Cisplatin binding to β-lactoglobulin: a structural study

Dalton Trans. 2020 Sep 15;49(35):12450-12457. doi: 10.1039/d0dt02582h.

Abstract

β-Lactoglobulin is a major globular milk whey carrier with potential applications as an oral drug delivery system. Herein, the interactions between β-lactoglobulin and cisplatin are investigated by UV-Vis absorption spectroscopy, circular dichroism, X-ray crystallography and electrospray ionization mass spectrometry. Structural data indicate that the protein retains its conformation upon cisplatin binding. Pt-containing fragments bind the side chains of Met7, His146 and Lys8, with the number of binding sites increasing over time. Mass spectrometry data indicate that [Pt(NH3)2Cl+], [Pt(NH3)2OH22+] and [Pt(NH3)22+] fragments interact with β-lactoglobulin; up to 3 cisplatin fragments can bind the protein and the number of cisplatin binding sites increases over time. This work opens a new pathway in pharmaceutical studies based on a rational design of metal-based drug/β-lactoglobulin adducts as delivering vehicles of metallodrugs.

MeSH terms

  • Cisplatin / chemistry*
  • Lactoglobulins / chemistry*
  • Models, Molecular
  • Protein Binding
  • Protein Conformation

Substances

  • Lactoglobulins
  • Cisplatin