Quantitative proteomic approach to study subcellular localization of membrane proteins

Sadowski, Pawel G., Dunkley, Tom P. J., Shadforth, Ian P., Dupree, Paul, Bessant, Conrad, Griffin, Julian L., & Lilley, Kathryn S. (2006) Quantitative proteomic approach to study subcellular localization of membrane proteins. Nature Protocols, 1(4), pp. 1778-1789.

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As proteins within cells are spatially organized according to their role, knowledge about protein localization gives insight into protein function. Here, we describe the LOPIT technique (localization of organelle proteins by isotope tagging) developed for the simultaneous and confident determination of the steady-state distribution of hundreds of integral membrane proteins within organelles. The technique uses a partial membrane fractionation strategy in conjunction with quantitative proteomics. Localization of proteins is achieved by measuring their distribution pattern across the density gradient using amine-reactive isotope tagging and comparing these patterns with those of known organelle residents. LOPIT relies on the assumption that proteins belonging to the same organelle will co-fractionate. Multivariate statistical tools are then used to group proteins according to the similarities in their distributions, and hence localization without complete centrifugal separation is achieved. The protocol requires approximately 3 weeks to complete and can be applied in a high-throughput manner to material from many varied sources.

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56 citations in Scopus
54 citations in Web of Science®
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ID Code: 65595
Item Type: Journal Article
Refereed: Yes
DOI: 10.1038/nprot.2006.254
ISSN: 1750-2799
Divisions: Current > Institutes > Institute for Future Environments
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Deposited On: 02 Jan 2014 02:33
Last Modified: 22 Apr 2015 23:03

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