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1tf9

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[[Image:1tf9.gif|left|200px]]
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[[Image:1tf9.png|left|200px]]
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{{STRUCTURE_1tf9| PDB=1tf9 | SCENE= }}
{{STRUCTURE_1tf9| PDB=1tf9 | SCENE= }}
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'''Streptomyces griseus aminopeptidase complexed with P-Iodo-L-Phenylalanine'''
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===Streptomyces griseus aminopeptidase complexed with P-Iodo-L-Phenylalanine===
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==Overview==
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The bacterial aminopeptidase isolated from the extracellular extract of Streptomyces griseus (SGAP) is a double-zinc exopeptidase with a high preference for large hydrophobic amino-terminus residues. It is a monomer of a relatively low molecular weight (30 kDa), is heat-stable, displays a high and efficient catalytic turnover and its activity is modulated by calcium ions. Several free amino acids were found to inhibit the activity of SGAP in the millimolar concentration range and can therefore serve for the study of binding of both inhibitors and reaction products. The current study is focused on the X-ray crystallographic analysis of the SGAP complexes with L-tryptophan and p-iodo-L-phenylalanine, both at 1.30 A resolution. These two bulky inhibitory amino acids were found to bind to the active site of SGAP in very similar positions and orientations. Both of them bind to the two active-site zinc ions via their free carboxylate group, while displacing the zinc-bound water/hydroxide that is present in the native enzyme. Further stabilization of the binding of the amino-acid carboxylate group is achieved by its relatively strong interactions with the hydroxyl group of Tyr246 and the carboxylate group of Glu131. The binding is also stabilized by three specific hydrogen bonds between the amine group of the bound amino acid and enzyme residues Glu131, Asp160 and Arg202. These consistent interactions confirm the key role of these residues in the specific binding of the free amine of substrates and products, as proposed previously. The phenyl ring of Phe219 of the enzyme is involved in stacking interactions with the corresponding aromatic ring of the bound affector. This interaction seems to be important for the binding and orientation of the aromatic side chain within the specificity pocket. These structural results correlate well with the results obtained for the complexes of SGAP with other inhibitory amino acids and support the general catalytic mechanism proposed for this and related enzymes.
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(as it appears on PubMed at http://www.pubmed.gov), where 15388919 is the PubMed ID number.
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{{ABSTRACT_PUBMED_15388919}}
==About this Structure==
==About this Structure==
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[[Category: Double-zinc metalloproteinase]]
[[Category: Double-zinc metalloproteinase]]
[[Category: Protein-inhibitor complex]]
[[Category: Protein-inhibitor complex]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 09:52:54 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 12:56:02 2008''

Revision as of 09:56, 27 July 2008

Image:1tf9.png

Template:STRUCTURE 1tf9

Streptomyces griseus aminopeptidase complexed with P-Iodo-L-Phenylalanine

Template:ABSTRACT PUBMED 15388919

About this Structure

1TF9 is a Single protein structure of sequence from Streptomyces griseus. Full crystallographic information is available from OCA.

Reference

Binding of inhibitory aromatic amino acids to Streptomyces griseus aminopeptidase., Reiland V, Gilboa R, Spungin-Bialik A, Schomburg D, Shoham Y, Blumberg S, Shoham G, Acta Crystallogr D Biol Crystallogr. 2004 Oct;60(Pt 10):1738-46. Epub 2004, Sep 23. PMID:15388919

Page seeded by OCA on Sun Jul 27 12:56:02 2008

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