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2hp3

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{{STRUCTURE_2hp3| PDB=2hp3 | SCENE= }}
{{STRUCTURE_2hp3| PDB=2hp3 | SCENE= }}
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'''Crystal structure of iminodisuccinate epimerase'''
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===Crystal structure of iminodisuccinate epimerase===
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==Overview==
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Iminodisuccinate (IDS) epimerase catalyzes the epimerisation of R,R-, S,S- and R,S- iminodisuccinate, one step in the biodegradation of the chelating agent iminodisuccinate by Agrobacterium tumefaciens BY6. The enzyme is a member of the MmgE/PrpD protein family, a diverse and little characterized class of proteins of prokaryotic and eukaryotic origin. IDS epimerase does not show significant overall amino acid sequence similarity to any other protein of known three-dimensional structure. The crystal structure of this novel epimerase has been determined by multi-wavelength diffraction to 1.5 A resolution using selenomethionine-substituted enzyme. In the crystal, the enzyme forms a homo-dimer, and the subunit consists of two domains. The larger domain, not consecutive in sequence and comprising residues Met1-Lys266 and Leu400-Pro446, forms a novel all alpha-helical fold with a central six-helical bundle. The second, smaller domain folds into an alpha+beta domain, related in topology to chorismate mutase by a circular permutation. IDS epimerase is thus not related in three-dimensional structure to other known epimerases. The fold of the IDS epimerase is representative for the whole MmgE/PrpD family. The putative active site is located at the interface between the two domains of the subunit, and is characterized by a positively charged surface, consistent with the binding of a highly negatively charged substrate such as iminodisuccinate. Docking experiments suggest a two-base mechanism for the epimerisation reaction.
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{{ABSTRACT_PUBMED_16934291}}
==About this Structure==
==About this Structure==
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[[Category: Chorismate mutase like]]
[[Category: Chorismate mutase like]]
[[Category: Mmge/prpd fold]]
[[Category: Mmge/prpd fold]]
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Revision as of 05:06, 28 July 2008

Image:2hp3.png

Template:STRUCTURE 2hp3

Crystal structure of iminodisuccinate epimerase

Template:ABSTRACT PUBMED 16934291

About this Structure

2HP3 is a Single protein structure of sequence from Agrobacterium tumefaciens. Full crystallographic information is available from OCA.

Reference

Three-dimensional structure of iminodisuccinate epimerase defines the fold of the MmgE/PrpD protein family., Lohkamp B, Bauerle B, Rieger PG, Schneider G, J Mol Biol. 2006 Sep 22;362(3):555-66. Epub 2006 Jul 29. PMID:16934291

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