Journal
BIOMACROMOLECULES
Volume 13, Issue 3, Pages 676-682Publisher
AMER CHEMICAL SOC
DOI: 10.1021/bm201509b
Keywords
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Funding
- Thomas F. Jeffress and Kate Miller Jeffress Memorial Trust [J-1012]
- EPSRC
- AFOSR [FA9550-09-1-0111]
- ERC [SP2-GA-2008-233409]
- EPSRC [EP/F021860/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/F021860/1] Funding Source: researchfish
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Noncontact mode atomic force microscopy was used to investigate native silk proteins prepared in different ways. Low protein concentrations revealed that single protein molecules exhibit a simple, round shape with apparent diameters of 20-25 nm. Shearing the native protein solutions after extraction from the gland and prior to drying led to a beads-on-a-string assembly at the nanometer scale. Protein concentration had a significant effect on the morphology of the protein assemblies. At higher protein concentrations, shear-induced alignment into nanofibrils was observed, while lower concentrations lead to the formation of much thinner fibrils with a width of about 8 nm.
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