5 research outputs found
Bicyclic enol cyclocarbamates inhibit penicillin-binding proteins
Natural products form attractive leads for the development of chemical probes and drugs. The antibacterial lipopeptide Brabantamide A contains an unusual enol cyclocarbamate and we used this scaffold as inspiration for the synthesis of a panel of enol cyclocarbamate containing compounds. By equipping the scaffold with different groups, we identified structural features that are essential for antibacterial activity. Some of the derivatives block incorporation of hydroxycoumarin carboxylic acid-amino d-alanine into the newly synthesized peptidoglycan. Activity-based protein-profiling experiments revealed that the enol carbamates inhibit a specific subset of penicillin-binding proteins in B. subtilis and S. pneumoniae
Use of 18F-2-Fluorodeoxyglucose to Label Antibody Fragments for Immuno-Positron Emission Tomography of Pancreatic Cancer
We generated 18F-labeled antibody fragments for positron emission tomography (PET) imaging using a sortase-mediated reaction to install a trans-cyclooctene-functionalized short peptide onto proteins of interest, followed by reaction with a tetrazine-labeled-18F-2-deoxyfluoroglucose (FDG). The method is rapid, robust, and site-specific (radiochemical yields > 25%, not decay corrected). The availability of 18F-2-deoxyfluoroglucose avoids the need for more complicated chemistries used to generate carbonâfluorine bonds. We demonstrate the utility of the method by detecting heterotopic pancreatic tumors in mice by PET, using anti-Class II MHC single domain antibodies. We correlate macroscopic PET images with microscopic two-photon visualization of the tumor. Our approach provides easy access to 18F-labeled antibodies and their fragments at a level of molecular specificity that complements conventional 18F-FDG imaging
Use of <sup>18</sup>Fâ2-Fluorodeoxyglucose to Label Antibody Fragments for Immuno-Positron Emission Tomography of Pancreatic Cancer
We
generated <sup>18</sup>F-labeled antibody fragments for positron
emission tomography (PET) imaging using a sortase-mediated reaction
to install a <i>trans</i>-cyclooctene-functionalized short
peptide onto proteins of interest, followed by reaction with a tetrazine-labeled-<sup>18</sup>F-2-deoxyfluoroglucose (FDG). The method is rapid, robust,
and site-specific (radiochemical yields > 25%, not decay corrected).
The availability of <sup>18</sup>F-2-deoxyfluoroglucose avoids the
need for more complicated chemistries used to generate carbonâfluorine
bonds. We demonstrate the utility of the method by detecting heterotopic
pancreatic tumors in mice by PET, using anti-Class II MHC single domain
antibodies. We correlate macroscopic PET images with microscopic two-photon
visualization of the tumor. Our approach provides easy access to <sup>18</sup>F-labeled antibodies and their fragments at a level of molecular
specificity that complements conventional <sup>18</sup>F-FDG imaging
Use of <sup>18</sup>Fâ2-Fluorodeoxyglucose to Label Antibody Fragments for Immuno-Positron Emission Tomography of Pancreatic Cancer
We
generated <sup>18</sup>F-labeled antibody fragments for positron
emission tomography (PET) imaging using a sortase-mediated reaction
to install a <i>trans</i>-cyclooctene-functionalized short
peptide onto proteins of interest, followed by reaction with a tetrazine-labeled-<sup>18</sup>F-2-deoxyfluoroglucose (FDG). The method is rapid, robust,
and site-specific (radiochemical yields > 25%, not decay corrected).
The availability of <sup>18</sup>F-2-deoxyfluoroglucose avoids the
need for more complicated chemistries used to generate carbonâfluorine
bonds. We demonstrate the utility of the method by detecting heterotopic
pancreatic tumors in mice by PET, using anti-Class II MHC single domain
antibodies. We correlate macroscopic PET images with microscopic two-photon
visualization of the tumor. Our approach provides easy access to <sup>18</sup>F-labeled antibodies and their fragments at a level of molecular
specificity that complements conventional <sup>18</sup>F-FDG imaging
Use of <sup>18</sup>Fâ2-Fluorodeoxyglucose to Label Antibody Fragments for Immuno-Positron Emission Tomography of Pancreatic Cancer
We
generated <sup>18</sup>F-labeled antibody fragments for positron
emission tomography (PET) imaging using a sortase-mediated reaction
to install a <i>trans</i>-cyclooctene-functionalized short
peptide onto proteins of interest, followed by reaction with a tetrazine-labeled-<sup>18</sup>F-2-deoxyfluoroglucose (FDG). The method is rapid, robust,
and site-specific (radiochemical yields > 25%, not decay corrected).
The availability of <sup>18</sup>F-2-deoxyfluoroglucose avoids the
need for more complicated chemistries used to generate carbonâfluorine
bonds. We demonstrate the utility of the method by detecting heterotopic
pancreatic tumors in mice by PET, using anti-Class II MHC single domain
antibodies. We correlate macroscopic PET images with microscopic two-photon
visualization of the tumor. Our approach provides easy access to <sup>18</sup>F-labeled antibodies and their fragments at a level of molecular
specificity that complements conventional <sup>18</sup>F-FDG imaging