Identification of transdominant-negative genetic suppressor elements derived from hMSH2 that mediate resistance to 6-thioguanine.

نویسندگان

  • Maida M de las Alas
  • Gerrit Los
  • Xinjian Lin
  • Buran Kurdi-Haidar
  • Gerald Manorek
  • Stephen B Howell
چکیده

Using random screening for genetic suppressor elements, we sought to identify portions of hMSH2 important to the ability of the mismatch repair system to recognize and process DNA adducts that mimic mismatches. All recovered candidate genetic suppressor elements were derived from the region containing amino acids 782 to 844. Expression of a peptide corresponding to this region partially disabled mismatch repair as evidenced by 1.5- to 3.3-fold resistance to 6-thioguanine, cisplatin, and N-methyl-N'-nitrosoguanidine, an increase in the rate of generation of drug resistant variants, and the appearance of microsatellite instability. Even low-level expression of this protein was sufficient to partially impair mismatch repair. The results suggest that this region is important to the ability of the mismatch repair system to mediate drug sensitivity and to maintain genomic stability.

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عنوان ژورنال:
  • Molecular pharmacology

دوره 62 5  شماره 

صفحات  -

تاریخ انتشار 2002