1e5x
From Proteopedia
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|PDB= 1e5x |SIZE=350|CAPTION= <scene name='initialview01'>1e5x</scene>, resolution 2.25Å | |PDB= 1e5x |SIZE=350|CAPTION= <scene name='initialview01'>1e5x</scene>, resolution 2.25Å | ||
|SITE= | |SITE= | ||
| - | |LIGAND= | + | |LIGAND= <scene name='pdbligand=MSE:SELENOMETHIONINE'>MSE</scene>, <scene name='pdbligand=MSO:SELENOMETHIONINE+SELENOXIDE'>MSO</scene> |
| - | |ACTIVITY= [http://en.wikipedia.org/wiki/Threonine_synthase Threonine synthase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=4.2.3.1 4.2.3.1] | + | |ACTIVITY= <span class='plainlinks'>[http://en.wikipedia.org/wiki/Threonine_synthase Threonine synthase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=4.2.3.1 4.2.3.1] </span> |
|GENE= NUCLEAR ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=3702 Arabidopsis thaliana]) | |GENE= NUCLEAR ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=3702 Arabidopsis thaliana]) | ||
| + | |DOMAIN= | ||
| + | |RELATEDENTRY= | ||
| + | |RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1e5x FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1e5x OCA], [http://www.ebi.ac.uk/pdbsum/1e5x PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1e5x RCSB]</span> | ||
}} | }} | ||
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[[Category: threonine biosynthesis]] | [[Category: threonine biosynthesis]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 19:55:45 2008'' |
Revision as of 16:55, 30 March 2008
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| , resolution 2.25Å | |||||||
|---|---|---|---|---|---|---|---|
| Ligands: | , | ||||||
| Gene: | NUCLEAR (Arabidopsis thaliana) | ||||||
| Activity: | Threonine synthase, with EC number 4.2.3.1 | ||||||
| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
STRUCTURE OF THREONINE SYNTHASE FROM ARABIDOPSIS THALIANA
Overview
Threonine synthase (TS) is a PLP-dependent enzyme that catalyzes the last reaction in the synthesis of threonine from aspartate. In plants, the methionine pathway shares the same substrate, O-phospho-L-homoserine (OPH), and TS is activated by S-adenosyl-methionine (SAM), a downstream product of methionine synthesis. This positive allosteric effect triggered by the product of another pathway is specific to plants. The crystal structure of Arabidopsis thaliana apo threonine synthase was solved at 2.25 A resolution from triclinic crystals using MAD data from the selenomethionated protein. The structure reveals a four-domain dimer with a two-stranded beta-sheet arm protruding from one monomer onto the other. This domain swap could form a lever through which the allosteric effect is transmitted. The N-terminal domain (domain 1) has a unique fold and is partially disordered, whereas the structural core (domains 2 and 3) shares the functional domain of PLP enzymes of the same family. It also has similarities with SAM-dependent methyltransferases. Structure comparisons allowed us to propose potential sites for pyridoxal-phosphate and SAM binding on TS; they are close to regions that are disordered in the absence of these molecules.
About this Structure
1E5X is a Single protein structure of sequence from Arabidopsis thaliana. Full crystallographic information is available from OCA.
Reference
Crystal structure of threonine synthase from Arabidopsis thaliana., Thomazeau K, Curien G, Dumas R, Biou V, Protein Sci. 2001 Mar;10(3):638-48. PMID:11344332
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