Mapping the conformational landscape of a dynamic enzyme by multitemperature and XFEL crystallography

ELife
Daniel A KeedyJames S Fraser

Abstract

Determining the interconverting conformations of dynamic proteins in atomic detail is a major challenge for structural biology. Conformational heterogeneity in the active site of the dynamic enzyme cyclophilin A (CypA) has been previously linked to its catalytic function, but the extent to which the different conformations of these residues are correlated is unclear. Here we compare the conformational ensembles of CypA by multitemperature synchrotron crystallography and fixed-target X-ray free-electron laser (XFEL) crystallography. The diffraction-before-destruction nature of XFEL experiments provides a radiation-damage-free view of the functionally important alternative conformations of CypA, confirming earlier synchrotron-based results. We monitored the temperature dependences of these alternative conformations with eight synchrotron datasets spanning 100-310 K. Multiconformer models show that many alternative conformations in CypA are populated only at 240 K and above, yet others remain populated or become populated at 180 K and below. These results point to a complex evolution of conformational heterogeneity between 180--240 K that involves both thermal deactivation and solvent-driven arrest of protein motions in the crysta...Continue Reading

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Related Concepts

Protein Conformation
Crystallography, X-Ray
Catalytic Domain
Cyclophilin A
Crystallography
Hydrocarbons, Aromatic
Electron Microscopy
X-Ray Diffraction
Site
Radiation Damage to Artery

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