Journal
SCIENTIFIC REPORTS
Volume 11, Issue 1, Pages -Publisher
NATURE RESEARCH
DOI: 10.1038/s41598-021-84329-z
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Funding
- Wyss Institute for Biologically Inspired Engineering
- Leopoldina Research Fellowship from the German National Academy of Sciences Leopoldina [LPDS 2014-05]
- NIH [1R35GM133325]
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Researchers characterized and engineered TP-shell interactions in two encapsulin systems, revealing variation in binding specificity and strength of TPs, influenced by hydrophobic and ionic interactions as well as TP flexibility. They designed a set of TPs with predicted binding strengths and experimentally characterized them, creating a toolbox for future nanoreactor engineering to control cargo loading efficiency and the relative stoichiometry of multiple loaded cargo proteins.
Encapsulins are recently discovered protein compartments able to specifically encapsulate cargo proteins in vivo. Encapsulation is dependent on C-terminal targeting peptides (TPs). Here, we characterize and engineer TP-shell interactions in the Thermotoga maritima and Myxococcus xanthus encapsulin systems. Using force-field modeling and particle fluorescence measurements we show that TPs vary in native specificity and binding strength, and that TP-shell interactions are determined by hydrophobic and ionic interactions as well as TP flexibility. We design a set of TPs with a variety of predicted binding strengths and experimentally characterize these designs. This yields a set of TPs with novel binding characteristics representing a potentially useful toolbox for future nanoreactor engineering aimed at controlling cargo loading efficiency and the relative stoichiometry of multiple concurrently loaded cargo proteins.
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