Phase transitions as intermediate steps in the formation of molecularly engineered protein fibers

Loading...
Thumbnail Image
Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
This publication is imported from Aalto University research portal.
View publication in the Research portal
View/Open full text file from the Research portal
Date
2018
Major/Subject
Mcode
Degree programme
Language
en
Pages
Series
Communications Biology, Volume 1
Abstract
A central concept in molecular bioscience is how structure formation at different length scales is achieved. Here we use spider silk protein as a model to design new recombinant proteins that assemble into fibers. We made proteins with a three-block architecture with folded globular domains at each terminus of a truncated repetitive silk sequence. Aqueous solutions of these engineered proteins undergo liquid–liquid phase separation as an essential pre-assembly step before fibers can form by drawing in air. We show that two different forms of phase separation occur depending on solution conditions, but only one form leads to fiber assembly. Structural variants with one-block or two block architectures do not lead to fibers. Fibers show strong adhesion to surfaces and self-fusing properties when placed into contact with each other. Our results show a link between protein architecture and phase separation behavior suggesting a general approach for understanding protein assembly from dilute solutions into functional structures.
Description
Keywords
Other note
Citation
Mohammadi , P , Aranko , A S , Lemetti , L , Cenev , Z , Zhou , Q , Virtanen , S , Landowski , C P , Penttilä , M , Fischer , W J , Wagermaier , W & Linder , M 2018 , ' Phase transitions as intermediate steps in the formation of molecularly engineered protein fibers ' , Communications Biology , vol. 1 , 86 . https://doi.org/10.1038/s42003-018-0090-y