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3i63

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Revision as of 23:07, 24 December 2014

Peroxide Bound Toluene 4-Monooxygenase

Structural highlights

3i63 is a 4 chain structure with sequence from Pseudomonas mendocina. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:	,
Related:	3i5j
Gene:	tmoA (Pseudomonas mendocina), tmoE (Pseudomonas mendocina), tmoB (Pseudomonas mendocina), tmoD (Pseudomonas mendocina)
Resources:	FirstGlance, OCA, RCSB, PDBsum

Function

[TMOD_PSEME] Effector protein subunit of the multicomponent enzyme toluene-4-monooxygenase that hydroxylates toluene to form p-cresol. Required for optimal efficiency and specificity of the holoenzyme.^[1] ^[2] ^[3] [TMOB_PSEME] Subunit T4moB of the multicomponent enzyme toluene-4-monooxygenase that hydroxylates toluene to form p-cresol.^[4] ^[5] [TMOE_PSEME] Subunit of the multicomponent enzyme toluene-4-monooxygenase that hydroxylates toluene to form p-cresol.

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

Publication Abstract from PubMed

A diiron hydroxylase reaction typically begins by combination of O2 with a diferrous center to form reactive intermediates capable of hydrocarbon hydroxylation. In this natural cycle, reducing equivalents are provided by specific interactions with electron transfer proteins. The biological process can be bypassed by combining H2O2 with a diferric center, i.e., peroxide-shunt catalysis. Here we show that toluene 4-monooxygenase has a peroxide-shunt reaction that is approximately 600-fold slower than catalysis driven by biological electron transfer. However, the toluene 4-monooxygenase hydroxylase-effector protein complex was stable in the presence of 300 mM H2O2, suggesting overall benign effects of the exogenous oxidant on active site structure and function. The X-ray structure of the toluene 4-monooxygenase hydroxylase-effector protein complex determined from crystals soaked in H2O2 revealed a bound diatomic molecule, assigned to a cis-mu-1,2-peroxo bridge. This peroxo species resides in an active site position adjacent to the hydrogen-bonding substructure established by effector protein binding and faces into the distal cavity where substrate must bind during regiospecific aromatic ring hydroxylation catalysis. These results provide a new structural benchmark for how activated intermediates may be formed and dispatched during diiron hydroxylase catalysis.

Crystallographic and catalytic studies of the peroxide-shunt reaction in a diiron hydroxylase.,Bailey LJ, Fox BG Biochemistry. 2009 Sep 29;48(38):8932-9. PMID:19705873^[6]

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

References

↑ Hemmi H, Studts JM, Chae YK, Song J, Markley JL, Fox BG. Solution structure of the toluene 4-monooxygenase effector protein (T4moD). Biochemistry. 2001 Mar 27;40(12):3512-24. PMID:11297417
↑ Lountos GT, Mitchell KH, Studts JM, Fox BG, Orville AM. Crystal structures and functional studies of T4moD, the toluene 4-monooxygenase catalytic effector protein. Biochemistry. 2005 May 17;44(19):7131-42. PMID:15882052 doi:10.1021/bi047459g
↑ Bailey LJ, McCoy JG, Phillips GN Jr, Fox BG. Structural consequences of effector protein complex formation in a diiron hydroxylase. Proc Natl Acad Sci U S A. 2008 Dec 9;105(49):19194-8. Epub 2008 Nov 25. PMID:19033467
↑ Elsen NL, Bailey LJ, Hauser AD, Fox BG. Role for threonine 201 in the catalytic cycle of the soluble diiron hydroxylase toluene 4-monooxygenase. Biochemistry. 2009 May 12;48(18):3838-46. PMID:19290655 doi:10.1021/bi900144a
↑ Bailey LJ, Fox BG. Crystallographic and catalytic studies of the peroxide-shunt reaction in a diiron hydroxylase. Biochemistry. 2009 Sep 29;48(38):8932-9. PMID:19705873 doi:10.1021/bi901150a
↑ Bailey LJ, Fox BG. Crystallographic and catalytic studies of the peroxide-shunt reaction in a diiron hydroxylase. Biochemistry. 2009 Sep 29;48(38):8932-9. PMID:19705873 doi:10.1021/bi901150a

1 Structural highlights
2 Function
3 Evolutionary Conservation
4 Publication Abstract from PubMed
5 See Also
6 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/3i63"

@@ Line 8: / Line 8: @@
 <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=3i63 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3i63 OCA], [http://www.rcsb.org/pdb/explore.do?structureId=3i63 RCSB], [http://www.ebi.ac.uk/pdbsum/3i63 PDBsum]</span></td></tr>
 </table>
+== Function ==
+[[http://www.uniprot.org/uniprot/TMOD_PSEME TMOD_PSEME]] Effector protein subunit of the multicomponent enzyme toluene-4-monooxygenase that hydroxylates toluene to form p-cresol. Required for optimal efficiency and specificity of the holoenzyme.<ref>PMID:11297417</ref> <ref>PMID:15882052</ref> <ref>PMID:19033467</ref>  [[http://www.uniprot.org/uniprot/TMOB_PSEME TMOB_PSEME]] Subunit T4moB of the multicomponent enzyme toluene-4-monooxygenase that hydroxylates toluene to form p-cresol.<ref>PMID:19290655</ref> <ref>PMID:19705873</ref>  [[http://www.uniprot.org/uniprot/TMOE_PSEME TMOE_PSEME]] Subunit of the multicomponent enzyme toluene-4-monooxygenase that hydroxylates toluene to form p-cresol.
 == Evolutionary Conservation ==
 [[Image:Consurf_key_small.gif|200px|right]]

3i63

From Proteopedia

Revision as of 23:07, 24 December 2014

Peroxide Bound Toluene 4-Monooxygenase

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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