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Platinum-based drugs and proteins: reactivity and relevance to DNA adduct formation.

Abstract：

:The mechanism of action of clinically used Pt-based drugs is through the formation of stable DNA adducts occurring at the nitrogen in position 7 of guanine (N7) and involving one or two spatially closed residues. Nevertheless, proteins can represent alternative targets since in particular sulfur groups, present in cysteine or methionine residues, can efficiently coordinate platinum. Here we have characterized the reactivity profile of cisplatin, transplatin and of two trans-platinum amine derivatives (TPAs) towards three different proteins, bovine α-lactalbumin (α-LA), hen egg lysozyme (LYS) and human serum albumin (HSA). Our results demonstrate that generally the tested metal complexes react with the selected target causing protein oligomerization, likely through a cross-linking reaction. Interestingly, the extent of such a process is largely modulated by the target protein and by the chemical features of the metal complex, TPAs being the most efficient platinating agents. From a structural point of view the resulting reaction products turned out to be depending on the nature of the metal complexes. However, in all instances, a transfer reaction of the metal complex to DNA can also occur, maintaining the relevance of nucleic acids as a biological target. These results can be used to better rationalize the different pharmacological profiles reported for cisplatin and TPAs and can help in designing more predictive SARs within the series.

journal_name

J Inorg Biochem

journal_title

Journal of inorganic biochemistry

authors

Pinato O,Musetti C,Farrell NP,Sissi C

doi

10.1016/j.jinorgbio.2013.01.007

subject

Has Abstract

pub_date

2013-05-01 00:00:00

pages

27-37

eissn

0162-0134

issn

1873-3344

pii

S0162-0134(13)00015-9

journal_volume

122

pub_type

杂志文章

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