2hu7: Difference between revisions
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[[Image:2hu7.jpg|left|200px]] | [[Image:2hu7.jpg|left|200px]] | ||
'''Binding of inhibitors by Acylaminoacyl peptidase''' | {{Structure | ||
|PDB= 2hu7 |SIZE=350|CAPTION= <scene name='initialview01'>2hu7</scene>, resolution 2.01Å | |||
|SITE= | |||
|LIGAND= <scene name='pdbligand=ACE:ACETYL+GROUP'>ACE</scene>, <scene name='pdbligand=PHE:PHENYLALANINE'>PHE</scene> and <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene> | |||
|ACTIVITY= [http://en.wikipedia.org/wiki/Acylaminoacyl-peptidase Acylaminoacyl-peptidase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.4.19.1 3.4.19.1] | |||
|GENE= | |||
}} | |||
'''Binding of inhibitors by Acylaminoacyl peptidase''' | |||
==Overview== | ==Overview== | ||
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==About this Structure== | ==About this Structure== | ||
2HU7 is a [ | 2HU7 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Aeropyrum_pernix Aeropyrum pernix]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2HU7 OCA]. | ||
==Reference== | ==Reference== | ||
The acylaminoacyl peptidase from Aeropyrum pernix K1 thought to be an exopeptidase displays endopeptidase activity., Kiss AL, Hornung B, Radi K, Gengeliczki Z, Sztaray B, Juhasz T, Szeltner Z, Harmat V, Polgar L, J Mol Biol. 2007 Apr 27;368(2):509-20. Epub 2007 Feb 20. PMID:[http:// | The acylaminoacyl peptidase from Aeropyrum pernix K1 thought to be an exopeptidase displays endopeptidase activity., Kiss AL, Hornung B, Radi K, Gengeliczki Z, Sztaray B, Juhasz T, Szeltner Z, Harmat V, Polgar L, J Mol Biol. 2007 Apr 27;368(2):509-20. Epub 2007 Feb 20. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/17350041 17350041] | ||
[[Category: Acylaminoacyl-peptidase]] | [[Category: Acylaminoacyl-peptidase]] | ||
[[Category: Aeropyrum pernix]] | [[Category: Aeropyrum pernix]] | ||
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[[Category: enzyme-inhibitor complex]] | [[Category: enzyme-inhibitor complex]] | ||
''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 17:21:36 2008'' | ||
Revision as of 18:21, 20 March 2008
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| , resolution 2.01Å | |||||||
|---|---|---|---|---|---|---|---|
| Ligands: | , and | ||||||
| Activity: | Acylaminoacyl-peptidase, with EC number 3.4.19.1 | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
Binding of inhibitors by Acylaminoacyl peptidase
OverviewOverview
Mammalian acylaminoacyl peptidase, a member of the prolyl oligopeptidase family of serine peptidases, is an exopeptidase, which removes acylated amino acid residues from the N terminus of oligopeptides. We have investigated the kinetics and inhibitor binding of the orthologous acylaminoacyl peptidase from the thermophile Aeropyrum pernix K1 (ApAAP). Complex pH-rate profiles were found with charged substrates, indicating a strong electrostatic effect in the surroundings of the active site. Unexpectedly, we have found that oligopeptides can be hydrolysed beyond the N-terminal peptide bond, demonstrating that ApAAP exhibits endopeptidase activity. It was thought that the enzyme is specific for hydrophobic amino acids, in particular phenylalanine, in accord with the non-polar S1 subsite of ApAAP. However, cleavage after an Ala residue contradicted this notion and demonstrated that P1 residues of different nature may bind to the S1 subsite depending on the remaining peptide residues. The crystal structures of the complexes formed between the enzyme and product-like inhibitors identified the oxyanion-binding site unambiguously and demonstrated that the phenylalanine ring of the P1 peptide residue assumes a position different from that established in a previous study, using 4-nitrophenylphosphate. We have found that the substrate-binding site extends beyond the S2 subsite, being capable of binding peptides with a longer N terminus. The S2 subsite displays a non-polar character, which is unique among the enzymes of this family. The S3 site was identified as a hydrophobic region that does not form hydrogen bonds with the inhibitor P3 residue. The enzyme-inhibitor complexes revealed that, upon ligand-binding, the S1 subsite undergoes significant conformational changes, demonstrating the plasticity of the specificity site.
About this StructureAbout this Structure
2HU7 is a Single protein structure of sequence from Aeropyrum pernix. Full crystallographic information is available from OCA.
ReferenceReference
The acylaminoacyl peptidase from Aeropyrum pernix K1 thought to be an exopeptidase displays endopeptidase activity., Kiss AL, Hornung B, Radi K, Gengeliczki Z, Sztaray B, Juhasz T, Szeltner Z, Harmat V, Polgar L, J Mol Biol. 2007 Apr 27;368(2):509-20. Epub 2007 Feb 20. PMID:17350041
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