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Korean Society for Biochemistry and Molecular Biology (생화학분자생물학회)
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Functional properties of the thermostable mutL from Thermotoga maritima

  • Kim, Tae-Gyun (Department of Chemistry, Pohang University of Science and Technology) ;
  • Heo, Seong-Dal (Department of Chemistry, Pohang University of Science and Technology) ;
  • Ku, Ja-Kang (Department of Chemistry, Pohang University of Science and Technology) ;
  • Ban, Chang-Ill (Department of Chemistry, Pohang University of Science and Technology)
  • Published : 2009.01.31
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Abstract

The methyl-directed mismatch repair (MMR) mechanism has been extensively studied in vitro and in vivo, but one of the difficulties in determining the biological relationships between the MMR-related proteins is the tendency of MutL to self-aggregate. The properties of a stable MutL homologue were investigated using a thermostable MutL (TmL) from Thermotoga maritima MSB8 and whose size exclusion chromatographic and crosslinking analyses were compatible with a dimeric form of TmL. TmL underwent conformational changes in the presence of nucleotides and single-stranded DNA (ssDNA) with ATP binding not requiring ssDNA binding activity of TmL, while ADPnP-stimulated TmL showed a high ssDNA binding affinity. Finally, TmL interacted with the T. maritima MutS (TmS), increasing the affinity of TmS to mismatched DNA base pairs and suggesting that the role of TmL in the formation of a mismatched DNA-TmS complex may be a pivotal observation for the study of the initial MMR system.

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References

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