Probing the Mycobacterial Trehalome with Bioorthogonal Chemistry
作者:Benjamin M. Swarts、Cynthia M. Holsclaw、John C. Jewett、Marina Alber、Douglas M. Fox、M. Sloan Siegrist、Julie A. Leary、Rainer Kalscheuer、Carolyn R. Bertozzi
DOI:10.1021/ja3062419
日期:2012.10.3
Mycobacteria, including the pathogen Mycobacterium tuberculosis, use the non-mammalian disaccharide trehalose as a precursor for essential cell-wall glycolipids and other metabolites. Here we describe a strategy for exploiting trehalose metabolic pathways to labelglycolipids in mycobacteria with azide-modified trehalose (TreAz) analogues. Subsequent bioorthogonal ligation with alkyne-functionalized
A Fluorogenic Trehalose Probe for Tracking Phagocytosed <i>Mycobacterium tuberculosis</i>
作者:Tingting Dai、Jinghang Xie、Qihua Zhu、Mireille Kamariza、Ke Jiang、Carolyn R. Bertozzi、Jianghong Rao
DOI:10.1021/jacs.0c07700
日期:2020.9.9
Tuberculosis (TB) disease is a global epidemic caused by the pathogenic Mycobacterium tuberculosis (Mtb). Tools that can track the replication status of viable Mtb cells within macrophages are vital for the elucidation of host-pathogen interactions. Here, we present a cephalosphorinase-dependent green trehalose (CDG-Tre) fluorogenic probe that enables fluorescence labeling of single live Bacille Calmette-Guerin (BCG) cells within macrophages at concentrations as low as 2 mu M. CDG-Tre fluoresces upon activation by BlaC, the beta-lactamase uniquely expressed by Mtb, and the fluorescent product is subsequently incorporated within the bacterial cell wall via trehalose metabolic pathway. CDG-Tre showed high selectivity for mycobacteria over other clinically prevalent species in the Corynebacterineae suborder. The unique labeling strategy of BCG by CDG-Tre provides a versatile tool for tracking Mtb in both pre- and postphagocytosis and elucidating fundamental physiological and pathological processes related to the mycomembrane.