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1s0y

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[[Image:1s0y.gif|left|200px]]
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{{STRUCTURE_1s0y| PDB=1s0y | SCENE= }}
{{STRUCTURE_1s0y| PDB=1s0y | SCENE= }}
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'''The structure of trans-3-chloroacrylic acid dehalogenase, covalently inactivated by the mechanism-based inhibitor 3-bromopropiolate at 2.3 Angstrom resolution'''
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===The structure of trans-3-chloroacrylic acid dehalogenase, covalently inactivated by the mechanism-based inhibitor 3-bromopropiolate at 2.3 Angstrom resolution===
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==Overview==
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Isomer-specific 3-chloroacrylic acid dehalogenases function in the bacterial degradation of 1,3-dichloropropene, a compound used in agriculture to kill plant-parasitic nematodes. The crystal structure of the heterohexameric trans-3-chloroacrylic acid dehalogenase (CaaD) from Pseudomonas pavonaceae 170 inactivated by 3-bromopropiolate shows that Glu-52 in the alpha-subunit is positioned to function as the water-activating base for the addition of a hydroxyl group to C-3 of 3-chloroacrylate and 3-bromopropiolate, whereas the nearby Pro-1 in the beta-subunit is positioned to provide a proton to C-2. Two arginine residues, alphaArg-8 and alphaArg-11, interact with the C-1 carboxylate groups, thereby polarizing the alpha,beta-unsaturated acids. The reaction with 3-chloroacrylate results in the production of an unstable halohydrin, 3-chloro-3-hydroxypropanoate, which decomposes into the products malonate semialdehyde and HCl. In the inactivation mechanism, however, malonyl bromide is produced, which irreversibly alkylates the betaPro-1. CaaD is related to 4-oxalocrotonate tautomerase, with which it shares an N-terminal proline. However, in 4-oxalocrotonate tautomerase, Pro-1 functions as a base participating in proton transfer within a hydrophobic active site, whereas in CaaD, the acidic proline is stabilized in a hydrophilic active site. The altered active site environment of CaaD thus facilitates a previously unknown reaction in the tautomerase superfamily, the hydration of the alpha,beta-unsaturated bonds of trans-3-chloroacrylate and 3-bromopropiolate. The mechanism for these hydration reactions represents a novel catalytic strategy that results in carbon-halogen bond cleavage.
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{{ABSTRACT_PUBMED_14701869}}
==About this Structure==
==About this Structure==
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[[Category: Michael addition]]
[[Category: Michael addition]]
[[Category: Tautomerase family]]
[[Category: Tautomerase family]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 08:09:32 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 05:10:05 2008''

Revision as of 02:10, 28 July 2008

Image:1s0y.png

Template:STRUCTURE 1s0y

The structure of trans-3-chloroacrylic acid dehalogenase, covalently inactivated by the mechanism-based inhibitor 3-bromopropiolate at 2.3 Angstrom resolution

Template:ABSTRACT PUBMED 14701869

About this Structure

1S0Y is a Protein complex structure of sequences from Pseudomonas pavonaceae. Full crystallographic information is available from OCA.

Reference

The X-ray structure of trans-3-chloroacrylic acid dehalogenase reveals a novel hydration mechanism in the tautomerase superfamily., de Jong RM, Brugman W, Poelarends GJ, Whitman CP, Dijkstra BW, J Biol Chem. 2004 Mar 19;279(12):11546-52. Epub 2003 Dec 29. PMID:14701869

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