open access

https://hdl.handle.net/2115/76773

Crystallographic analysis of Eisenia hydrolysis-enhancing protein using a long wavelength for native-SAD phasing

英語

biofuel

2020-01

International Union of Crystallography

Acta crystallographica Section F

76

20-24

Eisenia hydrolysis-enhancing protein (EHEP), which is a novel protein that has been identified in Aplysia kurodai, protects beta-glucosidases from phlorotannin inhibition to facilitate the production of glucose from the laminarin abundant in brown algae. Hence, EHEP has attracted attention for its potential applications in producing biofuel from brown algae. In this study, EHEP was purified from the natural digestive fluid of A. kurodai and was crystallized using the sitting-drop vapor-diffusion method. Native and SAD (single-wavelength anomalous diffraction) data sets were successfully collected at resolutions of 1.20 and 2.48 angstrom using wavelengths of 1.0 and 2.1 angstrom, respectively, from crystals obtained in initial screening. The crystals belonged to space group P2(1)2(1)2(1) and contained one EHEP molecule in the asymmetric unit. All 20 S-atom sites in EHEP were located and the phases were determined by the SAD method using the S atoms in the natural protein as anomalous scatterers (native-SAD). After phase improvement, interpretable electron densities were obtained and 58% of the model was automatically built.

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