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J Interferon Cytokine Res. 1995 Jun;15(6):547-55.

Amino acid sequence analysis, gene construction, cloning, and expression of gelonin, a toxin derived from Gelonium multiflorum.

Author information

1
Department of Clinical Immunology and Biological Therapy, University of Texas-M.D. Anderson Cancer Center, Houston 77030, USA.

Abstract

The plant toxin gelonin is an extremely potent inhibitor of protein synthesis, similar in action to ricin. The mature protein primary sequence was obtained using conventional sequencing techniques. Gelonin was found to be composed of 258 amino acids and contains 21 lysine residues. This toxin shares approximately 33% sequence homology with trichosanthin and ricin A chain. A 774 bp synthetic gene encoding gelonin was synthesized and expressed in E. coli. Recombinant gelonin (approximately 28 kD) expression was monitored and demonstrated by western analysis. Purification and functional activity studies demonstrated that this protein behaves identically to that of the natural product. Recombinant gelonin (RG) thus joins a growing list of recombinant toxins currently available for use in the construction of recombinant immunotoxins composed of gelonin fused to binding domains of antibodies, growth factors, or other cytokines.

PMID:
7553224
DOI:
10.1089/jir.1995.15.547
[Indexed for MEDLINE]

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