginine to ornithine plus urea.

    “As previously mentioned, HDACs adopt the same α/β-fold first observed in the crystal structure of arginase, a binuclear manganese metalloenzyme that catalyses the hydrolysis of arginine to form ornithine plus urea1525.”

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Authors
Kanyo, Z. F., Scolnick, L. R., Ash, D. E., & Christianson, D. W.
Affiliations
  • University of Pennsylvania (US)
  • Temple University (US)
Venue
Nature
Published
1996-10
Volume
383
Issue
6600
Pages
554-557
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W2066916400
Cited by
441
References
26
Citations by year
2026: 18 · 2025: 6 · 2024: 18 · 2023: 12 · 2022: 9 · 2021: 8 · 2020: 17 · 2019: 15 · 2018: 15 · 2017: 14 · 2016: 8 · 2015: 13 · 2014: 11 · 2013: 18 · 2012: 15
FWCI
15.87
Type
journal article
Language
en
Open access
closed
Locations
  • Nature (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Institute of General Medical Sciences (R01GM067788)
Topics
  • Physical Sciences › Materials Science › Materials Chemistry › Enzyme Structure and Function
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Amino Acid Enzymes and Metabolism
  • Physical Sciences › Chemistry › Inorganic Chemistry › Metal-Catalyzed Oxygenation Mechanisms
Keywords
arginase, urea cycle, arginine hydrolysis, crystal structure, metalloenzyme active site, nitric oxide production, enzyme catalysis
MeSH terms
Animals, Arginase, Arginine, Binding Sites, Liver, Manganese, Metalloproteins, Models, Molecular, Protein Conformation, Protein Structure, Secondary, Crystallography, X-Ray, Rats

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