Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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

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

Macromolecule Content

• Total Structure Weight: 67125.80 
• Atom Count: 4729 
• Residue Count: 574 
• Unique protein chains: 1

5I3B

Crystal Structure of tyrosinase from Bacillus megaterium with configuration B of hydroquinone inhibitor in the active site

• DOI: 10.2210/pdb5I3B/pdb

• Classification: OXIDOREDUCTASE
• Organism(s): Bacillus megaterium
• Expression System: Escherichia coli BL21(DE3)


• Deposited: 2016-02-10 Released: 2016-10-12 
• Deposition Author(s): Kanteev, M., Deri, B., Adir, N., Fishman, A.
• Funding Organization(s): ISF 

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.2 Å
• R-Value Free: 0.217 
• R-Value Work: 0.186 

Literature

The unravelling of the complex pattern of tyrosinase inhibition.

Deri, B., Kanteev, M., Goldfeder, M., Lecina, D., Guallar, V., Adir, N., Fishman, A.

(2016) Sci Rep 6: 34993-34993

• PubMed: 27725765 
• DOI: 10.1038/srep34993
• Primary Citation of Related Structures:  
  5I3A, 5I38


• PubMed Abstract: 
  

Tyrosinases are responsible for melanin formation in all life domains. Tyrosinase inhibitors are used for the prevention of severe skin diseases, in skin-whitening creams and to avoid fruit browning, however continued use of many such inhibitors is considered unsafe. In this study we provide conclusive evidence of the inhibition mechanism of two well studied tyrosinase inhibitors, KA (kojic acid) and HQ (hydroquinone), which are extensively used in hyperpigmentation treatment. KA is reported in the literature with contradicting inhibition mechanisms, while HQ is described as both a tyrosinase inhibitor and a substrate. By visualization of KA and HQ in the active site of TyrBm crystals, together with molecular modeling, binding constant analysis and kinetic experiments, we have elucidated their mechanisms of inhibition, which was ambiguous for both inhibitors. We confirm that while KA acts as a mixed inhibitor, HQ can act both as a TyrBm substrate and as an inhibitor.

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Organizational Affiliation: 

Department of Biotechnology and Food Engineering, Technion-Israel Institute of Technology, Haifa, 3200003, Israel.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Tyrosinase	A, B	287	Bacillus megaterium	Mutation(s): 0
Find proteins for B2ZB02 (Bacillus megaterium) Go to UniProtKB:  B2ZB02

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
ZN	A, B	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N
HQE	A, B	benzene-1,4-diol C6 H6 O2 QIGBRXMKCJKVMJ-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.2 Å
• R-Value Free: 0.217 
• R-Value Work: 0.186 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length (Å)	Angle (°)
a = 69.620	α = 90.00
b = 74.420	β = 90.00
c = 119.690	γ = 90.00

Software Package:

Software Name	Purpose
PHENIX	refinement
PDB_EXTRACT	data extraction
SCALA	data scaling
PHASER	phasing
MOSFLM	data reduction

Structure Validation

Entry History & Funding Information

Deposition Data

• Deposited Date: 2016-02-10 
• Released Date: 2016-10-12 
• Deposition Author(s): Kanteev, M., Deri, B., Adir, N., Fishman, A.

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Funding Organization	Location	Grant Number
ISF	Israel	419/15

Revision History 

• Version 1.0: 2016-10-12
  Type: Initial release
• Version 1.1: 2016-10-19
  Type: Database references