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== Function ==
== Function ==
[https://www.uniprot.org/uniprot/D3H0F7_ECO44 D3H0F7_ECO44]  
[https://www.uniprot.org/uniprot/D3H0F7_ECO44 D3H0F7_ECO44]  
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== Publication Abstract from PubMed ==
As a potential drug to treat neurological diseases, the mechanism-based inhibitor (S)-4-amino-4,5-dihydro-2-furancarboxylic acid (S-ADFA) has been found to inhibit the gamma-aminobutyric acid aminotransferase (GABA-AT) reaction. To circumvent the difficulties in structural studies of a S-ADFA-enzyme complex using GABA-AT, l-aspartate aminotransferase (l-AspAT) from Escherichia coli was used as a model PLP-dependent enzyme. Crystal structures of the E. coli aspartate aminotransferase with S-ADFA bound to the active site were obtained via cocrystallization at pH 7.5 and 8. The complex structures suggest that S-ADFA inhibits the transamination reaction by forming adducts with the catalytic lysine 246 via a covalent bond while producing 1 equiv of pyridoxamine 5'-phosphate (PMP). Based on the structures, formation of the K246-S-ADFA adducts requires a specific initial binding configuration of S-ADFA in the l-AspAT active site, as well as deprotonation of the epsilon-amino group of lysine 246 after the formation of the quinonoid and/or ketimine intermediate in the overall inactivation reaction.
Mechanism of Inactivation of Escherichia coli Aspartate Aminotransferase by (S)-4-Amino-4,5-dihydro-2-furancarboxylic Acid .,Liu D, Pozharski E, Fu M, Silverman RB, Ringe D Biochemistry. 2010 Nov 15. PMID:21033689<ref>PMID:21033689</ref>
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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==See Also==
==See Also==
*[[Aspartate aminotransferase 3D structures|Aspartate aminotransferase 3D structures]]
*[[Aspartate aminotransferase 3D structures|Aspartate aminotransferase 3D structures]]
== References ==
<references/>
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