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3rna

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Revision as of 13:17, 11 August 2016

Structure of the Toluene/o-Xylene Monooxygenase Hydroxylase T201S/I100W Double Mutant

Structural highlights

3rna is a 3 chain structure with sequence from Pseudomonas sp. ox1. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:	,
Related:	3rn9, 3rnb, 3rnc, 3rne, 3rnf, 3rng
Gene:	touA (Pseudomonas sp. OX1), touE (Pseudomonas sp. OX1), touB (Pseudomonas sp. OX1)
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Publication Abstract from PubMed

For numerous enzymes reactive toward small gaseous compounds, growing evidence indicates that these substrates diffuse into active site pockets through defined pathways in the protein matrix. Toluene/o-xylene monooxygenase hydroxylase is a dioxygen-activating enzyme. Structural analysis suggests two possible pathways for dioxygen access through the alpha-subunit to the diiron center: a channel or a series of hydrophobic cavities. To distinguish which is utilized as the O(2) migration pathway, the dimensions of the cavities and the channel were independently varied by site-directed mutagenesis and confirmed by X-ray crystallography. The rate constants for dioxygen access to the diiron center were derived from the formation rates of a peroxodiiron(III) intermediate, generated upon treatment of the diiron(II) enzyme with O(2). This reaction depends on the concentration of dioxygen to the first order. Altering the dimensions of the cavities, but not the channel, changed the rate of dioxygen reactivity with the enzyme. These results strongly suggest that voids comprising the cavities in toluene/o-xylene monooxygenase hydroxylase are not artifacts of protein packing/folding, but rather programmed routes for dioxygen migration through the protein matrix. Because the cavities are not fully connected into the diiron active center in the enzyme resting state, conformational changes will be required to facilitate dioxygen access to the diiron center. We propose that such temporary opening and closing of the cavities may occur in all bacterial multicomponent monooxygenases to control O(2) consumption for efficient catalysis. Our findings suggest that other gas-utilizing enzymes may employ similar structural features to effect substrate passage through a protein matrix.

Tracking a defined route for O2 migration in a dioxygen-activating diiron enzyme.,Song WJ, Gucinski G, Sazinsky MH, Lippard SJ Proc Natl Acad Sci U S A. 2011 Aug 22. PMID:21859951^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Song WJ, Gucinski G, Sazinsky MH, Lippard SJ. Tracking a defined route for O2 migration in a dioxygen-activating diiron enzyme. Proc Natl Acad Sci U S A. 2011 Aug 22. PMID:21859951 doi:10.1073/pnas.1106514108

1 Structural highlights
2 Publication Abstract from PubMed
3 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/3rna"

@@ Line 1: / Line 1: @@
 ==Structure of the Toluene/o-Xylene Monooxygenase Hydroxylase T201S/I100W Double Mutant==
 <StructureSection load='3rna' size='340' side='right' caption='[[3rna]], [[Resolution|resolution]] 3.00&Aring;' scene=''>
@@ Line 6: / Line 7: @@
 <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[3rn9|3rn9]], [[3rnb|3rnb]], [[3rnc|3rnc]], [[3rne|3rne]], [[3rnf|3rnf]], [[3rng|3rng]]</td></tr>
 <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">touA ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=320855 Pseudomonas sp. OX1]), touE ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=320855 Pseudomonas sp. OX1]), touB ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=320855 Pseudomonas sp. OX1])</td></tr>
-<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3rna FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3rna OCA], [http://www.rcsb.org/pdb/explore.do?structureId=3rna RCSB], [http://www.ebi.ac.uk/pdbsum/3rna PDBsum]</span></td></tr>
+<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3rna FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3rna OCA], [http://pdbe.org/3rna PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=3rna RCSB], [http://www.ebi.ac.uk/pdbsum/3rna PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=3rna ProSAT]</span></td></tr>
 </table>
 <div style="background-color:#fffaf0;">
@@ Line 16: / Line 17: @@
 From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
 </div>
+<div class="pdbe-citations 3rna" style="background-color:#fffaf0;"></div>
 == References ==
 <references/>

3rna

From Proteopedia

Revision as of 13:17, 11 August 2016

Structure of the Toluene/o-Xylene Monooxygenase Hydroxylase T201S/I100W Double Mutant

Structural highlights

Publication Abstract from PubMed

References

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