2AGL image
Entry Detail
PDB ID:
2AGL
Keywords:
Title:
Crystal structure of the phenylhydrazine adduct of aromatic amine dehydrogenase from Alcaligenes faecalis
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2005-07-27
Release Date:
2006-04-25
Method Details:
Experimental Method:
Resolution:
1.40 Å
R-Value Free:
0.19
R-Value Work:
0.17
R-Value Observed:
0.17
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Aromatic amine dehydrogenase
Chain IDs:C (auth: A), D (auth: B)
Chain Length:361
Number of Molecules:2
Biological Source:Alcaligenes faecalis
Polymer Type:polypeptide(L)
Description:Aromatic amine dehydrogenase
Chain IDs:A (auth: D), B (auth: H)
Chain Length:135
Number of Molecules:2
Biological Source:Alcaligenes faecalis
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
TRQ A TRP ?
Ligand Molecules
Primary Citation
Atomic description of an enzyme reaction dominated by proton tunneling
Science 312 237 241 (2006)
PMID: 16614214 DOI: 10.1126/science.1126002

Abstact

We present an atomic-level description of the reaction chemistry of an enzyme-catalyzed reaction dominated by proton tunneling. By solving structures of reaction intermediates at near-atomic resolution, we have identified the reaction pathway for tryptamine oxidation by aromatic amine dehydrogenase. Combining experiment and computer simulation, we show proton transfer occurs predominantly to oxygen O2 of Asp(128)beta in a reaction dominated by tunneling over approximately 0.6 angstroms. The role of long-range coupled motions in promoting tunneling is controversial. We show that, in this enzyme system, tunneling is promoted by a short-range motion modulating proton-acceptor distance and no long-range coupled motion is required.

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Primary Citation of related structures