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1sv2

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{{STRUCTURE_1sv2| PDB=1sv2 | SCENE= }}
{{STRUCTURE_1sv2| PDB=1sv2 | SCENE= }}
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'''Crystal Structure of Peptide Deformylase from Leptospira Interrogans (LiPDF) at pH7.5'''
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===Crystal Structure of Peptide Deformylase from Leptospira Interrogans (LiPDF) at pH7.5===
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==Overview==
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Peptide deformylase is an attractive target for developing novel antibiotics. Previous studies at pH 3.0 showed peptide deformylase from Leptospira interrogans (LiPDF) exists as a dimer in which one monomer is in a closed form and the other is in an open form, with different conformations of the CD-loop controlling the entrance to the active pocket. Here we present structures of LiPDF at its active pH range. LiPDF forms a similar dimer at pH values 6.5-8.0 as it does at pH 3.0. Interestingly, both of the monomers are almost in the same closed form as that observed at pH 3.0. However, when the enzyme is complexed with the natural inhibitor actinotin, the conformation of the CD-loop is half-open. Two pairs of Arg109-mediated cation-pi interactions, as well as hydrogen bonds, have been identified to stabilize the different CD-loop conformations. These results indicate that LiPDF may be found in different structural states, a feature that has never before been observed in the peptide deformylase family. Based on our results, a novel substrate binding model, featured by an equilibrium between the closed and the open forms, is proposed. Our results present crystallographic evidence supporting population shift theory, which is distinguished from the conventional lock-and-key or induced-fit models. These results not only facilitate the development of peptide deformylase-targeted drugs but also provide structural insights into the mechanism of an unusual type of protein binding event.
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(as it appears on PubMed at http://www.pubmed.gov), where 16239225 is the PubMed ID number.
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==About this Structure==
==About this Structure==
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[[Category: Closed conformation]]
[[Category: Closed conformation]]
[[Category: Dimer]]
[[Category: Dimer]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 09:10:04 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 07:28:17 2008''

Revision as of 04:28, 28 July 2008

Image:1sv2.png

Template:STRUCTURE 1sv2

Crystal Structure of Peptide Deformylase from Leptospira Interrogans (LiPDF) at pH7.5

Template:ABSTRACT PUBMED 16239225

About this Structure

1SV2 is a Single protein structure of sequence from Leptospira interrogans. Full crystallographic information is available from OCA.

Reference

Novel conformational states of peptide deformylase from pathogenic bacterium Leptospira interrogans: implications for population shift., Zhou Z, Song X, Gong W, J Biol Chem. 2005 Dec 23;280(51):42391-6. Epub 2005 Oct 20. PMID:16239225

Page seeded by OCA on Mon Jul 28 07:28:17 2008

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