Abstract：
:A big challenge in proteomics is the identification of cell-type-specific proteomes in vivo. This protocol describes how to label, purify and identify cell-type-specific proteomes in living mice. To make this possible, we created a Cre-recombinase-inducible mouse line expressing a mutant methionyl-tRNA synthetase (L274G), which enables the labeling of nascent proteins with the non-canonical amino acid azidonorleucine (ANL). This amino acid can be conjugated to different affinity tags by click chemistry. After affinity purification (AP), the labeled proteins can be identified by tandem mass spectrometry (MS/MS). With this method, it is possible to identify cell-type-specific proteomes derived from living animals, which was not possible with any previously published method. The reduction in sample complexity achieved by this protocol allows for the detection of subtle changes in cell-type-specific protein content in response to environmental changes. This protocol can be completed in ~10 d (plus the time needed to generate the mouse lines, the desired labeling period and MS analysis).
journal_name
Nat Protocjournal_title
Nature protocolsauthors
Alvarez-Castelao B,Schanzenbächer CT,Langer JD,Schuman EMdoi
10.1038/s41596-018-0106-6subject
Has Abstractpub_date
2019-02-01 00:00:00pages
556-575issue
2eissn
1754-2189issn
1750-2799pii
10.1038/s41596-018-0106-6journal_volume
14pub_type
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