Chemical Modification of Tryptophan Residues in Abrin-a(Biological Chemistry)
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概要
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Chemical modification of tryptophan residues in abrin-a with N-bromosuccinimide (NBS) was studied with regard to saccharide-binding. The number of tryptophan residues available for NBS oxidation increased with lowering pH, and 11 out of the 13 tryptophan residues in abrin-a were eventually modified with NBS at pH 4.0, while 6 tryptophan residues were modified at pH 6.0 in the absence of specific saccharides. Modification of tryptophan residues at pH 6.0 greatly decreased the saccharide-binding ability of abrin-a, and only 2% of the hemagglutinating activity was retained after modification of 3 residues/mol. When the modification was done in the presence of lactose or galactose, 1 out of 3 residues/mol remained unmodified with a retention of a fairly high hemagglutinating activity. However, GaINAc did not show such a protective effect. NBS-oxidation led to a great loss of the fluorescence of abrin-a, and after modification of 3 tryptophan residues/mol, the fluorescence intensity at 345 nm was only 38% of that of the unmodified abrin-a. The binding of lactose to abrin-a altered the environment of the tryptophan residue at the saccharide-binding site of abrin-a, leading to a blue shift of the fluorescence spectrum. The ability to generate such fluorescence spectroscopic changes induced by lactose-binding was retained in the derivative in which 2 tryptophan residues/mol were oxidized in the presence of lactose, but not in the derivative in which 3 tryptophan residues/mol were oxidized in the absence of lactose. Importance of the tryptophan residue(s) in the saccharide-binding of abrin-a is suggested.
- 社団法人日本農芸化学会の論文
- 1991-06-23
著者
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Ohba Hideki
Laboratory Of Biochemistry And Laboratory Of Protein Chemistry And Engineering Faculty Of Agricultur
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YAMASAKI Nobuyuki
Laboratory of Biochemistry, Faculty of Agriculture, Kyushu University
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FUNATSU Gunki
Laboratory of Biochemistry, Faculty of Agriculture, Kyushu University
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Yamasaki Nobuyuki
Laboratory Of Biochemistry Faculty Of Agriculture Graduate School Kyushu University
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Yamasaki Nobuyuki
Laboratory Of Biochemistry And Laboratory Of Protein Chemistry And Engineering Faculty Of Agricultur
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Yamasaki N
Laboratory Of Biochemistry Faculty Of Agriculture Graduate School Kyushu University
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Ohba H
Kyushu National Industrial Res. Inst. Saga Jpn
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Funatsu G
Kyushu Univ. Fukuoka Jpn
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Funatsu Gunki
Laboratory Of Biochemistry And ** Laboratory Of Protein Chemistry & Engineering Faculty Of Agric
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Yamasaki Nobuyuki
Laboratory Of Biochemistry Department Of Bioscience And Biotechnology Graduate School Faculty Of Agr
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Yamasaki Nobuyuki
Laboratory Of Agricultural Process Engineering Faculty Of Agriculture Kyushu University
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