4NSG

Carboplatin binding to HEWL in NaBr crystallisation conditions studied at an X-ray wavelength of 1.5418A


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.219 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Carboplatin binding to histidine.

Tanley, S.W.Diederichs, K.Kroon-Batenburg, L.M.Levy, C.Schreurs, A.M.Helliwell, J.R.

(2014) Acta Crystallogr F Struct Biol Commun 70: 1135-1142

  • DOI: 10.1107/S2053230X14016161
  • Primary Citation of Related Structures:  4LT0, 4LT3, 4NSF, 4NSH, 4NSI, 4NSJ, 4XAN
  • Also Cited By: 4YEM

  • PubMed Abstract: 
  • Carboplatin is a second-generation platinum anticancer agent used for the treatment of a variety of cancers. Previous X-ray crystallographic studies of carboplatin binding to histidine (in hen egg-white lysozyme; HEWL) showed the partial conversion o ...

    Carboplatin is a second-generation platinum anticancer agent used for the treatment of a variety of cancers. Previous X-ray crystallographic studies of carboplatin binding to histidine (in hen egg-white lysozyme; HEWL) showed the partial conversion of carboplatin to cisplatin owing to the high NaCl concentration used in the crystallization conditions. HEWL co-crystallizations with carboplatin in NaBr conditions have now been carried out to confirm whether carboplatin converts to the bromine form and whether this takes place in a similar way to the partial conversion of carboplatin to cisplatin observed previously in NaCl conditions. Here, it is reported that a partial chemical transformation takes place but to a transplatin form. Thus, to attempt to resolve purely carboplatin binding at histidine, this study utilized co-crystallization of HEWL with carboplatin without NaCl to eliminate the partial chemical conversion of carboplatin. Tetragonal HEWL crystals co-crystallized with carboplatin were successfully obtained in four different conditions, each at a different pH value. The structural results obtained show carboplatin bound to either one or both of the N atoms of His15 of HEWL, and this particular variation was dependent on the concentration of anions in the crystallization mixture and the elapsed time, as well as the pH used. The structural details of the bound carboplatin molecule also differed between them. Overall, the most detailed crystal structure showed the majority of the carboplatin atoms bound to the platinum centre; however, the four-carbon ring structure of the cyclobutanedicarboxylate moiety (CBDC) remained elusive. The potential impact of the results for the administration of carboplatin as an anticancer agent are described.


    Organizational Affiliation

    School of Chemistry, Faculty of Engineering and Physical Sciences, University of Manchester, Brunswick Street, Manchester M13 9PL, England.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Lysozyme C
A
129Gallus gallusGene Names: LYZ
EC: 3.2.1.17
Find proteins for P00698 (Gallus gallus)
Go to Gene View: LYZ
Go to UniProtKB:  P00698
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NA
Query on NA

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A
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
ACT
Query on ACT

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A
ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
BR
Query on BR

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A
BROMIDE ION
Br
CPELXLSAUQHCOX-UHFFFAOYSA-M
 Ligand Interaction
DMS
Query on DMS

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Download CCD File 
A
DIMETHYL SULFOXIDE
C2 H6 O S
IAZDPXIOMUYVGZ-UHFFFAOYSA-N
 Ligand Interaction
QPT
Query on QPT

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Download CCD File 
A
carboplatin
C6 H12 N2 O4 Pt
BHKICZDKIIDMNR-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.219 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 78.377α = 90.00
b = 78.377β = 90.00
c = 37.213γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
SAINTdata reduction
REFMACrefinement
APEXdata collection
APEXdata reduction

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-10-15
    Type: Initial release