ENHANCEMENT OF BINDING RATE OF RECA PROTEIN TO DNA BY CARCINOGENIC BENZO A PYRENE DERIVATIVES AND SELECTIVE CHANGE OF ADDUCT CONFORMATION
Artikel i vetenskaplig tidskrift, 1993

The association kinetics of RecA protein from Escherichia coli to DNA is strongly enhanced if even a minor fraction of DNA bases has been modified by a carcinogenic (+)-anti metabolite of benzo[a]pyrene (BPDE). The enhancement is much smaller with the less carcinogenic (-)-anti enantiomer of BPDE suggesting the possibility that the RecA protein binds selectively to the proto-oncogenic target. Most importantly, the binding of RecA to DNA modified with the latter enantiomer is found to give rise to a reorganization of this BPDE adduct from an intercalation site into a minor groove site. This indicates that the binding mechanism of RecA is via intercalation of some amino acid moiety, a discovery that could explain the approximately 50% contour length increase of the DNA within its fibrous complex with RecA.

electron-microscopy

coordination

linear dichroism spectroscopy

complexes

Författare

Seog K. Kim

Institutionen för fysikalisk kemi

Masayuki Takahashi

Institutionen för fysikalisk kemi

B. Jernstrom

Bengt Nordén

Institutionen för fysikalisk kemi

Carcinogenesis

0143-3334 (ISSN) 1460-2180 (eISSN)

Vol. 14 311-313

Ämneskategorier

Cancer och onkologi

DOI

10.1093/carcin/14.2.311