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2hxc

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Revision as of 16:31, 10 September 2015

Crystal structure of the benzylamine complex of aromatic amine dehydrogenase in N-semiquinone form

Structural highlights

2hxc is a 4 chain structure with sequence from Alcaligenes faecalis. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:
NonStd Res:
Related:	2i0r, 2i0s, 2i0t
Activity:	Aralkylamine dehydrogenase (azurin), with EC number 1.4.9.2
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum

Function

[AAUA_ALCFA] Oxidizes primary aromatic amines and, more slowly, some long-chain aliphatic amines, but not methylamine or ethylamine. Uses azurin as an electron acceptor to transfer electrons from the reduced tryptophylquinone cofactor.^[1] ^[2] ^[3] ^[4] ^[5] ^[6] ^[7] [AAUB_ALCFA] Oxidizes primary aromatic amines and, more slowly, some long-chain aliphatic amines, but not methylamine or ethylamine. Uses azurin as an electron acceptor to transfer electrons from the reduced tryptophylquinone cofactor.^[8] ^[9] ^[10] ^[11]

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

The quinoprotein aromatic amine dehydrogenase (AADH) uses a covalently bound tryptophan tryptophylquinone (TTQ) cofactor to oxidatively deaminate primary aromatic amines. Recent crystal structures have provided insight into the reductive half-reaction. In contrast, no atomic details are available for the oxidative half-reaction. The TTQ O7 hydroxyl group is protonated during reduction, but it is unclear how this proton can be removed during the oxidative half-reaction. Furthermore, compared with the electron transfer from the N-quinol form, electron transfer from the non-physiological O-quinol form to azurin is significantly slower. Here we report crystal structures of the O-quinol, N-quinol, and N-semiquinone forms of AADH. A comparison of oxidized and substrate reduced AADH species reveals changes in the TTQ-containing subunit, extending from residues in the immediate vicinity of the N-quinol to the putative azurin docking site, suggesting a mechanism whereby TTQ redox state influences interprotein electron transfer. In contrast, chemical reduction of the TTQ center has no significant effect on protein conformation. Furthermore, structural reorganization upon substrate reduction places a water molecule near TTQ O7 where it can act as proton acceptor. The structure of the N-semiquinone, however, is essentially similar to oxidized AADH. Surprisingly, in the presence of substrate a covalent N-semiquinone substrate adduct is observed. To our knowledge this is the first detailed insight into a complex, branching mechanism of quinone oxidation where significant structural reorganization upon reduction of the quinone center directly influences formation of the electron transfer complex and nature of the electron transfer process.

Atomic level insight into the oxidative half-reaction of aromatic amine dehydrogenase.,Roujeinikova A, Scrutton NS, Leys D J Biol Chem. 2006 Dec 29;281(52):40264-72. Epub 2006 Sep 27. PMID:17005560^[12]

