Folding topology and DNA binding of the N-terminal fragment of ada protein

Hitoshi Sakashita, Takahiko Sakuma, Tadayasu Ohkubo, Masatsune Kainosho, Kunihiko Sakumi, Mutsuo Sekiguchi, Kosuke Morikawa

研究成果: Contribution to journalArticle査読

18 被引用数 (Scopus)


Three amino terminal fragments of Escherichia coli Ada protein (39 kDa) with different molecular masses (14 kDa, 16 kDa and 20 kDa) were prepared in large quantities from an E. coli strain harboring plasmids constructed for the overproduction of the truncated proteins. The three fragments can be methylated to an extent similar to that of the intact molecule. The methylated 16 kDa fragment specifically binds to the ada box on a DNA duplex. NMR analyses revealed that the 14 kDa fragment comprises two α-helices and a β-sheet with parallel and anti-parallel mixed strands. A comparison of the 15N-1H HMQC spectra of the fragments has led to the conclusion that this tertiary structure within the 14 kDa fragment is retained in the larger 16 kDa and 20 kDa fragments.

ジャーナルFEBS Letters
出版ステータス出版済み - 6 1 1993

All Science Journal Classification (ASJC) codes

  • 生物理学
  • 構造生物学
  • 生化学
  • 分子生物学
  • 遺伝学
  • 細胞生物学


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