Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 36, Pages 19804-19812Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202105527
Keywords
antibodies; intracellular delivery; liquid droplet; liquid-liquid phase separation (LLPS); peptides
Categories
Funding
- JSPS KAKENHI [JP18H04017, JP20H04707, JP21H04794]
- JST CREST [JPMJCR18H5]
- JSPS Research Fellowship for Young Scientists
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The Fc region binding peptide can assist in delivering immunoglobulin G into cells, forming particle-like liquid droplets; upon contact with the cellular membrane, the droplets spontaneously enter cells and distribute throughout; translocation of IgG is achieved through involvement of cellular machinery and membrane ruffling.
Fc region binding peptide conjugated with attenuated cationic amphiphilic lytic peptide L17E trimer [FcB(L17E)(3)] was designed for immunoglobulin G (IgG) delivery into cells. Particle-like liquid droplets were generated by mixing Alexa Fluor 488 labeled IgG (Alexa488-IgG) with FcB(L17E)(3). Droplet contact with the cellular membrane led to spontaneous influx and distribution of Alexa488-IgG throughout cells in serum containing medium. Involvement of cellular machinery accompanied by actin polymerization and membrane ruffling was suggested for the translocation. Alexa488-IgG negative charges were crucial in liquid droplet formation with positively charged FcB(L17E)(3). Binding of IgG to FcB(L17E)(3) may not be necessary. Successful intracellular delivery of Alexa Fluor 594-labeled anti-nuclear pore complex antibody and anti-mCherry-nanobody tagged with supernegatively charged green fluorescence protein allowed binding to cellular targets in the presence of FcB(L17E)(3).
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