As of late 2007, 21 structures have been solved for this class of enzymes, with PDB accession codes 1D2R, 1I6K, 1I6L, 1I6M, 1M83, 1MAU, 1MAW, 1MB2, 1O5T, 1R6T, 1R6U, 1ULH, 1YIA, 1YID, 2A4M, 2AKE, 2AZX, 2DR2, 2G36, 2IP1, and 2OV4.
Read more about this topic: Tryptophan—t RNA Ligase
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