This enzyme appears to bind its substrate very tightly, yet enzymes must readily release products to be catalytically efficient. The region 'resolidifies' when the binding site is opened and the products are released. This mechanism is thought to act as an 'energetic counterweight' to help adenylate kinase maintain a high reaction rate. You should find the text's explanation puzzling at first. Let's analyze this effect more carefully.
More disorder implies fewer noncovalent interactions in the remote region.
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