Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report | Ligand Interaction

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

Biological assembly 1 generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 119.61 kDa 
• Atom Count: 8779 
• Modelled Residue Count: 993 
• Deposited Residue Count: 1040 
• Unique protein chains: 1

2BK5

Human Monoamine Oxidase B: I199F mutant in complex with isatin

• PDB DOI: 10.2210/pdb2BK5/pdb

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


• Deposited: 2005-02-10 Released: 2005-02-14 
• Deposition Author(s): Binda, C., Edmondson, D.E., Mattevi, A., Hubalek, F., Khalil, A., Li, M., Castagnoli, N.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.83 Å
• R-Value Free: 0.206 
• R-Value Work: 0.185 
• R-Value Observed: 0.186 

Literature

Demonstration of Isoleucine 199 as a Structural Determinant for the Selective Inhibition of Human Monoamine Oxidase B by Specific Reversible Inhibitors.

Hubalek, F., Binda, C., Khalil, A., Li, M., Mattevi, A., Castagnoli, N., Edmondson, D.E.

(2005) J Biol Chem 280: 15761

• PubMed: 15710600 
• DOI: 10.1074/jbc.M500949200
• Primary Citation of Related Structures:  
  2BK3, 2BK4, 2BK5


• PubMed Abstract: 
  

Several reversible inhibitors selective for human monoamine oxidase B (MAO B) that do not inhibit MAO A have been described in the literature. The following compounds: 8-(3-chlorostyryl)caffeine, 1,4-diphenyl-2-butene, and trans,trans-farnesol are shown to inhibit competitively human, horse, rat, and mouse MAO B with K(i) values in the low micromolar range but are without effect on either bovine or sheep MAO B or human MAO A. In contrast, the reversible competitive inhibitor isatin binds to all known MAO B and MAO A with similar affinities. Sequence alignments and the crystal structures of human MAO B in complex with 1,4-diphenyl-2-butene or with trans,trans-farnesol provide molecular insights into these specificities. These inhibitors span the substrate and entrance cavities with the side chain of Ile-199 rotated out of its normal conformation suggesting that Ile-199 is gating the substrate cavity. Ile-199 is conserved in all known MAO B sequences except bovine MAO B, which has Phe in this position (the sequence of sheep MAO B is unknown). Phe is conserved in the analogous position in MAO A sequences. The human MAO B I199F mutant protein of MAO B binds to isatin (K(i) = 3 microM) but not to the three inhibitors listed above. The crystal structure of this mutant demonstrates that the side chain of Phe-199 interferes with the binding of those compounds. This suggests that the Ile-199 "gate" is a determinant for the specificity of these MAO B inhibitors and provides a molecular basis for the development of MAO B-specific reversible inhibitors without interference with MAO A function in neurotransmitter metabolism.

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Organizational Affiliation: 

Department of Biochemistry, Emory University, Atlanta, Georgia 30322, USA.

Macromolecules

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

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
FAD	C [auth A], E [auth B]	FLAVIN-ADENINE DINUCLEOTIDE C27 H33 N9 O15 P2 VWWQXMAJTJZDQX-UYBVJOGSSA-N
ISN	D [auth A], F [auth B]	ISATIN C8 H5 N O2 JXDYKVIHCLTXOP-UHFFFAOYSA-N

Binding Affinity Annotations
ID	Source	Binding Affinity
ISN	BindingDB:  2BK5	Ki: min: 33, max: 6000 (nM) from 6 assay(s)
		IC50: min: 7943, max: 3.68e+5 (nM) from 7 assay(s)
	Binding MOAD:  2BK5	Ki: 3000 (nM) from 1 assay(s)

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.83 Å
• R-Value Free: 0.206 
• R-Value Work: 0.185 
• R-Value Observed: 0.186 
• Space Group: C 2 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 130.843	α = 90
b = 221.99	β = 90
c = 86.072	γ = 90

Software Package:

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

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2005-02-10 
• Released Date: 2005-02-14 
Deposition Author(s): Binda, C., Edmondson, D.E., Mattevi, A., Hubalek, F., Khalil, A., Li, M., Castagnoli, N.

Revision History  

• Version 1.0: 2005-02-14
  Type: Initial release
  
• Version 1.1: 2011-08-10
  Changes: Atomic model, Database references, Derived calculations, Non-polymer description, Other, Structure summary, Version format compliance