English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Journal Article

Purification of protein complexes of defined subunit stoichiometry using a set of orthogonal, tag-cleaving proteases.

MPS-Authors
/persons/resource/persons15089

Frey,  S.
Department of Cellular Logistics, MPI for biophysical chemistry, Max Planck Society;

/persons/resource/persons15132

Görlich,  D.
Department of Cellular Logistics, MPI for biophysical chemistry, Max Planck Society;

Fulltext (public)
There are no public fulltexts available
Supplementary Material (public)

1977176_Suppl.pdf
(Supplementary material), 2MB

Citation

Frey, S., & Görlich, D. (2014). Purification of protein complexes of defined subunit stoichiometry using a set of orthogonal, tag-cleaving proteases. Journal of Chromatography A, 1337, 106-115. doi:10.1016/j.chroma.2014.02.030.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0018-90DB-5
Abstract
Tag-free proteins or protein complexes represent certainly the most authentic starting points for functional or structural studies. They can be obtained by conventional multi-step chromatography from native or recombinant tag-free sources. Alternatively, they can be expressed and purified using a cleavable N-terminal affinity tag that is subsequently removed by a site-specific protease. Proteolytic tag-removal can also be performed "on-column". We show here that this not only represents a very efficient workflow, but also drastically improves the purity of the resulting protein preparations. Precondition for effective on-column-cleavage is, however, that the tag-cleaving protease does not bind the stationary phase. We introduce scAtg4 and xlUsp2 as very good and bdSENP1, bdNEDP1 as well as ssNEDP1 as ideal proteases for on-column cleavage at 4°C. Four of these proteases (bdSENP1, bdNEDP1, scAtg4, xlUsp2) as well as TEV protease display orthogonal, i.e. mutually exclusive cleavage specificities. We combined these features into a streamlined method for the production of highly pure protein complexes: Orthogonal affinity tags and protease recognitions modules are fused to individual subunits. Following co-expression or in-vitro complex assembly, consecutive cycles of affinity capture and proteolytic release then select sequentially for the presence of each orthogonally tagged subunit, yielding protein complexes of well-defined subunit stoichiometry.