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A unique method is described for directly observing the lateral organization of a membrane protein (bacterial light-harvesting complex LH2) in a supported lipid bilayer using total internal reflection fluorescence (TIRF) microscopy. The supported lipid bilayer consisted of anionic 1,2-dioleoyl-sn-glycero-3-[phospho-rac-(1'-glycerol)] (DOPG) and(More)
A polyhistidine (His) tag was fused to the C- or N-terminus of the light-harvesting (LH1)-α chain of the photosynthetic antenna core complex (LH1-RC) from Rhodobacter sphaeroides to allow immobilization of the complex on a solid substrate with defined orientation. His-tagged LH1-RCs were adsorbed onto a gold electrode modified with Ni-NTA. The LH1-RC with(More)
Light-harvesting antenna core (LH1-RC) complexes isolated from Rhodospirillum rubrum and Rhodopseudomonas palustris were successfully self-assembled on an ITO electrode modified with 3-aminopropyltriethoxysilane. Near infra-red (NIR) absorption, fluorescence, and IR spectra of these LH1-RC complexes indicated that these LH1-RC complexes on the electrode(More)
A series of cysteine-bearing hydrophobic polypeptides analogous to a light-harvesting one betapolypeptide (LH1beta) from the LH1 complex from the purple photosynthetic bacterium, Rhodobacter sphaeroides, was synthesized using an Escherichia coli expression system. The cysteine was placed in the C- or N-terminal regions of the polypeptide to investigate the(More)
Light-harvesting antenna core (LH1-RC) complexes isolated from Rhodoseudomonas palustris were self-assembled on a gold electrode modified with self-assembled monolayers (SAMs) of the alkanethiols NH2(CH2)nSH, n = 2, 6, 8, 11; HOOC(CH2)7SH; and CH3(CH2)7SH, respectively. Adsorption of the LH1-RC complexes on the SAMs depended on the terminating group of the(More)
To develop a novel nonviral gene carrier, three types of polyamine-dialkyl phosphates conjugates were synthesized via an unprecedented synthetic intermediate, dimerized dicetyl phosphate (DCP) anhydride, and the transfection efficiency and the complexation properties of the conjugate-DNA were evaluated. Condensation of DCP by(More)
The subunit light-harvesting 1 (LH 1) complexes isolated from photosynthetic bacteria Rhodospirillum rubrum using n-octyl-beta-glucoside were reassociated and adsorbed on a mica substrate using spin-coat methods with the aim of using this LH complex in a nanodevice. The near-IR absorption and fluorescence spectra of the LH 1 complexes indicated that the LH(More)
Synthetic cationic lipids are promising transfection agents for gene therapy. We report here that polyamine conjugates of dialkyl phosphates, combined with natural lipids and assembled in the form of liposomes (polycationic liposome: PCL), possess high transfection activity in the COS-1 cell line. Furthermore, we describe the functional morphology of the(More)
The conductivity of a photosynthetic reaction center (RC) from Rhodobacter sphaeroides was measured with conductive atomic force microscopy (CAFM) on SAM-modified Au(111) substrates. 2-mercaptoethanol (2ME), 2-mercaptoacetic acid (MAC), 2-mercaptopyridine (2MP) and 4-mercaptopyridine (4MP) were prepared as SAM materials to investigate the stability and(More)
The effect of volatile anesthetics, halothane, isoflurane, and enflurane on reconstituted light-harvesting 1 complex (LH1) with zinc substituted bacteriochlorophyll a (ZnBChl a) (LH1/ ZnBChl a complex) assembled in n-octyl-h-glucopyranoside (OG) micelle and lipid bilayers was examined. Interestingly, the effect of volatile anesthetics depended on the(More)