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cDNA cloning and characterization of a rhamnose-binding lectin SUL-I from the toxopneustid sea urchin Toxopneustes pileolus venom


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Title: cDNA cloning and characterization of a rhamnose-binding lectin SUL-I from the toxopneustid sea urchin Toxopneustes pileolus venom
Authors: Hatakeyama, Tomomitsu / Ichise, Ayaka / Yonekura, Tomokazu / Unno, Hideaki / Goda, Shuichiro / Nakagawa, Hideyuki
Issue Date: Feb-2015
Publisher: Elsevier Limited
Citation: Toxicon, 94, pp.8-15; 2015
Abstract: The globiferous pedicellariae of the venomous sea urchin Toxopneustes pileolus contain several biologically active proteins. Among these, a galactose-binding lectin SUL-I isolated from the venom in the large globiferous pedicellariae shows several activities such as mitogenic, chemotactic, and cytotoxic activities through binding to the carbohydrate chains on the cells. We cloned cDNA encoding SUL-I by reverse transcription-PCR using the degenerate primers designed on the basis of the N-terminal amino acid sequence of the protein and expressed the recombinant SUL-I (rSUL-I) in Escherichia coli cells. The SUL-I gene contains an open reading frame of 927 nucleotides corresponding to 308 amino acid residues, including 24 residues of a putative signal sequence. The mature protein with 284 residues is composed of three homologous regions, each showing similarity with the carbohydrate-recognition domains of the rhamnose-binding lectins, which have been mostly found in fish eggs. While rSUL-I exhibited binding activity for several galactose-related sugars, the highest affinity was found for l-rhamnose among carbohydrates tested, confirming that SUL-I is a rhamnose-binding lectin. rSUL-I also showed hemagglutinating activity toward rabbit erythrocytes, indicating the existence of more than one carbohydrate-binding site to cross-link the carbohydrate chains on the cell surface, which may be closely related to its biological activities.
Keywords: Carbohydrate-binding / cDNA cloning / Lectin / Rhamnose / Sea urchin / Toxopneustes pileolus
URI: http://hdl.handle.net/10069/35011
ISSN: 00410101
DOI: 10.1016/j.toxicon.2014.11.236
Rights: © 2015 Elsevier Ltd. / NOTICE: this is the author’s version of a work that was accepted for publication in Toxicon. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Toxicon, 94, (2015)
Type: Journal Article
Text Version: author
Appears in Collections:Articles in academic journal

Citable URI : http://hdl.handle.net/10069/35011

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