Functionalization of cobalt porphyrin-phospholipid bilayers with his-tagged ligands and antigens.
Nat Chem
; 7(5): 438-46, 2015 May.
Article
in En
| MEDLINE
| ID: mdl-25901823
ABSTRACT
Methods to attach polypeptides to lipid bilayers are often indirect and ineffective, and can represent a substantial bottleneck in the formation of functionalized lipid-based materials. Although the polyhistidine tag (his-tag) has been transformative in its simplicity and efficacy in binding to immobilized metals, the successful application of this approach has been challenging in physiological settings. Here we show that lipid bilayers containing porphyrin-phospholipid conjugates that are chelated with cobalt, but not with other metals, can effectively capture his-tagged proteins and peptides. The binding follows a Co(II) to Co(III) transition and occurs within the sheltered hydrophobic bilayer, resulting in an essentially irreversible attachment in serum or in a million fold excess of competing imidazole. Using this approach we anchored homing peptides into the bilayer of preformed and cargo-loaded liposomes to enable tumour targeting without disrupting the bilayer integrity. As a further demonstration, a synthetic protein fragment derived from the human immunodeficiency virus was bound to immunogenic liposomes for potent antibody generation for an otherwise non-antigenic peptide.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Phospholipids
/
Porphyrins
/
Cobalt
/
Lipid Bilayers
Language:
En
Journal:
Nat Chem
Year:
2015
Document type:
Article