title: Immobilization of His-tagged proteins on nickel-chelating nanolipoprotein particles.
abstract: Nanolipoprotein particles (NLPs) are nanometer-sized, discoidal particles that self-assemble from purified apolipoprotein and phospholipid. Their size and facile functionalization suggest potential application of NLPs as platforms for the presentation and delivery of recombinant proteins. To this end, we investigated incorporation of nickel-chelating lipids into NLPs (NiNLPs) and subsequent sequestration of polyhistidine (His)-tagged proteins. From initial lipid screens for NLP formation, the two phospholipids DMPC and DOPC were identified as suitable bulk lipids for incorporation of the nickel-chelating lipid DOGS-NTA-Ni into NLPs, and NiNLPs were successfully formed with varying amounts of DOGS-NTA-Ni. NiNLPs consisting of 10% DOGS-NTA-Ni with 90% bulk lipid (either DMPC or DOPC) were thoroughly characterized by size exclusion chromatography (SEC), non-denaturing gradient gel electrophoresis (NDGGE), and atomic force microscopy (AFM). Three different His-tagged proteins were sequestered on NiNLPs in a nickel-dependent manner, and the amount of immobilized protein was contingent on the size and composition of the NiNLP.
authors.affiliation: Chemistry, Materials, Earth, and Life Sciences, Lawrence Livermore National Laboratory, Livermore, CA 94551, USA.
authors.forename: Nicholas O
authors.initials: NO
authors.lastname: Fischer
authors.forename: Craig D
authors.initials: CD
authors.lastname: Blanchette
authors.forename: Brett A
authors.initials: BA
authors.lastname: Chromy
authors.forename: Edward A
authors.initials: EA
authors.lastname: Kuhn
authors.forename: Brent W
authors.initials: BW
authors.lastname: Segelke
authors.forename: Michele
authors.initials: M
authors.lastname: Corzett
authors.forename: Graham
authors.initials: G
authors.lastname: Bench
authors.forename: Peter W
authors.initials: PW
authors.lastname: Mason
authors.forename: Paul D
authors.initials: PD
authors.lastname: Hoeprich
mesh_terms: D001426:Bacterial Proteins / Q000737:chemistry / Q000378:metabolism*; D002614:Chelating Agents / Q000737:chemistry* / Q000378:metabolism; D006639:Histidine / Q000737:chemistry / Q000378:metabolism; D050356:Lipid Metabolism; D008055:Lipids / Q000737:chemistry*; D008074:Lipoproteins / Q000737:chemistry* / Q000378:metabolism; D053758:Nanoparticles / Q000737:chemistry*; D009532:Nickel / Q000737:chemistry* / Q000378:metabolism; D010316:Particle Size; D011485:Protein Binding; D011994:Recombinant Proteins / Q000737:chemistry / Q000378:metabolism; D015010:Yersinia pestis / Q000737:chemistry
chemical_list: D001426:Bacterial Proteins; D002614:Chelating Agents; D008055:Lipids; D008074:Lipoproteins; D011994:Recombinant Proteins; D006639:Histidine; D009532:Nickel