Azide-reactive liposome for chemoselective and biocompatible liposomal surface functionalization and glyco-liposomal microarray fabrication

Langmuir. 2011 Nov 1;27(21):13097-103. doi: 10.1021/la2032434. Epub 2011 Oct 7.

Abstract

Chemically selective liposomal surface functionalization and liposomal microarray fabrication using azide-reactive liposomes are described. First, liposome carrying PEG-triphenylphosphine was prepared for Staudinger ligation with azide-containing biotin, which was conducted in PBS buffer (pH 7.4) at room temperature without a catalyst. Then, immobilization and microarray fabrication of the biotinylated liposome onto a streptavidin-modified glass slide via the specific streptavidin/biotin interaction were investigated by comparing with directly formed biotin-liposome, which was prepared by the conventional liposome formulation of lipid-biotin with all other lipid components. Next, the covalent microarray fabrication of liposome carrying triphenylphosphine onto an azide-modified glass slide and its further glyco-modification with azide-containing carbohydrate were demonstrated for glyco-liposomal microarray fabrication via Staudinger ligation. Fluorescence imaging confirmed the successful immobilization and protein binding of the intact immobilized liposomes and arrayed glyco-liposomes. The azide-reactive liposome provides a facile strategy for membrane-mimetic glyco-array fabrication, which may find important biological and biomedical applications such as studying carbohydrate-protein interactions and toxin and antibody screening.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Azides / chemistry*
  • Biomimetic Materials / chemistry
  • Biotinylation
  • Carbohydrates / chemistry*
  • Coated Materials, Biocompatible / chemistry*
  • Glass / chemistry
  • Liposomes / chemistry*
  • Microarray Analysis / methods*
  • Microtechnology / methods*
  • Organophosphorus Compounds / chemistry
  • Printing
  • Substrate Specificity
  • Surface Properties

Substances

  • Azides
  • Carbohydrates
  • Coated Materials, Biocompatible
  • Liposomes
  • Organophosphorus Compounds
  • triphenylphosphine