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2D 13C -13C correlation NMR spectrum with τmix = 150 ms of U-13C/15N-proline enriched Latrodectus hesperus major silk provides intramolecular correlations. The chemical shifts for each proline resonance is observed. Three correlations are observed between Ala Cβ-Ala Cα (20.4 / 48.6 ppm, 17.0 / 49.4 ppm 16.4 / 52.4 ppm), indicating that Ala is incorporated into three distinct structural environments.
