2qb3: Difference between revisions

Revision as of 16:35, 29 July 2008

This article has been automatically seeded. Changes to this page should pertain to the PDB entry only and not to the protein or biomolecule in general.

File:2qb3.png

Template:STRUCTURE 2qb3

Structural Studies Reveal the Inactivation of E. coli L-Aspartate Aminotransferase by (s)-4,5-dihydro-2-thiophenecarboxylic acid (SADTA) via Two Mechanisms (at pH 7.5)Structural Studies Reveal the Inactivation of E. coli L-Aspartate Aminotransferase by (s)-4,5-dihydro-2-thiophenecarboxylic acid (SADTA) via Two Mechanisms (at pH 7.5)

Template:ABSTRACT PUBMED 17713924

About this StructureAbout this Structure

2QB3 is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.

ReferenceReference

Inactivation of Escherichia coli L-aspartate aminotransferase by (S)-4-amino-4,5-dihydro-2-thiophenecarboxylic acid reveals "a tale of two mechanisms"., Liu D, Pozharski E, Lepore BW, Fu M, Silverman RB, Petsko GA, Ringe D, Biochemistry. 2007 Sep 18;46(37):10517-27. Epub 2007 Aug 22. PMID:17713924

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Proteopedia Page Contributors and Editors (what is this?)Proteopedia Page Contributors and Editors (what is this?)

OCA

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-'''Structural Studies Reveal the Inactivation of E. coli L-Aspartate Aminotransferase by (s)-4,5-dihydro-2-thiophenecarboxylic acid (SADTA) via Two Mechanisms (at pH 7.5)'''
+===Structural Studies Reveal the Inactivation of E. coli L-Aspartate Aminotransferase by (s)-4,5-dihydro-2-thiophenecarboxylic acid (SADTA) via Two Mechanisms (at pH 7.5)===
-==Overview==
+<!--
-As a mechanism-based inactivator of PLP-enzymes, (S)-4-amino-4,5-dihydro-2-thiophenecarboxylic acid (SADTA) was cocrystallized with Escherichia coli aspartate aminotransferase (l-AspAT) at a series of pH values ranging from 6 to 8. Five structural models with high resolution (1.4-1.85 A) were obtained for l-AspAT-SADTA complexes at pH 6.0, 6.5, 7.0, 7.5, and 8.0. Electron densities of the models showed that two different adducts had formed in the active sites. One adduct was formed from SADTA covalently linked to pyridoxal 5'-phosphate (PLP) while the other adduct was formed with the inhibitor covalently linked to Lysine246,1 the active site lysine. Moreover, there is a strong indication based on the electron densities that the occurrence of the two adducts is pH dependent. We conclude that SADTA inactivates l-AspAT via two different mechanisms based on the binding direction of the inactivator. Additionally, the structural models also show pH dependence of the protein structure itself, which provided detailed mechanistic implications for l-AspAT.
+The line below this paragraph, {{ABSTRACT_PUBMED_17713924}}, adds the Publication Abstract to the page
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+{{ABSTRACT_PUBMED_17713924}}
 ==About this Structure==
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 [[Category: Plp]]
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