1yaa
From Proteopedia
(New page: 200px<br /><applet load="1yaa" size="450" color="white" frame="true" align="right" spinBox="true" caption="1yaa, resolution 2.05Å" /> '''ASPARTATE AMINOTRANS...) |
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| - | [[Image:1yaa.gif|left|200px]]<br /><applet load="1yaa" size=" | + | [[Image:1yaa.gif|left|200px]]<br /><applet load="1yaa" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="1yaa, resolution 2.05Å" /> | caption="1yaa, resolution 2.05Å" /> | ||
'''ASPARTATE AMINOTRANSFERASE FROM SACCHAROMYCES CEREVISIAE CYTOPLASM'''<br /> | '''ASPARTATE AMINOTRANSFERASE FROM SACCHAROMYCES CEREVISIAE CYTOPLASM'''<br /> | ||
==Overview== | ==Overview== | ||
| - | The crystal structure of Saccharomyces cerevisiae cytoplasmic aspartate | + | The crystal structure of Saccharomyces cerevisiae cytoplasmic aspartate aminotransferase (EC 2.6.1.1) has been determined to 2.05 A resolution in the presence of the cofactor pyridoxal-5'-phosphate and the competitive inhibitor maleate. The structure was solved by the method of molecular replacement. The final value of the crystallographic R-factor after refinement was 23.1% with good geometry of the final model. The yeast cytoplasmic enzyme is a homodimer with two identical active sites containing residues from each subunit. It is found in the "closed" conformation with a bound maleate inhibitor in each active site. It shares the same three-dimensional fold and active site residues as the aspartate aminotransferases from Escherichia coli, chicken cytoplasm, and chicken mitochondria, although it shares less than 50% sequence identity with any of them. The availability of four similar enzyme structures from distant regions of the evolutionary tree provides a measure of tolerated changes that can arise during millions of years of evolution. |
==About this Structure== | ==About this Structure== | ||
| - | 1YAA is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Saccharomyces_cerevisiae Saccharomyces cerevisiae] with MAE and PLP as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Aspartate_transaminase Aspartate transaminase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.6.1.1 2.6.1.1] Full crystallographic information is available from [http:// | + | 1YAA is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Saccharomyces_cerevisiae Saccharomyces cerevisiae] with <scene name='pdbligand=MAE:'>MAE</scene> and <scene name='pdbligand=PLP:'>PLP</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Aspartate_transaminase Aspartate transaminase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.6.1.1 2.6.1.1] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1YAA OCA]. |
==Reference== | ==Reference== | ||
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[[Category: Saccharomyces cerevisiae]] | [[Category: Saccharomyces cerevisiae]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
| - | [[Category: Jeffery, C | + | [[Category: Jeffery, C J.]] |
[[Category: MAE]] | [[Category: MAE]] | ||
[[Category: PLP]] | [[Category: PLP]] | ||
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[[Category: transferase]] | [[Category: transferase]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 16:03:21 2008'' |
Revision as of 14:03, 21 February 2008
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ASPARTATE AMINOTRANSFERASE FROM SACCHAROMYCES CEREVISIAE CYTOPLASM
Overview
The crystal structure of Saccharomyces cerevisiae cytoplasmic aspartate aminotransferase (EC 2.6.1.1) has been determined to 2.05 A resolution in the presence of the cofactor pyridoxal-5'-phosphate and the competitive inhibitor maleate. The structure was solved by the method of molecular replacement. The final value of the crystallographic R-factor after refinement was 23.1% with good geometry of the final model. The yeast cytoplasmic enzyme is a homodimer with two identical active sites containing residues from each subunit. It is found in the "closed" conformation with a bound maleate inhibitor in each active site. It shares the same three-dimensional fold and active site residues as the aspartate aminotransferases from Escherichia coli, chicken cytoplasm, and chicken mitochondria, although it shares less than 50% sequence identity with any of them. The availability of four similar enzyme structures from distant regions of the evolutionary tree provides a measure of tolerated changes that can arise during millions of years of evolution.
About this Structure
1YAA is a Single protein structure of sequence from Saccharomyces cerevisiae with and as ligands. Active as Aspartate transaminase, with EC number 2.6.1.1 Full crystallographic information is available from OCA.
Reference
Crystal structure of Saccharomyces cerevisiae cytosolic aspartate aminotransferase., Jeffery CJ, Barry T, Doonan S, Petsko GA, Ringe D, Protein Sci. 1998 Jun;7(6):1380-7. PMID:9655342
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