Nucleic Acids Research, Vol 25, Issue 3 491-496, Copyright © 1997 by Oxford University Press
M Yamada, E O'Regan, R Brown and P Karran
The antitumor agent cis-diamminedichloroplatinum(II) (cisplatin) introduces
cytotoxic DNA damage predominantly in the form of intrastrand crosslinks
between adjacent purines. Binding assays using a series of duplex
oligonucleotides containing a single 1,2 diguanyl intrastrand crosslink
indicate that human cell extracts contain factors that preferentially
recognise this type of damage when the complementary strand contains T
opposite the 3', and C opposite the 5'guanine in the crosslink. Under the
conditions of the band-shift assay used, little binding is observed if the
positions of the T and C are reversed in the complementary strand.
Similarly, duplexes containing CC or TT opposite the crosslink are
recognised relatively poorly. The binding activity is absent from extracts
of the colorectal carcinoma cell lines LoVo and DLD-1 in which the
hMutSalpha mismatch recognition complex is inactivated by mutation.
Extensively purified human hMutSalpha exhibits the same substrate
preference and binds to the mismatched platinated DNA at least as well as
to an identical unplatinated duplex containing a single G.T mismatch. It is
likely, therefore, that human mismatch repair may be triggered by 1,2
diguanyl intrastrand crosslinks that have undergone replicative bypass.
ARTICLES
Selective recognition of a cisplatin-DNA adduct by human mismatch repair proteins
Imperial Cancer Research Fund, Clare Hall Laboratories, South Mimms, Hertfordshire EN6 3LD, UK.
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