Fig. 4 | Nature Communications

Fig. 4

From: Protein and RNA dynamical fingerprinting

Fig. 4

PV-ATM sensitivity to inhibitor binding. a CEWL; b CEWL-3NAG crystal 1, and c CEWL-3NAG crystal 2. The spectra is reproducible crystal to crystal. ATM measurements are shown for comparison (d) CEWL and e CEWL-3NAG. The simpler and faster PV-ATM technique provides spectra with increased structure over the ATM method. For the PV-ATM results solid circles indicate spectral features that are present in free CEWL and absent in inhibitor bound CEWL. Dashed circles indicate features present for inhibitor bound CEWL and absent for free CEWL. These are offset by 180° from the solid circles since all features have 180° periodicity from the regular alignment of the molecules. The large changes with inhibitor binding indicate the features arise from intramolecular vibrations and not crystal phonons. The crystal phonons are dependent on the intermolecular surface contacts and molecular mass, which change only slightly with binding as indicated by the X-ray structures for f free (1bwh.pdb) and for g inhibitor bound (1hew.pdb)

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