2q2x: Difference between revisions

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[[Image:2q2x.jpg|left|200px]]
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[[Image:2q2x.png|left|200px]]


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{{STRUCTURE_2q2x|  PDB=2q2x  |  SCENE=  }}  
{{STRUCTURE_2q2x|  PDB=2q2x  |  SCENE=  }}  


'''Crystal Structure of the ECH2 decarboxylase domain of CurF from Lyngbya majuscula'''
===Crystal Structure of the ECH2 decarboxylase domain of CurF from Lyngbya majuscula===




==Overview==
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Curacin A is a mixed polyketide/nonribosomal peptide possessing anti-mitotic and anti-proliferative activity. In the biosynthesis of curacin A, the N-terminal domain of the CurF multifunctional protein catalyzes decarboxylation of 3-methylglutaconyl-acyl carrier protein (ACP) to 3-methylcrotonyl-ACP, the postulated precursor of the cyclopropane ring of curacin A. This decarboxylase is encoded within an "HCS cassette" that is used by several other polyketide biosynthetic systems to generate chemical diversity by introduction of a beta-branch functional group to the natural product. The crystal structure of the CurF N-terminal ECH(2) domain establishes that the protein is a crotonase superfamily member. Ala(78) and Gly(118) form an oxyanion hole in the active site that includes only three polar side chains as potential catalytic residues. Site-directed mutagenesis and a biochemical assay established critical functions for His(240) and Lys(86), whereas Tyr(82) was nonessential. A decarboxylation mechanism is proposed in which His(240) serves to stabilize the substrate carboxylate and Lys(86) donates a proton to C-4 of the acyl-ACP enolate intermediate to form the Delta(2) unsaturated isopentenoyl-ACP product. The CurF ECH(2) domain showed a 20-fold selectivity for ACP-over CoA-linked substrates. Specificity for ACP-linked substrates has not been reported for any other crotonase superfamily decarboxylase. Tyr(73) may select against CoA-linked substrates by blocking a contact of Arg(38) with the CoA adenosine 5'-phosphate.
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{{ABSTRACT_PUBMED_17928301}}


==About this Structure==
==About this Structure==
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[[Category: Crotonase]]
[[Category: Crotonase]]
[[Category: Lyase]]
[[Category: Lyase]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May  4 14:13:45 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 08:59:14 2008''

Revision as of 05:59, 29 July 2008

File:2q2x.png

Template:STRUCTURE 2q2x

Crystal Structure of the ECH2 decarboxylase domain of CurF from Lyngbya majuscula

Template:ABSTRACT PUBMED 17928301

About this Structure

2Q2X is a Single protein structure of sequence from Lyngbya majuscula. Full crystallographic information is available from OCA.

Reference

Crystal structure of the ECH2 catalytic domain of CurF from Lyngbya majuscula. Insights into a decarboxylase involved in polyketide chain beta-branching., Geders TW, Gu L, Mowers JC, Liu H, Gerwick WH, Hakansson K, Sherman DH, Smith JL, J Biol Chem. 2007 Dec 7;282(49):35954-63. Epub 2007 Oct 10. PMID:17928301

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