1isk
From Proteopedia
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| - | [[Image:1isk.gif|left|200px]]< | + | [[Image:1isk.gif|left|200px]] |
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| - | '''3-OXO-DELTA5-STEROID ISOMERASE, NMR, 20 STRUCTURES''' | + | {{Structure |
| + | |PDB= 1isk |SIZE=350|CAPTION= <scene name='initialview01'>1isk</scene> | ||
| + | |SITE= <scene name='pdbsite=SIA:TYR+A14+And+ASP+A99+Both+Stabilize+The+Intermediate+By+F+...'>SIA</scene> and <scene name='pdbsite=SIB:TYR+B14+And+ASP+B99+Both+Stabilize+The+Intermediate+By+F+...'>SIB</scene> | ||
| + | |LIGAND= | ||
| + | |ACTIVITY= [http://en.wikipedia.org/wiki/Steroid_Delta-isomerase Steroid Delta-isomerase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=5.3.3.1 5.3.3.1] | ||
| + | |GENE= | ||
| + | }} | ||
| + | |||
| + | '''3-OXO-DELTA5-STEROID ISOMERASE, NMR, 20 STRUCTURES''' | ||
| + | |||
==Overview== | ==Overview== | ||
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==About this Structure== | ==About this Structure== | ||
| - | 1ISK is a [ | + | 1ISK is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Comamonas_testosteroni Comamonas testosteroni]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1ISK OCA]. |
==Reference== | ==Reference== | ||
| - | Solution structure of 3-oxo-delta5-steroid isomerase., Wu ZR, Ebrahimian S, Zawrotny ME, Thornburg LD, Perez-Alvarado GC, Brothers P, Pollack RM, Summers MF, Science. 1997 Apr 18;276(5311):415-8. PMID:[http:// | + | Solution structure of 3-oxo-delta5-steroid isomerase., Wu ZR, Ebrahimian S, Zawrotny ME, Thornburg LD, Perez-Alvarado GC, Brothers P, Pollack RM, Summers MF, Science. 1997 Apr 18;276(5311):415-8. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/9103200 9103200] |
[[Category: Comamonas testosteroni]] | [[Category: Comamonas testosteroni]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
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[[Category: ksi]] | [[Category: ksi]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 11:54:20 2008'' |
Revision as of 09:54, 20 March 2008
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| Sites: | and | ||||||
| Activity: | Steroid Delta-isomerase, with EC number 5.3.3.1 | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
3-OXO-DELTA5-STEROID ISOMERASE, NMR, 20 STRUCTURES
Overview
The three-dimensional structure of the enzyme 3-oxo-delta5-steroid isomerase (E.C. 5.3.3.1), a 28-kilodalton symmetrical dimer, was solved by multidimensional heteronuclear magnetic resonance spectroscopy. The two independently folded monomers pack together by means of extensive hydrophobic and electrostatic interactions. Each monomer comprises three alpha helices and a six-strand mixed beta-pleated sheet arranged to form a deep hydrophobic cavity. Catalytically important residues Tyr14 (general acid) and Asp38 (general base) are located near the bottom of the cavity and positioned as expected from mechanistic hypotheses. An unexpected acid group (Asp99) is also located in the active site adjacent to Tyr14, and kinetic and binding studies of the Asp99 to Ala mutant demonstrate that Asp99 contributes to catalysis by stabilizing the intermediate.
About this Structure
1ISK is a Single protein structure of sequence from Comamonas testosteroni. Full crystallographic information is available from OCA.
Reference
Solution structure of 3-oxo-delta5-steroid isomerase., Wu ZR, Ebrahimian S, Zawrotny ME, Thornburg LD, Perez-Alvarado GC, Brothers P, Pollack RM, Summers MF, Science. 1997 Apr 18;276(5311):415-8. PMID:9103200
Page seeded by OCA on Thu Mar 20 11:54:20 2008
