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Applying SILAC for the differential analysis of protein complexes.
Methods Mol. Biol. 1188, 177-190 (2014)
Pull-downs based on tag fusion proteins as well as immunoprecipitations (IP) are widely used methods to analyze protein interactions. Selectivity and specificity of both methods are compromised by nonspecific binding to the capture agent or carrier beads thereby generating false positives. Here, we provide a method combining stable isotope labeling of amino acids in cell culture (SILAC) with affinity purification, coupled to quantitative tandem mass spectrometry. It permits the analysis of protein interactions with high sensitivity, while being able to discriminate contaminants and nonspecific binders. Besides pruning out contaminants, high-resolution MS data combined with quantitative proteomics software allow the comparative analysis of protein interaction patterns of different protein variants, for example mutated versus normal protein variant or of regulatory changes in a given protein complex due to different states of activity.
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Publikationstyp
Artikel: Journalartikel
Dokumenttyp
Wissenschaftlicher Artikel
Schlagwörter
Affinity Purification ; Mass Spectrometry ; Protein Complexes ; Quantitative Complex Analysis ; Sf-tap ; Silac
ISSN (print) / ISBN
1064-3745
e-ISSN
1940-6029
Zeitschrift
Methods in Molecular Biology
Quellenangaben
Band: 1188,
Seiten: 177-190
Verlag
Springer
Verlagsort
Berlin [u.a.]
Nichtpatentliteratur
Publikationen
Begutachtungsstatus
Peer reviewed