Non-histone chromosomal proteins HMG1 and 2 enhance ligation reaction of DNA double-strand breaks

Sumiko Nagaki, Mayumi Yamamoto, Yoshiko Yumoto, Hitoshi Shirakawa, Michiteru Yoshida, Hirobumi Teraoka

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

DNA ligase IV in a complex with XRCC4 is responsible for DNA end-joining in repair of DNA double-strand breaks (DSB) and V(D)J recombination. We found that non-histone chromosomal high mobility group (HMG) proteins 1 and 2 enhanced the ligation of linearized pUC119 DNA with DNA ligase IV from rat liver nuclear extract. Intra-molecular and inter-molecular ligations of cohesive-ended and blunt-ended DNA were markedly stimulated by HMG1 and 2. Recombinant HMG2-domain A, B, and (A + B) polypeptides were similarly, but non-identically, effective for the stimulation of DSB ligation reaction. Ligation of single-strand breaks (nicks) was only slightly activated by the HMG proteins. The DNA end-binding Ku protein singly or in combination with the catalytic component of DNA-dependent protein kinase (DNA-PK) as the DNA-PK holoenzyme was ineffective for the ligation of linearized pUC119 DNA. Although the stimulatory effect of HMG1 and 2 on ligation of DSB in vitro was not specific to DNA ligase IV, these results suggest that HMG1 and 2 are involved in the final ligation step in DNA end-joining processes of DSB repair and V(D)J recombination.

Original languageEnglish
Pages (from-to)137-141
Number of pages5
JournalBiochemical and biophysical research communications
Volume246
Issue number1
DOIs
Publication statusPublished - 1998 May 8
Externally publishedYes

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology

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