1e5x

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{{STRUCTURE_1e5x| PDB=1e5x | SCENE= }}
{{STRUCTURE_1e5x| PDB=1e5x | SCENE= }}
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'''STRUCTURE OF THREONINE SYNTHASE FROM ARABIDOPSIS THALIANA'''
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===STRUCTURE OF THREONINE SYNTHASE FROM ARABIDOPSIS THALIANA===
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==Overview==
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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.
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(as it appears on PubMed at http://www.pubmed.gov), where 11344332 is the PubMed ID number.
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{{ABSTRACT_PUBMED_11344332}}
==About this Structure==
==About this Structure==
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[[Category: S-adenosyl-methionine]]
[[Category: S-adenosyl-methionine]]
[[Category: Threonine biosynthesis]]
[[Category: Threonine biosynthesis]]
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Revision as of 21:12, 30 June 2008

Image:1e5x.png

Template:STRUCTURE 1e5x

STRUCTURE OF THREONINE SYNTHASE FROM ARABIDOPSIS THALIANA

Template:ABSTRACT PUBMED 11344332

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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