5MRA

human SCBD (sorcin calcium binding domain) in complex with doxorubicin


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.74 Å
  • R-Value Free: 0.285 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.196 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.1 of the entry. See complete history


Literature

Binding of doxorubicin to Sorcin impairs cell death and increases drug resistance in cancer cells.

Genovese, I.Fiorillo, A.Ilari, A.Masciarelli, S.Fazi, F.Colotti, G.

(2017) Cell Death Dis 8: e2950-e2950

  • DOI: https://doi.org/10.1038/cddis.2017.342
  • Primary Citation of Related Structures:  
    5MRA

  • PubMed Abstract: 

    Sorcin is a calcium binding protein that plays an important role in multidrug resistance (MDR) in tumors, since its expression confers resistance to doxorubicin and to other chemotherapeutic drugs. In this study, we show that Sorcin is able to bind doxorubicin, vincristine, paclitaxel and cisplatin directly and with high affinity. The high affinity binding of doxorubicin to sorcin has been demonstrated with different techniques, that is, surface plasmon resonance, fluorescence titration and X-ray diffraction. Although the X-ray structure of sorcin in complex with doxorubicin has been solved at low resolution, it allows the identification of one of the two doxorubicin binding sites, placed at the interface between the EF5 loop the G helix and the EF4 loop. We show that Sorcin cellular localization changes upon doxorubicin treatment, an indication that the protein responds to doxorubicin and it presumably binds the drug also inside the cell, soon after drug entrance. We also demonstrate that Sorcin is able to limit the toxic effects of the chemotherapeutic agent in the cell. In addition, Sorcin silencing increases cell death upon treatment with doxorubicin, increases the accumulation of doxorubicin in cell nucleus, decreases the expression of MDR1 and doxorubicin efflux via MDR1.


  • Organizational Affiliation

    Department of Biochemical Sciences, Sapienza University, Rome, Italy.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Sorcin
A, B, C, D
167Homo sapiensMutation(s): 0 
Gene Names: SRI
UniProt & NIH Common Fund Data Resources
Find proteins for P30626 (Homo sapiens)
Explore P30626 
Go to UniProtKB:  P30626
PHAROS:  P30626
GTEx:  ENSG00000075142 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP30626
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
DM2
Query on DM2

Download Ideal Coordinates CCD File 
K [auth B]DOXORUBICIN
C27 H29 N O11
AOJJSUZBOXZQNB-TZSSRYMLSA-N
DMS
Query on DMS

Download Ideal Coordinates CCD File 
J [auth B]DIMETHYL SULFOXIDE
C2 H6 O S
IAZDPXIOMUYVGZ-UHFFFAOYSA-N
MG
Query on MG

Download Ideal Coordinates CCD File 
E [auth A]
F [auth A]
G [auth A]
H [auth B]
I [auth B]
E [auth A],
F [auth A],
G [auth A],
H [auth B],
I [auth B],
L [auth C],
M [auth C],
N [auth C],
O [auth D],
P [auth D]
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.74 Å
  • R-Value Free: 0.285 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.196 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 92.229α = 90
b = 104.831β = 90
c = 113.273γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
XDSdata scaling
MOLREPphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2017-11-29
    Type: Initial release
  • Version 1.1: 2024-01-17
    Changes: Data collection, Database references, Derived calculations, Refinement description