Abstract:
:Live cell imaging is a powerful method to study protein dynamics at the cell surface, but conventional imaging probes are bulky, or interfere with protein function, or dissociate from proteins after internalization. Here, we report technology for covalent, specific tagging of cellular proteins with chemical probes. Through rational design, we redirected a microbial lipoic acid ligase (LplA) to specifically attach an alkyl azide onto an engineered LplA acceptor peptide (LAP). The alkyl azide was then selectively derivatized with cyclo-octyne conjugates to various probes. We labeled LAP fusion proteins expressed in living mammalian cells with Cy3, Alexa Fluor 568 and biotin. We also combined LplA labeling with our previous biotin ligase labeling, to simultaneously image the dynamics of two different receptors, coexpressed in the same cell. Our methodology should provide general access to biochemical and imaging studies of cell surface proteins, using small fluorophores introduced via a short peptide tag.
journal_name
Nat Biotechnoljournal_title
Nature biotechnologyauthors
Fernández-Suárez M,Baruah H,Martínez-Hernández L,Xie KT,Baskin JM,Bertozzi CR,Ting AYdoi
10.1038/nbt1355subject
Has Abstractpub_date
2007-12-01 00:00:00pages
1483-7issue
12eissn
1087-0156issn
1546-1696pii
nbt1355journal_volume
25pub_type
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