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Conformational flexibility of the β2a-β2b loop. The apo form is superposed on the acylated LmPBPD2 (cefotaxime bound; molecule F). The apo form is colored in gray, and the acylated structure is colored in cyan; both structures are shown as a ribbon model. The cefotaxime molecule is shown as a stick model with green C atoms. The loop residue Val94, which causes a steric hindrance with cefotaxime, is presented as a stick model.
