Abstract:
:Super-resolution fluorescence microscopy, specifically stochastic reconstruction microscopy (STORM), and atomic force microscopy (AFM) were used to image the self-assembly processes of the peptide surfactant I3K. The peptide surfactants self-assembled into giant helical fibrils with diameters between 5 and 10 nm with significant helical twisting. The resolution of the STORM images was 30 nm, calculated using the Fourier ring correlation method. STORM compares favorably with AFM for the calculation of contour lengths (∼6 μm) and persistence lengths (10.1 ± 1.2 μm) due to its increased field of view (50 μm), and its ability to image bulk morphologies away from surfaces under ambient solution conditions. Two-color STORM experiments were performed to investigate the dynamic process of self-assembly after mixing of two separately labeled samples, and the results revealed the formation of long nanofibers via end-to-end connections of short ones. No evidence was found for significant monomer exchange between the samples, and the self-assembled structures were very stable and long-lived.
journal_name
Biomacromoleculesjournal_title
Biomacromoleculesauthors
Cox H,Georgiades P,Xu H,Waigh TA,Lu JRdoi
10.1021/acs.biomac.7b00465subject
Has Abstractpub_date
2017-11-13 00:00:00pages
3481-3491issue
11eissn
1525-7797issn
1526-4602journal_volume
18pub_type
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