2ZSC

Tamavidin2, Novel Avidin-like Biotin-Binding Proteins from an Edible Mushroom


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.30 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.199 
  • R-Value Observed: 0.201 

Starting Model: experimental
View more details

wwPDB Validation   3D Report Full Report


Ligand Structure Quality Assessment 


This is version 1.2 of the entry. See complete history


Literature

Tamavidins--novel avidin-like biotin-binding proteins from the Tamogitake mushroom

Takakura, Y.Tsunashima, M.Suzuki, J.Usami, S.Kakuta, Y.Okino, N.Ito, M.Yamamoto, T.

(2009) FEBS J 276: 1383-1397

  • DOI: https://doi.org/10.1111/j.1742-4658.2009.06879.x
  • Primary Citation of Related Structures:  
    2ZSC

  • PubMed Abstract: 

    Novel biotin-binding proteins, referred to herein as tamavidin 1 and tamavidin 2, were found in a basidiomycete fungus, Pleurotus cornucopiae, known as the Tamogitake mushroom. These are the first avidin-like proteins to be discovered in organisms other than birds and bacteria. Tamavidin 1 and tamavidin 2 have amino acid sequences with 31% and 36% identity, respectively, to avidin, and 47% and 48% identity, respectively, to streptavidin. Unlike any other biotin-binding proteins, tamavidin 1 and tamavidin 2 are expressed as soluble proteins at a high level in Escherichia coli. Recombinant tamavidin 2 was purified as a tetrameric protein in a single step by 2-iminobiotin affinity chromatography, with a yield of 5 mg per 100 mL culture of E. coli. The kinetic parameters measured by a BIAcore biosensor indicated that recombinant tamavidin 2 binds biotin with high affinity, in a similar manner to binding by avidin and streptavidin. The overall crystal structure of recombinant tamavidin 2 is similar to that of avidin and streptavidin. However, recombinant tamavidin 2 is immunologically distinct from avidin and streptavidin. Tamavidin 2 and streptavidin are very similar in terms of the arrangement of the residues interacting with biotin, but different with regard to the number of hydrogen bonds to biotin carboxylate. Recombinant tamavidin 2 is more stable than avidin and streptavidin at high temperature, and nonspecific binding to DNA and human serum by recombinant tamavidin 2 is lower than that for avidin. These findings highlight tamavidin 2 as a probable powerful tool, in addition to avidin and streptavidin, in numerous applications of biotin-binding proteins.


  • Organizational Affiliation

    Plant Innovation Center, Japan Tobacco, Inc., Iwata, Shizuoka, Japan. yoshimitsu.takakura@ims.jti.co.jp


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Tamavidin2
A, B
141Pleurotus cornucopiaeMutation(s): 0 
UniProt
Find proteins for B9A0T7 (Pleurotus cornucopiae)
Explore B9A0T7 
Go to UniProtKB:  B9A0T7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupB9A0T7
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
BTN
Query on BTN

Download Ideal Coordinates CCD File 
G [auth A],
O [auth B]
BIOTIN
C10 H16 N2 O3 S
YBJHBAHKTGYVGT-ZKWXMUAHSA-N
GOL
Query on GOL

Download Ideal Coordinates CCD File 
C [auth A]
D [auth A]
E [auth A]
F [auth A]
I [auth B]
C [auth A],
D [auth A],
E [auth A],
F [auth A],
I [auth B],
J [auth B],
K [auth B],
L [auth B],
M [auth B]
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
MG
Query on MG

Download Ideal Coordinates CCD File 
H [auth A],
N [auth B],
P [auth B]
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
Binding Affinity Annotations 
IDSourceBinding Affinity
BTN PDBBind:  2ZSC Kd: 87 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.30 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.199 
  • R-Value Observed: 0.201 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 78.382α = 90
b = 80.017β = 132.32
c = 55.733γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling
MOLREPphasing

Structure Validation

View Full Validation Report



Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-02-17
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 1.2: 2023-11-01
    Changes: Data collection, Database references, Derived calculations, Refinement description