1eps
From Proteopedia
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'''STRUCTURE AND TOPOLOGICAL SYMMETRY OF THE GLYPHOSPHATE 5-ENOL-PYRUVYLSHIKIMATE-3-PHOSPHATE SYNTHASE: A DISTINCTIVE PROTEIN FOLD'''<br /> | '''STRUCTURE AND TOPOLOGICAL SYMMETRY OF THE GLYPHOSPHATE 5-ENOL-PYRUVYLSHIKIMATE-3-PHOSPHATE SYNTHASE: A DISTINCTIVE PROTEIN FOLD'''<br /> | ||
==Overview== | ==Overview== | ||
| - | 5-enol-Pyruvylshikimate-3-phosphate synthase (EPSP synthase; | + | 5-enol-Pyruvylshikimate-3-phosphate synthase (EPSP synthase; phosphoenolpyruvate:3-phosphoshikimate 1-carboxyvinyltransferase, EC 2.5.1.19) is an enzyme on the pathway toward the synthesis of aromatic amino acids in plants, fungi, and bacteria and is the target of the broad-spectrum herbicide glyphosate. The three-dimensional structure of the enzyme from Escherichia coli has been determined by crystallographic techniques. The polypeptide backbone chain was traced by examination of an electron density map calculated at 3-A resolution. The two-domain structure has a distinctive fold and appears to be formed by 6-fold replication of a protein folding unit comprising two parallel helices and a four-stranded sheet. Each domain is formed from three of these units, which are related by an approximate threefold symmetry axis; in each domain three of the helices are completely buried by a surface formed from the three beta-sheets and solvent-accessible faces of the other three helices. The domains are related by an approximate dyad, but in the present crystals the molecule does not display pseudo-symmetry related to the symmetry of point group 32 because its approximate threefold axes are almost normal. A possible relation between the three-dimensional structure of the protein and the linear sequence of its gene will be described. The topological threefold symmetry and orientation of each of the two observed globular domains may direct the binding of substrates and inhibitors by a helix macrodipole effect and implies that the active site is located near the interdomain crossover segments. The structure also suggests a rationale for the glyphosate tolerance conferred by sequence alterations. |
==About this Structure== | ==About this Structure== | ||
| - | 1EPS is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Active as [http://en.wikipedia.org/wiki/Riboflavin_synthase Riboflavin synthase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.5.1.9 2.5.1.9] Full crystallographic information is available from [http:// | + | 1EPS is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Active as [http://en.wikipedia.org/wiki/Riboflavin_synthase Riboflavin synthase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.5.1.9 2.5.1.9] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1EPS OCA]. |
==Reference== | ==Reference== | ||
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[[Category: Riboflavin synthase]] | [[Category: Riboflavin synthase]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
| - | [[Category: Abdel-Meguid, S | + | [[Category: Abdel-Meguid, S S.]] |
| - | [[Category: Anderson, K | + | [[Category: Anderson, K S.]] |
| - | [[Category: Dayringer, H | + | [[Category: Dayringer, H E.]] |
| - | [[Category: Kishore, G | + | [[Category: Kishore, G M.]] |
| - | [[Category: Leimgruber, N | + | [[Category: Leimgruber, N K.]] |
| - | [[Category: Lim, L | + | [[Category: Lim, L W.]] |
| - | [[Category: Padgette, S | + | [[Category: Padgette, S R.]] |
| - | [[Category: Shieh, H | + | [[Category: Shieh, H S.]] |
| - | [[Category: Sikorski, J | + | [[Category: Sikorski, J A.]] |
| - | [[Category: Stallings, W | + | [[Category: Stallings, W C.]] |
| - | [[Category: Stegeman, R | + | [[Category: Stegeman, R A.]] |
[[Category: transferase]] | [[Category: transferase]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 12:30:24 2008'' |
Revision as of 10:30, 21 February 2008
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STRUCTURE AND TOPOLOGICAL SYMMETRY OF THE GLYPHOSPHATE 5-ENOL-PYRUVYLSHIKIMATE-3-PHOSPHATE SYNTHASE: A DISTINCTIVE PROTEIN FOLD
Overview
5-enol-Pyruvylshikimate-3-phosphate synthase (EPSP synthase; phosphoenolpyruvate:3-phosphoshikimate 1-carboxyvinyltransferase, EC 2.5.1.19) is an enzyme on the pathway toward the synthesis of aromatic amino acids in plants, fungi, and bacteria and is the target of the broad-spectrum herbicide glyphosate. The three-dimensional structure of the enzyme from Escherichia coli has been determined by crystallographic techniques. The polypeptide backbone chain was traced by examination of an electron density map calculated at 3-A resolution. The two-domain structure has a distinctive fold and appears to be formed by 6-fold replication of a protein folding unit comprising two parallel helices and a four-stranded sheet. Each domain is formed from three of these units, which are related by an approximate threefold symmetry axis; in each domain three of the helices are completely buried by a surface formed from the three beta-sheets and solvent-accessible faces of the other three helices. The domains are related by an approximate dyad, but in the present crystals the molecule does not display pseudo-symmetry related to the symmetry of point group 32 because its approximate threefold axes are almost normal. A possible relation between the three-dimensional structure of the protein and the linear sequence of its gene will be described. The topological threefold symmetry and orientation of each of the two observed globular domains may direct the binding of substrates and inhibitors by a helix macrodipole effect and implies that the active site is located near the interdomain crossover segments. The structure also suggests a rationale for the glyphosate tolerance conferred by sequence alterations.
About this Structure
1EPS is a Single protein structure of sequence from Escherichia coli. Active as Riboflavin synthase, with EC number 2.5.1.9 Full crystallographic information is available from OCA.
Reference
Structure and topological symmetry of the glyphosate target 5-enolpyruvylshikimate-3-phosphate synthase: a distinctive protein fold., Stallings WC, Abdel-Meguid SS, Lim LW, Shieh HS, Dayringer HE, Leimgruber NK, Stegeman RA, Anderson KS, Sikorski JA, Padgette SR, Kishore GM, Proc Natl Acad Sci U S A. 1991 Jun 1;88(11):5046-50. PMID:11607190
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