Difference Spectroscopic Study of the Interaction between Soybean β-Amylase and Substrate or Substrate Analogues

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Abstract
Since the signal at 298–299 urn was not found in the difference spectrum of maltose, this singnal may be due to a tryptophan residue different from that which produces the signal at 292–293 nm. If both the signals are due to the same tryptophan residue, we must conclude that some conformational change is caused in the enzyme active site by the ligand binding.

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