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61.See supplementary material at for the alignment of CalE6 complex structures (PDB entries 4Q31 and 4U1T, chains A-D) highlighting the local side-chain conformational change of Arg 253 due to D7G variation and consequent loss of intersubunit salt bridges while the overall structure is not affected.[Supplementary Material]

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CalE6 from is a (pyridoxal 5′ phosphate) PLP-dependent methionine -lyase involved in the biosynthesis of calicheamicins. We report the crystal structure of a CalE6 2-(N-morpholino)ethanesulfonic acid complex showing ligand-induced rotation of Tyr100, which stacks with PLP, resembling the corresponding tyrosine rotation of true catalytic intermediates of CalE6 homologs. Elastic network modeling and crystallographic ensemble refinement reveal mobility of the N-terminal loop, which involves both tetrameric assembly and PLP binding. Modeling and comparative structuralanalysis of PLP-dependent enzymes involved in Cys/Met metabolism shine light on the functional implications of the intrinsic dynamic properties of CalE6 in catalysis and holoenzyme maturation.


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