1p8q: Difference between revisions
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[[Image:1p8q.gif|left|200px]] | [[Image:1p8q.gif|left|200px]] | ||
'''Structural and Functional Importance of First-Shell Metal Ligands in the Binuclear Cluster of Arginase I.''' | {{Structure | ||
|PDB= 1p8q |SIZE=350|CAPTION= <scene name='initialview01'>1p8q</scene>, resolution 2.95Å | |||
|SITE= | |||
|LIGAND= <scene name='pdbligand=MN:MANGANESE+(II)+ION'>MN</scene> and <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene> | |||
|ACTIVITY= [http://en.wikipedia.org/wiki/Arginase Arginase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.5.3.1 3.5.3.1] | |||
|GENE= ARG1 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=10116 Rattus norvegicus]) | |||
}} | |||
'''Structural and Functional Importance of First-Shell Metal Ligands in the Binuclear Cluster of Arginase I.''' | |||
==Overview== | ==Overview== | ||
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==About this Structure== | ==About this Structure== | ||
1P8Q is a [ | 1P8Q is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Rattus_norvegicus Rattus norvegicus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1P8Q OCA]. | ||
==Reference== | ==Reference== | ||
Structural and functional importance of first-shell metal ligands in the binuclear manganese cluster of arginase I., Cama E, Emig FA, Ash DE, Christianson DW, Biochemistry. 2003 Jul 1;42(25):7748-58. PMID:[http:// | Structural and functional importance of first-shell metal ligands in the binuclear manganese cluster of arginase I., Cama E, Emig FA, Ash DE, Christianson DW, Biochemistry. 2003 Jul 1;42(25):7748-58. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/12820884 12820884] | ||
[[Category: Arginase]] | [[Category: Arginase]] | ||
[[Category: Rattus norvegicus]] | [[Category: Rattus norvegicus]] | ||
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[[Category: urea cycle]] | [[Category: urea cycle]] | ||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 13:21:22 2008'' | ||
Revision as of 14:21, 20 March 2008
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| , resolution 2.95Å | |||||||
|---|---|---|---|---|---|---|---|
| Ligands: | and | ||||||
| Gene: | ARG1 (Rattus norvegicus) | ||||||
| Activity: | Arginase, with EC number 3.5.3.1 | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
Structural and Functional Importance of First-Shell Metal Ligands in the Binuclear Cluster of Arginase I.
OverviewOverview
Arginase is a binuclear manganese metalloenzyme that hydrolyzes l-arginine to form l-ornithine and urea. The three-dimensional structures of D128E, D128N, D232A, D232C, D234E, H101N, and H101E arginases I have been determined by X-ray crystallographic methods to elucidate the roles of the first-shell metal ligands in the stability and catalytic activity of the enzyme. This work represents the first structure-based dissection of the binuclear manganese cluster using site-directed mutagenesis and X-ray crystallography. Substitution of the metal ligands compromises the catalytic activity of the enzyme, either by the loss or disruption of the metal cluster or the nucleophilic metal-bridging hydroxide ion. However, the substitution of the metal ligands or the reduction of Mn(2+)(A) or Mn(2+)(B) occupancy does not compromise enzyme-substrate affinity as reflected by K(M), which remains relatively invariant across this series of arginase variants. This implicates a nonmetal binding site for substrate l-arginine in the precatalytic Michaelis complex, as proposed based on analysis of the native enzyme structure (Kanyo, Z. F., Scolnick, L. R., Ash, D. E., and Christianson, D. W. (1996) Nature 383, 554-557).
About this StructureAbout this Structure
1P8Q is a Single protein structure of sequence from Rattus norvegicus. Full crystallographic information is available from OCA.
ReferenceReference
Structural and functional importance of first-shell metal ligands in the binuclear manganese cluster of arginase I., Cama E, Emig FA, Ash DE, Christianson DW, Biochemistry. 2003 Jul 1;42(25):7748-58. PMID:12820884
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