2bhd: Difference between revisions
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[[Image:2bhd.jpg|left|200px]] | [[Image:2bhd.jpg|left|200px]] | ||
'''MG SUBSTITUTED E. COLI AMINOPEPTIDASE P IN COMPLEX WITH PRODUCT''' | {{Structure | ||
|PDB= 2bhd |SIZE=350|CAPTION= <scene name='initialview01'>2bhd</scene>, resolution 2.50Å | |||
|SITE= <scene name='pdbsite=AC1:Flc+Binding+Site+For+Chain+A'>AC1</scene> | |||
|LIGAND= <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene> and <scene name='pdbligand=FLC:CITRATE ANION'>FLC</scene> | |||
|ACTIVITY= [http://en.wikipedia.org/wiki/Xaa-Pro_aminopeptidase Xaa-Pro aminopeptidase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.4.11.9 3.4.11.9] | |||
|GENE= | |||
}} | |||
'''MG SUBSTITUTED E. COLI AMINOPEPTIDASE P IN COMPLEX WITH PRODUCT''' | |||
==Overview== | ==Overview== | ||
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==About this Structure== | ==About this Structure== | ||
2BHD is a [ | 2BHD is a [[Protein complex]] structure of sequences from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2BHD OCA]. | ||
==Reference== | ==Reference== | ||
Structural and functional implications of metal ion selection in aminopeptidase P, a metalloprotease with a dinuclear metal center., Graham SC, Bond CS, Freeman HC, Guss JM, Biochemistry. 2005 Oct 25;44(42):13820-36. PMID:[http:// | Structural and functional implications of metal ion selection in aminopeptidase P, a metalloprotease with a dinuclear metal center., Graham SC, Bond CS, Freeman HC, Guss JM, Biochemistry. 2005 Oct 25;44(42):13820-36. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/16229471 16229471] | ||
[[Category: Escherichia coli]] | [[Category: Escherichia coli]] | ||
[[Category: Protein complex]] | [[Category: Protein complex]] | ||
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[[Category: proline-specific peptidase]] | [[Category: proline-specific peptidase]] | ||
''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 16:01:57 2008'' | ||
Revision as of 14:02, 20 March 2008
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| 2bhd, resolution 2.50Å | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sites: | AC1 | ||||||||||||
| Ligands: | MG and FLC | ||||||||||||
| Activity: | Xaa-Pro aminopeptidase, with EC number 3.4.11.9 | ||||||||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||||||||
MG SUBSTITUTED E. COLI AMINOPEPTIDASE P IN COMPLEX WITH PRODUCT
Overview
The effect of metal substitution on the activity and structure of the aminopeptidase P (APPro) from Escherichia coli has been investigated. Measurements of activity in the presence of Mn2+, Mg2+, Zn2+, Na+, and Ca2+ show that significant activity is seen only in the Mn-bound form of the enzyme. The addition of Zn2+ to [MnMn(APPro)] is strongly inhibitory. Crystal structures of [MnMn(APPro)], [MgMg(APPro)], [ZnZn(APPro)], [ZnMg(APPro)], [Ca_(APPro)], [Na_(APPro)], and [apo(APPro)] were determined. The structures of [Ca_(APPro)] and [Na_(APPro)] have a single metal atom at their active site. Surprisingly, when a tripeptide substrate (ValProLeu) was soaked into [Na_(APPro)] crystals in the presence of 200 mM Mg2+, the structure had substrate, but no metal, bound at the active site. The structure of apo APPro complexed with ValProLeu shows that the N-terminal amino group of a substrate can be bound at the active site by carboxylate side chains that normally bind the second metal atom, providing a model for substrate binding in a single-metal active enzyme. Structures of [MnMn(APPro)] and [ZnZn(APPro)] complexes of ProLeu, a product inhibitor, in the presence of excess Zn reveal a third metal-binding site, formed by two conserved His residues and the dipeptide inhibitor. A Zn atom bound at such a site would stabilize product binding and enhance inhibition.
About this Structure
2BHD is a Protein complex structure of sequences from Escherichia coli. Full crystallographic information is available from OCA.
Reference
Structural and functional implications of metal ion selection in aminopeptidase P, a metalloprotease with a dinuclear metal center., Graham SC, Bond CS, Freeman HC, Guss JM, Biochemistry. 2005 Oct 25;44(42):13820-36. PMID:16229471
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