DescriptionActive site of Thymidylate Synthase.png
English: This figure shows the possible H-bond interactions between the arginines and the UMP in the active site of thymidylate synthase. This can be seen by the faint lines between the blue tips and the red tips. These arginines are used to hold the position of the UMP molecule so that the interaction may occur correctly. The two arginines in the top right corner that are located next to each other on the back bone are actually from the other protein of this dimer enzyme. This interaction is one of the many intermolecular forces that holds these two tertiary structures together. The yellow stand in the top-middle region shows a sulfur bond that forms between a cysteine side chain and UMP. This covalently holds the UMP within the active site until it is reacted to yield TMP.
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