Journal
ACS CHEMICAL BIOLOGY
Volume 11, Issue 7, Pages 2033-2040Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acschembio.5b01032
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Funding
- National Natural Science Foundation of China [21174022, 21376038, 21421005]
- National Basic Research Program of China [2013CB733702]
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By connection of O-6-benzylguanine (BG) to an o-phenylenediamine-locked rhodamine spirolactam responsive to nitric oxide (NO), a novel substrate (TMR-NO-BG) of genetically encoded SNAP-tag has been constructed. In living cells, labeling SNAP-tag fused proteins with TMR-NO-BG will in situ generate corresponding probe protein conjugates (TMR-NO-SNAP) that not only inherit high NO sensitivity from the small-molecule parent but also guarantee the site-specificity to the designated subcellular compartments such as the mitochondrial inner membrane, nucleus, and cytoplasm. In two representative cellular processes, TMR-NO-BG demonstrates its applicability to monitor endogenous subcellular NO in the activated RAW264.7 cells stimulated by lipopolysaccharide and in the apoptotic COS-7 cells induced by etoposide.
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