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

References

↑ Chistoserdov AY. Cloning, sequencing and mutagenesis of the genes for aromatic amine dehydrogenase from Alcaligenes faecalis and evolution of amine dehydrogenases. Microbiology. 2001 Aug;147(Pt 8):2195-202. PMID:11495996
↑ Hothi P, Khadra KA, Combe JP, Leys D, Scrutton NS. Tryptophan tryptophylquinone cofactor biogenesis in the aromatic amine dehydrogenase of Alcaligenes faecalis. Cofactor assembly and catalytic properties of recombinant enzyme expressed in Paracoccus denitrificans. FEBS J. 2005 Nov;272(22):5894-909. PMID:16279953 doi:http://dx.doi.org/EJB4990
↑ Govindaraj S, Eisenstein E, Jones LH, Sanders-Loehr J, Chistoserdov AY, Davidson VL, Edwards SL. Aromatic amine dehydrogenase, a second tryptophan tryptophylquinone enzyme. J Bacteriol. 1994 May;176(10):2922-9. PMID:8188594
↑ Edwards SL, Davidson VL, Hyun YL, Wingfield PT. Spectroscopic evidence for a common electron transfer pathway for two tryptophan tryptophylquinone enzymes. J Biol Chem. 1995 Mar 3;270(9):4293-8. PMID:7876189
↑ Sukumar N, Chen ZW, Ferrari D, Merli A, Rossi GL, Bellamy HD, Chistoserdov A, Davidson VL, Mathews FS. Crystal structure of an electron transfer complex between aromatic amine dehydrogenase and azurin from Alcaligenes faecalis. Biochemistry. 2006 Nov 14;45(45):13500-10. PMID:17087503 doi:http://dx.doi.org/10.1021/bi0612972
↑ Roujeinikova A, Scrutton NS, Leys D. Atomic level insight into the oxidative half-reaction of aromatic amine dehydrogenase. J Biol Chem. 2006 Dec 29;281(52):40264-72. Epub 2006 Sep 27. PMID:17005560 doi:http://dx.doi.org/10.1074/jbc.M605559200
↑ Masgrau L, Roujeinikova A, Johannissen LO, Hothi P, Basran J, Ranaghan KE, Mulholland AJ, Sutcliffe MJ, Scrutton NS, Leys D. Atomic description of an enzyme reaction dominated by proton tunneling. Science. 2006 Apr 14;312(5771):237-41. PMID:16614214 doi:312/5771/237
↑ Chistoserdov AY. Cloning, sequencing and mutagenesis of the genes for aromatic amine dehydrogenase from Alcaligenes faecalis and evolution of amine dehydrogenases. Microbiology. 2001 Aug;147(Pt 8):2195-202. PMID:11495996
↑ Hothi P, Khadra KA, Combe JP, Leys D, Scrutton NS. Tryptophan tryptophylquinone cofactor biogenesis in the aromatic amine dehydrogenase of Alcaligenes faecalis. Cofactor assembly and catalytic properties of recombinant enzyme expressed in Paracoccus denitrificans. FEBS J. 2005 Nov;272(22):5894-909. PMID:16279953 doi:http://dx.doi.org/EJB4990
↑ Govindaraj S, Eisenstein E, Jones LH, Sanders-Loehr J, Chistoserdov AY, Davidson VL, Edwards SL. Aromatic amine dehydrogenase, a second tryptophan tryptophylquinone enzyme. J Bacteriol. 1994 May;176(10):2922-9. PMID:8188594
↑ Masgrau L, Roujeinikova A, Johannissen LO, Hothi P, Basran J, Ranaghan KE, Mulholland AJ, Sutcliffe MJ, Scrutton NS, Leys D. Atomic description of an enzyme reaction dominated by proton tunneling. Science. 2006 Apr 14;312(5771):237-41. PMID:16614214 doi:312/5771/237
↑ Roujeinikova A, Scrutton NS, Leys D. Atomic level insight into the oxidative half-reaction of aromatic amine dehydrogenase. J Biol Chem. 2006 Dec 29;281(52):40264-72. Epub 2006 Sep 27. PMID:17005560 doi:http://dx.doi.org/10.1074/jbc.M605559200

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/2hxc"

Categories: Alcaligenes faecalis | Leys, D | Roujeinikova, A | Oxidoreductase | Semiquinone

@@ Line 6: / Line 6: @@
 <tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=TTQ:6-AMINO-7-HYDROXY-L-TRYPTOPHAN'>TTQ</scene></td></tr>
 <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[2i0r|2i0r]], [[2i0s|2i0s]], [[2i0t|2i0t]]</td></tr>
-<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Aralkylamine_dehydrogenase Aralkylamine dehydrogenase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.4.99.4 1.4.99.4] </span></td></tr>
+<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Aralkylamine_dehydrogenase_(azurin) Aralkylamine dehydrogenase (azurin)], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.4.9.2 1.4.9.2] </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=2hxc FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2hxc OCA], [http://www.rcsb.org/pdb/explore.do?structureId=2hxc RCSB], [http://www.ebi.ac.uk/pdbsum/2hxc 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=2hxc FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2hxc OCA], [http://pdbe.org/2hxc PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2hxc RCSB], [http://www.ebi.ac.uk/pdbsum/2hxc PDBsum]</span></td></tr>
 </table>
 == Function ==
@@ Line 29: / Line 29: @@
 From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
 </div>
+<div class="pdbe-citations 2hxc" style="background-color:#fffaf0;"></div>
 ==See Also==
@@ Line 37: / Line 38: @@
 </StructureSection>
 [[Category: Alcaligenes faecalis]]
-[[Category: Aralkylamine dehydrogenase]]
 [[Category: Leys, D]]
 [[Category: Roujeinikova, A]]
 [[Category: Oxidoreductase]]
 [[Category: Semiquinone]]

2hxc

From Proteopedia

Revision as of 16:31, 10 September 2015

Crystal structure of the benzylamine complex of aromatic amine dehydrogenase in N-semiquinone form

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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