Metala-Carborane di-propyl-sulfonamide

Experimental Data Snapshot

  • Resolution: 1.55 Å
  • R-Value Free: 0.154 
  • R-Value Work: 0.134 
  • R-Value Observed: 0.134 

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Cobalt Bis(dicarbollide) Alkylsulfonamides: Potent and Highly Selective Inhibitors of Tumor Specific Carbonic Anhydrase IX.

Gruner, B.Kugler, M.El Anwar, S.Holub, J.Nekvinda, J.Bavol, D.Ruzickova, Z.Pospisilova, K.Fabry, M.Kral, V.Brynda, J.Rezacova, P.

(2021) Chempluschem 86: 352-363

  • DOI: https://doi.org/10.1002/cplu.202000574
  • Primary Citation of Related Structures:  
    6YJ3, 6YKC, 6YKH

  • PubMed Abstract: 

    Carbonic anhydrase IX (CAIX) is an enzyme expressed on the surface of cells in hypoxic tumors. It plays a role in regulation of tumor pH and promotes thus tumor cell survival and occurrence of metastases. Here, derivatives of the cobalt bis(dicarbollide)(1-) anion are reported that are based on substitution at the carbon sites of the polyhedra by two alkylsulfonamide groups differing in the length of the aliphatic connector (from C1 to C4, n=1-4), which were prepared by cobalt insertion into the 7-sulfonamidoalkyl-7,8-dicarba-nido-undecaborate ions. Pure meso- and rac-diastereoisomeric forms were isolated. The series is complemented with monosubstituted species (n=2). Synthesis by a direct method furnished similar derivatives (n=2, 3), which are chlorinated at the B(8,8') boron sites. All compounds inhibited CAIX with subnanomolar inhibition constants and showed high selectivity for CAIX. The best inhibitory properties were observed for the compound with n= 3 and two substituents present in rac-arrangement with K i =20 pM and a selectivity index of 668. X-ray crystallography was used to study interactions of these compounds with the active site of CAIX on the structural level.

  • Organizational Affiliation

    Department of Synthesis, Institute of Inorganic Chemistry of the Czech Academy of Sciences, 250 68, Řež, Czech Republic.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Carbonic anhydrase 2260Homo sapiensMutation(s): 7 
Gene Names: CA2
UniProt & NIH Common Fund Data Resources
Find proteins for P00918 (Homo sapiens)
Explore P00918 
Go to UniProtKB:  P00918
PHAROS:  P00918
GTEx:  ENSG00000104267 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP00918
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.55 Å
  • R-Value Free: 0.154 
  • R-Value Work: 0.134 
  • R-Value Observed: 0.134 
  • Space Group: P 63
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 100.479α = 90
b = 100.479β = 90
c = 42.468γ = 120
Software Package:
Software NamePurpose
XDSdata reduction
XSCALEdata scaling
PDB_EXTRACTdata extraction

Structure Validation

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Ligand Structure Quality Assessment 

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Czech Science FoundationCzech RepublicGA15-05677S
Technology Agency of the Czech RepublicCzech RepublicTE01020028

Revision History  (Full details and data files)

  • Version 1.0: 2020-09-09
    Type: Initial release
  • Version 1.1: 2020-09-30
    Changes: Database references
  • Version 1.2: 2021-03-10
    Changes: Database references
  • Version 1.3: 2024-01-24
    Changes: Advisory, Data collection, Database references, Refinement description