3 research outputs found
Nanopore-Based Selective Discrimination of MicroRNAs with Single-Nucleotide Difference Using Locked Nucleic Acid-Modified Probes
The
accurate discrimination of microRNAs (miRNAs) with highly similar
sequences would greatly facilitate the screening and early diagnosis
of diseases. In the present work, a locked nucleic acid (LNA)-modified
probe was designed and used for α-hemolysin (α-HL) nanopore
to selectively and specifically identify miRNAs. The hybridization
of the LNA probe with the target miRNAs generated unique long-lived
signals in the nanopore thus facilitated an accurate discrimination
of miRNAs with similar sequences, even a single-nucleotide difference.
Furthermore, the developed nanopore-based analysis with LNA probe
could selectively detect target miRNAs in a natural serum background.
This selective and sensitive approach may be highly valuable in the
detection of clinically relevant biomarkers in complex samples
Nanopore-Based Selective Discrimination of MicroRNAs with Single-Nucleotide Difference Using Locked Nucleic Acid-Modified Probes
The
accurate discrimination of microRNAs (miRNAs) with highly similar
sequences would greatly facilitate the screening and early diagnosis
of diseases. In the present work, a locked nucleic acid (LNA)-modified
probe was designed and used for α-hemolysin (α-HL) nanopore
to selectively and specifically identify miRNAs. The hybridization
of the LNA probe with the target miRNAs generated unique long-lived
signals in the nanopore thus facilitated an accurate discrimination
of miRNAs with similar sequences, even a single-nucleotide difference.
Furthermore, the developed nanopore-based analysis with LNA probe
could selectively detect target miRNAs in a natural serum background.
This selective and sensitive approach may be highly valuable in the
detection of clinically relevant biomarkers in complex samples
TtOmp85, a β‑Barrel Assembly Protein, Functions by Barrel Augmentation
Outer
membrane proteins are vital for Gram-negative bacteria and
organisms that inherited organelles from them. Proteins from the Omp85/BamA
family conduct the insertion of membrane proteins into the outer membrane.
We show that an eight-stranded outer membrane β-barrel protein,
TtoA, is inserted and folded into liposomes by an Omp85 homologue.
Furthermore, we recorded the channel conductance of this Omp85 protein
in black lipid membranes, alone and in the presence of peptides comprising
the sequence of the
two N-terminal and the two C-terminal β-strands of TtoA. Only
with the latter could a long-living compound channel that exhibits
conductance levels higher than those of the Omp85 protein alone be
observed. These data
support a model in which unfolded outer membrane protein after docking
with its C-terminus penetrates into the transmembrane β-barrel
of the Omp85 protein and augments its β-sheet at the first strand.
Augmentation with successive β-strands leads to a compound,
dilated barrel of both proteins