Platinum(II) triammine antitumour complexes: Structure-activity relationship with guanosine 5′-monophosphate (5′-GMP)

Victor X. Jin, Siew I. Tan, John D. Ranford

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

The multinuclear (1H, 15N, 31P and 195Pt) NMR spectroscopies, ES-MS and HPLC have been employed to investigate the structure-activity relationship for the reactions between guanosine 5′-monophosphate (5′-GMP) and the platinum(II)-triamine complexes of the general formulation cis-[Pt(NH3)2(Am)Cl] NO3 (where Am represents a substituted pyridine). The order of reaction rate of the reactions was found to be: 3-phpy > 4-phpy > py > 4-mepy > 3-mepy > 2-mepy. The two basic factors, steric and electronic, were attributed to the order of the binding rate constants. A possible mechanism of the reaction of cis-[Pt(NH3)2(Am)Cl]+ with 5′-GMP suggested that the reactions proceed via direct nucleophilic attack and no loss of ammonia. cis-[Pt(NH3)2(Am)Cl]+ binds to the N7 nitrogen of the guanine residue of 5′-GMP to form a coordinate bond with the Pt metal centre. This mechanism is apparently different from that of cisplatin. The pKa value of cis-[Pt(NH 3)2(4-mepy)(H2O)](NO3)2 (5.63) has been determined at 298 K by the use of distortionless enhancement by polarization transfer (DEPT) 15N NMR spectroscopy and compared to the pKa value of cis-[PtCl(H2O)(NH3) 2]+.

Original languageEnglish (US)
Pages (from-to)677-686
Number of pages10
JournalInorganica Chimica Acta
Volume358
Issue number3
DOIs
StatePublished - Feb 10 2005
Externally publishedYes

Keywords

  • HPLC
  • Multinuclear NMR
  • Platinum-triamine complex

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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