1mb4
From Proteopedia
(New page: 200px<br /><applet load="1mb4" size="450" color="white" frame="true" align="right" spinBox="true" caption="1mb4, resolution 1.84Å" /> '''Crystal structure of...) |
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| - | [[Image:1mb4.gif|left|200px]]<br /><applet load="1mb4" size=" | + | [[Image:1mb4.gif|left|200px]]<br /><applet load="1mb4" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="1mb4, resolution 1.84Å" /> | caption="1mb4, resolution 1.84Å" /> | ||
'''Crystal structure of aspartate semialdehyde dehydrogenase from vibrio cholerae with NADP and S-methyl-l-cysteine sulfoxide'''<br /> | '''Crystal structure of aspartate semialdehyde dehydrogenase from vibrio cholerae with NADP and S-methyl-l-cysteine sulfoxide'''<br /> | ||
==Overview== | ==Overview== | ||
| - | L-Aspartate-beta-semialdehyde dehydrogenase (ASADH) catalyzes the | + | L-Aspartate-beta-semialdehyde dehydrogenase (ASADH) catalyzes the reductive dephosphorylation of beta-aspartyl phosphate to L-aspartate-beta-semialdehyde in the aspartate biosynthetic pathway of plants and micro-organisms. The aspartate pathway produces fully one-quarter of the naturally occurring amino acids, but is not found in humans or other eukaryotic organisms, making ASADH an attractive target for the development of new antibacterial, fungicidal, or herbicidal compounds. We have determined the structure of ASADH from Vibrio cholerae in two states; the apoenzyme and a complex with NADP, and a covalently bound active site inhibitor, S-methyl-L-cysteine sulfoxide. Upon binding the inhibitor undergoes an enzyme-catalyzed reductive demethylation leading to a covalently bound cysteine that is observed in the complex structure. The enzyme is a functional homodimer, with extensive intersubunit contacts and a symmetrical 4-amino acid bridge linking the active site residues in adjacent subunits that could serve as a communication channel. The active site is essentially preformed, with minimal differences in active site conformation in the apoenzyme relative to the ternary inhibitor complex. The conformational changes that do occur result primarily from NADP binding, and are localized to the repositioning of two surface loops located on the rim at opposite sides of the NADP cleft. |
==About this Structure== | ==About this Structure== | ||
| - | 1MB4 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Vibrio_cholerae Vibrio cholerae] with CYS and NDP as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Aspartate-semialdehyde_dehydrogenase Aspartate-semialdehyde dehydrogenase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.2.1.11 1.2.1.11] Full crystallographic information is available from [http:// | + | 1MB4 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Vibrio_cholerae Vibrio cholerae] with <scene name='pdbligand=CYS:'>CYS</scene> and <scene name='pdbligand=NDP:'>NDP</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Aspartate-semialdehyde_dehydrogenase Aspartate-semialdehyde dehydrogenase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.2.1.11 1.2.1.11] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1MB4 OCA]. |
==Reference== | ==Reference== | ||
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[[Category: Blanco, J.]] | [[Category: Blanco, J.]] | ||
[[Category: Kabaleeswaran, V.]] | [[Category: Kabaleeswaran, V.]] | ||
| - | [[Category: Moore, R | + | [[Category: Moore, R A.]] |
| - | [[Category: Viola, R | + | [[Category: Viola, R E.]] |
[[Category: CYS]] | [[Category: CYS]] | ||
[[Category: NDP]] | [[Category: NDP]] | ||
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[[Category: vibrio cholerae]] | [[Category: vibrio cholerae]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 13:53:24 2008'' |
Revision as of 11:53, 21 February 2008
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Crystal structure of aspartate semialdehyde dehydrogenase from vibrio cholerae with NADP and S-methyl-l-cysteine sulfoxide
Overview
L-Aspartate-beta-semialdehyde dehydrogenase (ASADH) catalyzes the reductive dephosphorylation of beta-aspartyl phosphate to L-aspartate-beta-semialdehyde in the aspartate biosynthetic pathway of plants and micro-organisms. The aspartate pathway produces fully one-quarter of the naturally occurring amino acids, but is not found in humans or other eukaryotic organisms, making ASADH an attractive target for the development of new antibacterial, fungicidal, or herbicidal compounds. We have determined the structure of ASADH from Vibrio cholerae in two states; the apoenzyme and a complex with NADP, and a covalently bound active site inhibitor, S-methyl-L-cysteine sulfoxide. Upon binding the inhibitor undergoes an enzyme-catalyzed reductive demethylation leading to a covalently bound cysteine that is observed in the complex structure. The enzyme is a functional homodimer, with extensive intersubunit contacts and a symmetrical 4-amino acid bridge linking the active site residues in adjacent subunits that could serve as a communication channel. The active site is essentially preformed, with minimal differences in active site conformation in the apoenzyme relative to the ternary inhibitor complex. The conformational changes that do occur result primarily from NADP binding, and are localized to the repositioning of two surface loops located on the rim at opposite sides of the NADP cleft.
About this Structure
1MB4 is a Single protein structure of sequence from Vibrio cholerae with and as ligands. Active as Aspartate-semialdehyde dehydrogenase, with EC number 1.2.1.11 Full crystallographic information is available from OCA.
Reference
A structural basis for the mechanism of aspartate-beta-semialdehyde dehydrogenase from Vibrio cholerae., Blanco J, Moore RA, Kabaleeswaran V, Viola RE, Protein Sci. 2003 Jan;12(1):27-33. PMID:12493825
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