1m22
From Proteopedia
| Line 1: | Line 1: | ||
| - | [[Image:1m22.gif|left|200px]] | + | [[Image:1m22.gif|left|200px]] |
| - | + | ||
| - | '''X-ray structure of native peptide amidase from Stenotrophomonas maltophilia at 1.4 A''' | + | {{Structure |
| + | |PDB= 1m22 |SIZE=350|CAPTION= <scene name='initialview01'>1m22</scene>, resolution 1.40Å | ||
| + | |SITE= | ||
| + | |LIGAND= <scene name='pdbligand=EPE:4-(2-HYDROXYETHYL)-1-PIPERAZINE ETHANESULFONIC ACID'>EPE</scene> | ||
| + | |ACTIVITY= | ||
| + | |GENE= | ||
| + | }} | ||
| + | |||
| + | '''X-ray structure of native peptide amidase from Stenotrophomonas maltophilia at 1.4 A''' | ||
| + | |||
==Overview== | ==Overview== | ||
| Line 7: | Line 16: | ||
==About this Structure== | ==About this Structure== | ||
| - | 1M22 is a [ | + | 1M22 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Stenotrophomonas_maltophilia Stenotrophomonas maltophilia]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1M22 OCA]. |
==Reference== | ==Reference== | ||
| - | An alternative mechanism for amidase signature enzymes., Labahn J, Neumann S, Buldt G, Kula MR, Granzin J, J Mol Biol. 2002 Oct 4;322(5):1053-64. PMID:[http:// | + | An alternative mechanism for amidase signature enzymes., Labahn J, Neumann S, Buldt G, Kula MR, Granzin J, J Mol Biol. 2002 Oct 4;322(5):1053-64. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/12367528 12367528] |
[[Category: Single protein]] | [[Category: Single protein]] | ||
[[Category: Stenotrophomonas maltophilia]] | [[Category: Stenotrophomonas maltophilia]] | ||
| Line 22: | Line 31: | ||
[[Category: eleven-stranded beta sheet]] | [[Category: eleven-stranded beta sheet]] | ||
| - | ''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 12:37:55 2008'' |
Revision as of 10:37, 20 March 2008
| |||||||
| , resolution 1.40Å | |||||||
|---|---|---|---|---|---|---|---|
| Ligands: | |||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
X-ray structure of native peptide amidase from Stenotrophomonas maltophilia at 1.4 A
Overview
The peptide amidase from Stenotrophomonas maltophilia catalyses predominantly the hydrolysis of the C-terminal amide bond in peptide amides. Peptide bonds or amide functions in amino acid side-chains are not hydrolysed. This specificity makes peptide amidase (Pam) interesting for different biotechnological applications. Pam belongs to the amidase signature (AS) family. It is the first protein within this family whose tertiary structure has been solved. The structure of the native Pam has been determined with a resolution of 1.4A and in complex with the competitive inhibitor chymostatin at a resolution of 1.8A. Chymostatin, which forms acyl adducts with many serine proteases, binds non-covalently to this enzyme.Pam folds as a very compact single-domain protein. The AS sequence represents a core domain that is covered by alpha-helices. This AS domain contains the catalytic residues. It is topologically homologous to the phosphoinositol phosphatase domain.The structural data do not support the recently proposed Ser-Lys catalytic dyad mechanism for AS enzymes. Our results are in agreement with the role of Ser226 as the primary nucleophile but differ concerning the roles of Ser202 and Lys123: Ser202, with direct contact both to the substrate molecule and to Ser226, presumably serves as an acid/bases catalyst. Lys123, with direct contact to Ser202 but no contact to Ser226 or the substrate molecule, most likely acts as an acid catalyst.
About this Structure
1M22 is a Single protein structure of sequence from Stenotrophomonas maltophilia. Full crystallographic information is available from OCA.
Reference
An alternative mechanism for amidase signature enzymes., Labahn J, Neumann S, Buldt G, Kula MR, Granzin J, J Mol Biol. 2002 Oct 4;322(5):1053-64. PMID:12367528
Page seeded by OCA on Thu Mar 20 12:37:55 2008
