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char = s;code = 115
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char = e;code = 101
char = n;code = 110
char = z;code = 122
char = y;code = 121
char = m;code = 109
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char = c;code = 99
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char = v;code = 118
char = i;code = 105
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char = e;code = 101
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char = t;code = 116
char = o;code = 111
char = x;code = 120
char = i;code = 105
char = n;code = 110
char = s;code = 115
char = .;code = 46
result sql = A common motif of eukaryotic glycosyltransferases is essential for the enzyme activity of large clostridial cytotoxins.
A common motif of eukaryotic glycosyltransferases is essential for the enzyme activity of large clostridial cytotoxins.
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char = n;code = 110
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char = a;code = 97
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char = l;code = 108
char = ;code = 32
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char = a;code = 97
char = r;code = 114
char = g;code = 103
char = e;code = 101
char = ;code = 32
char = c;code = 99
char = l;code = 108
char = o;code = 111
char = s;code = 115
char = t;code = 116
char = r;code = 114
char = i;code = 105
char = d;code = 100
char = i;code = 105
char = a;code = 97
char = l;code = 108
char = ;code = 32
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char = e;code = 101
char = r;code = 114
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = g;code = 103
char = l;code = 108
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char = f;code = 102
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char = s;code = 115
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char = s;code = 115
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char = o;code = 111
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char = o;code = 111
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char = ;code = 32
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char = f;code = 102
char = ;code = 32
char = U;code = 85
char = D;code = 68
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char = o;code = 111
char = s;code = 115
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result sql = A fragment of the N-terminal 546 amino acid residues of Clostridium sordellii lethal toxin possesses full enzyme activity and glucosylates Rho and Ras GTPases in vitro. Here we identified several amino acid residues in C. sordellii lethal toxin that are essential for the enzyme activity of the active toxin fragment. Exchange of aspartic acid at position 286 or 288 with alanine or asparagine decreased glucosyltransferase activity by about 5000-fold and completely blocked glucohydrolase activity. No enzyme activity was detected with the double mutant D286A/D288A. Whereas the wild-type fragment of C. sordellii lethal toxin was labeled by azido-UDP-glucose after UV irradiation, mutation of the DXD motif prevented radiolabeling. At high concentrations (10 mM) of manganese ions, the transferase activities of the D286A and D288A mutants but not that of wild-type fragment were increased by about 20-fold. The exchange of Asp270 and Arg273 reduced glucosyltransferase activity by about 200-fold and blocked glucohydrolase activity. The data indicate that the DXD motif, which is highly conserved in all large clostridial cytotoxins and also in a large number of glycosyltransferases, is functionally essential for the enzyme activity of the toxins and may participate in coordination of the divalent cation and/or in the binding of UDP-glucose.

Publication: J. Biol. Chem. 1998 Jul 31 ;273(31)::19566-72.
Publication Date: 1998 Jul 31
Study Author(s): Busch, C;Hofmann, F;Selzer, J;Munro, S;Jeckel, D;Aktories, K;
Institution: Institut für Pharmakologie und Toxikologie der Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Str. 5, D-79104 Freiburg, Germany.
Shortcut link to this study:
A fragment of the N-terminal 546 amino acid residues of Clostridium sordellii lethal toxin possesses full enzyme activity and glucosylates Rho and Ras GTPases in vitro. Here we identified several amino acid residues in C. sordellii lethal toxin that are essential for the enzyme activity of the active toxin fragment. Exchange of aspartic acid at position 286 or 288 with alanine or asparagine decreased glucosyltransferase activity by about 5000-fold and completely blocked glucohydrolase activity. No enzyme activity was detected with the double mutant D286A/D288A. Whereas the wild-type fragment of C. sordellii lethal toxin was labeled by azido-UDP-glucose after UV irradiation, mutation of the DXD motif prevented radiolabeling. At high concentrations (10 mM) of manganese ions, the transferase activities of the D286A and D288A mutants but not that of wild-type fragment were increased by about 20-fold. The exchange of Asp270 and Arg273 reduced glucosyltransferase activity by about 200-fold and blocked glucohydrolase activity. The data indicate that the DXD motif, which is highly conserved in all large clostridial cytotoxins and also in a large number of glycosyltransferases, is functionally essential for the enzyme activity of the toxins and may participate in coordination of the divalent cation and/or in the binding of UDP-glucose.
PMID: 9677381

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