Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PQS (software)

Macromolecule Content

• Total Structure Weight: 119.56 kDa 
• Atom Count: 8356 
• Residue Count: 993 
• Unique protein chains: 1

2C73

Functional Role of the Aromatic Cage in Human Monoamine Oxidase B: Structures and Catalytic Properties of Tyr435 Mutant Proteins

• DOI: 10.2210/pdb2C73/pdb

• Classification: OXIDOREDUCTASE
• Organism(s): Homo sapiens
• Expression System: Komagataella pastoris
• Mutation(s): Yes 


• Deposited: 2005-11-17 Released: 2006-04-19 
• Deposition Author(s): Li, M., Binda, C., Mattevi, A., Edmondson, D.E.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.20 Å
• R-Value Free: 0.279 
• R-Value Work: 0.235 
• R-Value Observed: 0.236 

Literature

Functional Role of the Aromatic Cage in Human Monoamine Oxidase B: Structures and Catalytic Properties of Tyr435 Mutant Proteins

Li, M., Binda, C., Mattevi, A., Edmondson, D.E.

(2006) Biochemistry 45: 4775

• PubMed: 16605246 
• DOI: 10.1021/bi051847g
• Structures With Same Primary Citation


• PubMed Abstract: 
  

Current structural results of several flavin-dependent amine oxidizing enzymes including human monoamine oxidases A and B (MAO A and MAO B) show aromatic amino acid residues oriented approximately perpendicular to the flavin ring, suggesting a functional role in catalysis. In the case of human MAO B, two tyrosyl residues (Y398 and Y435) are found in the substrate binding site on the re face of the covalent flavin ring [Binda et al. (2002) J. Biol. Chem. 277, 23973-23976]. To probe the functional significance of this structure, Tyr435 in MAO B was mutated with the amino acids Phe, His, Leu, or Trp, the mutant proteins expressed in Pichia pastoris, and purified to homogeneity. Each mutant protein contains covalent FAD and exhibits a high level of catalytic functionality. No major alterations in active site structures are detected on comparison of their respective crystal structures with that of WT enzyme. The relative k(cat)/K(m) values for each mutant enzyme show Y435 > Y435F = Y435L = Y435H > Y435W. A similar behavior is also observed with the membrane-bound forms of MAO A and MAO B (MAO A Y444 mutant enzymes are found to be unstable on membrane extraction). p-Nitrobenzylamine is found to be a poor substrate while p-nitrophenethylamine is found to be a good substrate for all WT and mutant forms of MAO B. Analysis of these kinetic and structural data suggests the function of the "aromatic cage" in MAO to include a steric role in substrate binding and access to the flavin coenzyme and to increase the nucleophilicity of the substrate amine moiety. These results are consistent with a proposed polar nucleophilic mechanism for catalytic amine oxidation.

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Organizational Affiliation: 

Department of Biochemistry, Emory University, 1510 Clifton Road, Atlanta, Georgia 30322, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
AMINE OXIDASE (FLAVIN-CONTAINING) B	A, B	520	Homo sapiens	Mutation(s): 1  Gene Names: MAOB EC: 1.4.3.4
Find proteins for P27338 (Homo sapiens) Explore P27338  Go to UniProtKB:  P27338
NIH Common Fund Data Resources
PHAROS  P27338 GTEx  ENSG00000069535

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
FAD	A, B	FLAVIN-ADENINE DINUCLEOTIDE C27 H33 N9 O15 P2 VWWQXMAJTJZDQX-UYBVJOGSSA-N
RSA	A, B	N-PROPARGYL-1(S)-AMINOINDAN C12 H13 N RUOKEQAAGRXIBM-LBPRGKRZSA-N

External Ligand Annotations
ID	Binding Affinity (Sequence Identity %)
RSA	Ki:  127000   nM  BindingDB

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.20 Å
• R-Value Free: 0.279 
• R-Value Work: 0.235 
• R-Value Observed: 0.236 
• Space Group: C 2 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 140.007	α = 90
b = 222.308	β = 90
c = 86.611	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
MOSFLM	data reduction
SCALA	data scaling
AMoRE	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2005-11-17 
• Released Date: 2006-04-19 
Deposition Author(s): Li, M., Binda, C., Mattevi, A., Edmondson, D.E.

Revision History 

• Version 1.0: 2006-04-19
  Type: Initial release
  
• Version 1.1: 2011-05-08
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance