1yj4: Difference between revisions
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[[Image:1yj4.gif|left|200px]] | [[Image:1yj4.gif|left|200px]] | ||
'''Y305F Trichodiene Synthase''' | {{Structure | ||
|PDB= 1yj4 |SIZE=350|CAPTION= <scene name='initialview01'>1yj4</scene>, resolution 2.3Å | |||
|SITE= | |||
|LIGAND= <scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</scene> | |||
|ACTIVITY= [http://en.wikipedia.org/wiki/Trichodiene_synthase Trichodiene synthase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=4.2.3.6 4.2.3.6] | |||
|GENE= TRI5 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=5514 Fusarium sporotrichioides]) | |||
}} | |||
'''Y305F Trichodiene Synthase''' | |||
==Overview== | ==Overview== | ||
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==About this Structure== | ==About this Structure== | ||
1YJ4 is a [ | 1YJ4 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Fusarium_sporotrichioides Fusarium sporotrichioides]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1YJ4 OCA]. | ||
==Reference== | ==Reference== | ||
Molecular recognition of the substrate diphosphate group governs product diversity in trichodiene synthase mutants., Vedula LS, Rynkiewicz MJ, Pyun HJ, Coates RM, Cane DE, Christianson DW, Biochemistry. 2005 Apr 26;44(16):6153-63. PMID:[http:// | Molecular recognition of the substrate diphosphate group governs product diversity in trichodiene synthase mutants., Vedula LS, Rynkiewicz MJ, Pyun HJ, Coates RM, Cane DE, Christianson DW, Biochemistry. 2005 Apr 26;44(16):6153-63. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/15835903 15835903] | ||
[[Category: Fusarium sporotrichioides]] | [[Category: Fusarium sporotrichioides]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
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[[Category: terpenoid cyclase fold]] | [[Category: terpenoid cyclase fold]] | ||
''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 15:23:30 2008'' | ||
Revision as of 16:23, 20 March 2008
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| , resolution 2.3Å | |||||||
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| Ligands: | |||||||
| Gene: | TRI5 (Fusarium sporotrichioides) | ||||||
| Activity: | Trichodiene synthase, with EC number 4.2.3.6 | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
Y305F Trichodiene Synthase
OverviewOverview
The X-ray crystal structures of Y305F trichodiene synthase and its complex with coproduct inorganic pyrophosphate (PP(i)) and of Y305F and D100E trichodiene synthases in ternary complexes with PP(i) and aza analogues of the bisabolyl carbocation intermediate are reported. The Y305F substitution in the basic D(302)RRYR motif does not cause large changes in the overall structure in comparison with the wild-type enzyme in either the uncomplexed enzyme or its complex with PP(i). However, the loss of the Y305F-PP(i) hydrogen bond appears to be compensated by a very slight shift in the position of the side chain of R304. The putative bisabolyl carbocation mimic, R-azabisabolene, binds in a conformation and orientation that does not appear to mimic that of the actual carbocation intermediate, suggesting that the avid inhibition by R- and S-azabisabolenes arises more from favorable electrostatic interactions with PP(i) rather than any special resemblance to a reaction intermediate. Greater enclosed active-site volumes result from the Y305F and D100E mutations that appear to confer greater variability in ligand-binding conformations and orientations, which results in the formation of aberrant cyclization products. Because the binding conformations and orientations of R-azabisabolene to Y305F and D100E trichodiene synthases do not correspond to binding conformations required for product formation and because the binding conformations and orientations of diverse substrate and carbocation analogues to other cyclases such as 5-epi-aristolochene synthase and bornyl diphosphate synthase generally do not correspond to catalytically productive complexes, we conclude that the formation of transient carbocation intermediates in terpene cyclization reactions is generally under kinetic rather than thermodynamic control.
About this StructureAbout this Structure
1YJ4 is a Single protein structure of sequence from Fusarium sporotrichioides. Full crystallographic information is available from OCA.
ReferenceReference
Molecular recognition of the substrate diphosphate group governs product diversity in trichodiene synthase mutants., Vedula LS, Rynkiewicz MJ, Pyun HJ, Coates RM, Cane DE, Christianson DW, Biochemistry. 2005 Apr 26;44(16):6153-63. PMID:15835903
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