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The racemic mixture of synthetic d and l-monellin has been crystallized, and its structure has been determined by X-ray crystallography at 1.9 Å resolution. The crystal structure consists of two d and two l-monellin molecules in the P1 unit cell with a pseudo-centrosymmetrical arrangement. The final structure reveals small but significant structural differences between d and l-monellin in the same...
Monellin, an intensely sweet protein and a non-sweet analog in which the Asp B7 in monellin has been replaced with Abu B7 were studied by NMR. The results of our investigations show that the 3-dimensional structure of these two proteins are very similar indicating that the lack of the β-carboxyl group in the Abu B7 analog is responsible for the loss of sweet potency. Selectively...
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