Materials and Methods Full details of all methods used are provided in SI Appendix.
ProteinPurification.BslAwaspurifiedafterexpressionasaGSTfusionprotein using standard techniques. See SI Appendix for full details.
Circular Dichroism Spectropolarimetry. CD was performed using a Jasco J-810 spectropolarimeter. Control samples were analyzed at a concentration of 0.1 mg·mL−1 (6.7 μM) in a 0.1-cm quartz cuvette. Refractive index matched emulsions were analyzed in a 0.01-cm demountable quartz cuvette. Measurementswereperformedwithascanrateof50nm·s−1,adatapitchof0.1nm, and a digital integration time of 1 s.
Pendant Drop Tensiometry. Monitoring the kinetics of BslA adsorption was achieved using pendant drop tensiometry with drop shape analysis. A Krüss Easydrop tensiometer (Krüss GmbH) was used in combination with Drop Shape Analysis software. See SI Appendix for full details.
Transmission Electron Microscopy. BslA-WT and L77K samples were deposited onto carbon-coated copper grids (Cu-grid) (TAAB Laboratories Equipment, Ltd.) and imaged using a Philips/FEI CM120 BioTwin transmission electron microscope. See SI Appendix for full details.