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Single-point mutants of GroEL were constructed with tryptophan replacing a tyrosine residue in order to examine nucleotide-induced structural transitions spectrofluorometrically. The tyrosine residues at positions 203, 360, 476 and 485 were mutated. Of these, the probe at residue 485 gave the clearest fluorescence signals upon nucleotide binding. The probe at 360 reported similar signals. In response...
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