Expression of a Carboxy-Terminal Deletion Mutant of Recombinant Tadpole H-Chain Ferritin in Escherichia coli

  • Lee, Mi-Young (Department of Molecular Biology and Institute for Molecular Biology and Genetics, Chonbuk National University) ;
  • Kim, Young-Taek (Department of Molecular Biology and Institute for Molecular Biology and Genetics, Chonbuk National University) ;
  • Kim, Kyung-Suk (Department of Molecular Biology and Institute for Molecular Biology and Genetics, Chonbuk National University)
  • Received : 1996.04.09
  • Published : 1996.09.30

Abstract

In order to study the role of the protein shell in both iron uptake and iron core formation of ferritin, we constructed a deletion mutant of the ferritin gene and expressed the mutant gene in Escherichia coli, This mutant was obtained by introducing an amber mutation at position Pro-157 and a deletion of the 19 amino acid residues at the carboxy-terminus of the recombinant tadpole H-chain ferritin. The deleted amino acids correspond to E-helix forming the hydrophobic channel in the protein. E. coli harboring the plasmid pTHP157, which contains the deleted gene, was grown at $23^{\circ}C$ in the presence of 0.1 mM IPTG, and the induced protein appeared to be partly soluble. Nondenaturing polyacrylamide gel electrophoresis showed that the expressed mutant H-chains coassemble into holoprotein, suggesting that E-helix is not necessary for assembly of the subunits as reported for human H-chain ferritin. Its ability in iron core formation was proven in an Fe staining gel, the result disagreeing with the observation that the hydrophobic channel is necessary for iron core formation in human H-chain ferritin.

Keywords

carboxy-terminal deletion mutant;tadpole H-chain ferritin

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