A novel type of limulus lectin-L6: Purification, primary structure, and antibacterial activity

Tetsu Saito, Shun-Ichiro Kawabata, Michimasa Hirata, Sadaaki Iwanaga

研究成果: ジャーナルへの寄稿記事

71 引用 (Scopus)

抄録

Lipopolysaccharide (LPS)-binding protein(s) was first screened in the detergent extract of horseshoe crab (limulus) hemocytes, using LPS-immobilized agarose. A protein, designated L6 (Mr = 27,000), was found to bind to LPS-agarose and was eluted with EDTA or o-phenanthroline. The L6 protein, however, did not inhibit the LPS-mediated activation of a limulus serine protease zymogen factor C. L6 had an affinity to the matrix of Sepharose CL-6B itself, and it could be eluted with high concentrations of monosaccharides (0.5-1.0 M), such as glucose, mannose, and galactose, suggesting a lectin-like nature. The entire amino acid sequence of L6 was determined by sequencing peptides derived from CNBr and enzymatic cleavages. L6 contained 7 half-cystines, and 1 cysteine residue at position 201 had a free SH-group. In addition, positions of the remaining three intrachain disulfide bonds were assigned by amino acid and sequence analyses of three cystinyl peptides produced by lysyl endopeptidase digestion. These results indicated that the entire sequence of L6 consisted of 221 residues with no N-linked sugar and was composed of six tandem repeats, each consisting of 33-38 amino acid residues. Inductively coupled plasma spectrometry of L6 indicated the presence of 0.75 mol zinc/mol of protein. No significant sequence homology was observed between L6 and other proteins, including various animal lectins and LPS-binding proteins. However, L6 showed agglutinating activity on LPS-coated sheep erythrocytes and Gram-negative and Gram-positive bacteria, it inhibited the growth of Gram-negative bacteria, and thus it presumably recognizes carbohydrate components in the cell wall of bacteria.

元の言語英語
ページ(範囲)14493-14499
ページ数7
ジャーナルJournal of Biological Chemistry
270
発行部数24
DOI
出版物ステータス出版済み - 6 16 1995

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Horseshoe Crabs
Purification
Lipopolysaccharides
Bacteria
lysyl endopeptidase
Lectins
Amino Acids
Sepharose
Cysteine
Proteins
Hemocytes
Peptides
Enzyme Precursors
Tandem Repeat Sequences
Monosaccharides
Protein Sequence Analysis
Gram-Positive Bacteria
Inductively coupled plasma
Serine Proteases
Mannose

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Molecular Biology
  • Cell Biology

これを引用

A novel type of limulus lectin-L6 : Purification, primary structure, and antibacterial activity. / Saito, Tetsu; Kawabata, Shun-Ichiro; Hirata, Michimasa; Iwanaga, Sadaaki.

:: Journal of Biological Chemistry, 巻 270, 番号 24, 16.06.1995, p. 14493-14499.

研究成果: ジャーナルへの寄稿記事

Saito, Tetsu ; Kawabata, Shun-Ichiro ; Hirata, Michimasa ; Iwanaga, Sadaaki. / A novel type of limulus lectin-L6 : Purification, primary structure, and antibacterial activity. :: Journal of Biological Chemistry. 1995 ; 巻 270, 番号 24. pp. 14493-14499.
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abstract = "Lipopolysaccharide (LPS)-binding protein(s) was first screened in the detergent extract of horseshoe crab (limulus) hemocytes, using LPS-immobilized agarose. A protein, designated L6 (Mr = 27,000), was found to bind to LPS-agarose and was eluted with EDTA or o-phenanthroline. The L6 protein, however, did not inhibit the LPS-mediated activation of a limulus serine protease zymogen factor C. L6 had an affinity to the matrix of Sepharose CL-6B itself, and it could be eluted with high concentrations of monosaccharides (0.5-1.0 M), such as glucose, mannose, and galactose, suggesting a lectin-like nature. The entire amino acid sequence of L6 was determined by sequencing peptides derived from CNBr and enzymatic cleavages. L6 contained 7 half-cystines, and 1 cysteine residue at position 201 had a free SH-group. In addition, positions of the remaining three intrachain disulfide bonds were assigned by amino acid and sequence analyses of three cystinyl peptides produced by lysyl endopeptidase digestion. These results indicated that the entire sequence of L6 consisted of 221 residues with no N-linked sugar and was composed of six tandem repeats, each consisting of 33-38 amino acid residues. Inductively coupled plasma spectrometry of L6 indicated the presence of 0.75 mol zinc/mol of protein. No significant sequence homology was observed between L6 and other proteins, including various animal lectins and LPS-binding proteins. However, L6 showed agglutinating activity on LPS-coated sheep erythrocytes and Gram-negative and Gram-positive bacteria, it inhibited the growth of Gram-negative bacteria, and thus it presumably recognizes carbohydrate components in the cell wall of bacteria.",
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