A polymer scaffold, with multiple reactive centres, was synthesised by RAFT polymerisation and conjugated to the antibody herceptin. A hexahistidine RAFT agent enabled simple purification of polymer–protein conjugates.
Two-step activity-based protein profiling of diacylglycerol lipase
作者:Eva J. van Rooden、Roy Kreekel、Thomas Hansen、Antonius P. A. Janssen、Annelot C. M. van Esbroeck、Hans den Dulk、Richard J. B. H. N. van den Berg、Jeroen D. C. Codée、Mario van der Stelt
DOI:10.1039/c8ob01499j
日期:——
visualize endogenous DAGL activity are desired. Here, we report the design, synthesis and application of a triazole urea probe for DAGL equipped with a norbornene as a biorthogonal handle. The activity and selectivity of the probe was assessed with activity-based protein profiling. This probe was potent against endogenous DAGLα (IC50 = 5 nM) and it was successfully applied as a two-step activity-based
Live‐Cell Imaging of Sterculic Acid—a Naturally Occurring 1,2‐Cyclopropene Fatty Acid—by Bioorthogonal Reaction with Turn‐On Tetrazine‐Fluorophore Conjugates**
作者:Kristine Bertheussen、Merel van de Plassche、Thomas Bakkum、Berend Gagestein、Iakovia Ttofi、Alexi J. C. Sarris、Herman S. Overkleeft、Mario van der Stelt、Sander I. van Kasteren
DOI:10.1002/anie.202207640
日期:2022.9.19
This paper describes the use of a cyclopropene-containing oleic acid analogue for studying live cell lipid uptake by dendritic cells. The minimal oleic acid analogue is incorporated into membranes and lipoproteins, which can be studied by live cell microscopy and lipoproteomics.
In the present study, we used a nucleoside derivative 5-vinyluridine (VrU) for labeling during cell division and for tumor imaging in living mice. We demonstrated that the functional nucleoside bearing a 5-vinyl group is metabolically incorporated into cellular RNA and can be used to image RNA using a Diels–Alder reaction. The reagent allows for simultaneous and clear imaging of DNA and RNA in mammalian cells at single-cell resolution. We extended this approach to observe DNA and RNA behaviors in several basic stages of cell division. We further demonstrated that the derivative can be used for fluorescence imaging of tumor in live mice.
在本研究中,我们使用核苷衍生物 5-乙烯基尿苷(VrU)在活体小鼠的细胞分裂过程中进行标记,并用于肿瘤成像。我们证明,带有 5-乙烯基的功能性核苷可通过代谢结合到细胞 RNA 中,并可通过 Diels-Alder 反应对 RNA 进行成像。这种试剂能以单细胞分辨率对哺乳动物细胞中的 DNA 和 RNA 同时进行清晰成像。我们扩展了这种方法,以观察细胞分裂几个基本阶段中 DNA 和 RNA 的行为。我们进一步证明,该衍生物可用于活体小鼠肿瘤的荧光成像。