Bacterium-based heavy metal biosorbents: Enhanced uptake of cadmium by E. coli Expressing a metallothionein fused to β-galactosidase

Naoto Yoshida, T. Kato, T. Yoshida, K. Ogawa, M. Yamashita, Y. Murooka

Research output: Contribution to journalArticle

14 Citations (Scopus)


We investigated the potential utility of a recombinant E. coli that expresses the human metallothionein II gene as a fusion protein with β-galactosidase as a heavy metal biosorbent. E. coli cells expressing the metallothionein fusion demonstrated enhanced binding of Cd2+ compared to cells that lack the metallothionein. It was shown that the metallothionein fusion was capable of efficiently removing Cd2+ from solutions. Approximately 40% of the Cd2+ accumulated by the recombinant cells free in suspension was associated with the outer cell membrane, and 60% of that was present in the cytoplasm.

Original languageEnglish
Pages (from-to)551-558
Number of pages8
Issue number3
Publication statusPublished - 2002 Mar 20


ASJC Scopus subject areas

  • Biotechnology
  • Biochemistry, Genetics and Molecular Biology(all)

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