1olc: Difference between revisions

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[[Image:1olc.gif|left|200px]]
{{Seed}}
[[Image:1olc.png|left|200px]]


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{{STRUCTURE_1olc|  PDB=1olc  |  SCENE=  }}  
{{STRUCTURE_1olc|  PDB=1olc  |  SCENE=  }}  


'''OLIGO-PEPTIDE BINDING PROTEIN (OPPA) COMPLEXED WITH LYS-LYS-LYS-ALA'''
===OLIGO-PEPTIDE BINDING PROTEIN (OPPA) COMPLEXED WITH LYS-LYS-LYS-ALA===




==Overview==
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BACKGROUND: The periplasmic oligopeptide-binding protein OppA has a remarkably broad substrate specificity, binding peptides of two or five amino-acid residues with high affinity, but little regard to sequence. It is therefore an ideal system for studying how different chemical groups can be accommodated in a protein interior. The ability of the protein to bind peptides of different lengths has been studied by co-crystallising it with different ligands. RESULTS: Crystals of OppA from Salmonella typhimurium complexed with the peptides Lys-Lys-Lys (KKK) and Lys-Lys-Lys-Ala (KKKA) have been grown in the presence of uranyl ions which form important crystal contacts. These structures have been refined to 1.4 A and 2.1 A, respectively. The ligands are completely enclosed, their side chains pointing into large hydrated cavities and making few strong interactions with the protein. CONCLUSIONS: Tight peptide binding by OppA arises from strong hydrogen bonding and electrostatic interactions between the protein and the main chain of the ligand. Different basic side chains on the protein form salt bridges with the C terminus of peptide ligands of different lengths.
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{{ABSTRACT_PUBMED_8747465}}


==About this Structure==
==About this Structure==
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[[Category: Wilkinson, A J.]]
[[Category: Wilkinson, A J.]]
[[Category: Periplasmic]]
[[Category: Periplasmic]]
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Revision as of 02:04, 29 July 2008

File:1olc.png

Template:STRUCTURE 1olc

OLIGO-PEPTIDE BINDING PROTEIN (OPPA) COMPLEXED WITH LYS-LYS-LYS-ALA

Template:ABSTRACT PUBMED 8747465

About this Structure

1OLC is a Single protein structure of sequence from Salmonella typhimurium. Full crystallographic information is available from OCA.

Reference

The crystal structures of the oligopeptide-binding protein OppA complexed with tripeptide and tetrapeptide ligands., Tame JR, Dodson EJ, Murshudov G, Higgins CF, Wilkinson AJ, Structure. 1995 Dec 15;3(12):1395-406. PMID:8747465

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