Molecular cloning of a cDNA encoding ribosome inactivating protein from Amaranthus viridis and its expression in E. coli

Suk Yoon Kwon, Chung Sun An, Jang Ryol Liu, Sang Soo Kwak, Haeng Soon Lee, Jeong Kook Kim, Kyung Hee Paek

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23 Citations (Scopus)


In order to isolate a cDNA clone of ribosome inactivating protein (RIP), a cDNA library was constructed in Uni-ZAP XL vector with poly(A) RNA purified from leaves of Amaranthus viridis. To get the probe for screening the library, PCR of phage DNA was conducted using the vector primer and degenerate primer designed from a conserved putative active site of the RIPs. Twenty-six cDNA clones from about 600,000 plaques were isolated, and one of these clones was fully sequenced. It was 1,047 bp and contained an open reading frame encoding 270 amino acids. The deduced amino acid sequence had a putative signal sequence of 17 amino acids and a putative active site (AIQMVAEAARFFKYIE) conserved in other RIPs. E. coli cells expressing A. viridis RIP cDNA did not grow well as compared to control cells, indicating that recombinant A. viridis RIP presumably inactivated E. coli ribosomes. In addition, recombinant A. viridis RIP cDNA produced by E. coli had translation inhibition activity in vitro.

Original languageEnglish
Pages (from-to)8-12
Number of pages5
JournalMolecules and Cells
Issue number1
Publication statusPublished - 2000 Feb 29



  • Amaranthus viridis
  • cDNA
  • Expression
  • Ribosome inactivating protein

ASJC Scopus subject areas

  • Cell Biology
  • Genetics
  • Molecular Biology

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