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Title: A practical method for efficient and optimal production of Seleno‐methionine‐labeled recombinant protein complexes in the insect cells

Abstract

Abstract The use of Seleno‐methionine (SeMet) incorporated protein crystals for single or multi‐wavelength anomalous diffraction (SAD or MAD) to facilitate phasing has become almost synonymous with modern X‐ray crystallography. The anomalous signals from SeMets can be used for phasing as well as sequence markers for subsequent model building. The production of large quantities of SeMet incorporated recombinant proteins is relatively straightforward when expressed in Escherichia coli . In contrast, production of SeMet substituted recombinant proteins expressed in the insect cells is not as robust due to the toxicity of SeMet in eukaryotic systems. Previous protocols for SeMet‐incorporation in the insect cells are laborious, and more suited for secreted proteins. In addition, these protocols have generally not addressed the SeMet toxicity issue, and typically result in low recovery of the labeled proteins. Here we report that SeMet toxicity can be circumvented by fully infecting insect cells with baculovirus. Quantitatively controlling infection levels using our Titer Estimation of Quality Control (TEQC) method allow for the incorporation of substantial amounts of SeMet, resulting in an efficient and optimal production of labeled recombinant protein complexes. With the method described here, we were able to consistently reach incorporation levels of about 75% and protein yieldmore » of 60–90% compared with native protein expression.« less

Authors:
 [1];  [1]; ORCiD logo [1]
  1. Department of Biochemistry and Molecular Biology Indiana University School of Medicine 635 Barnhill Drive, Indianapolis, Indiana 46202
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1493371
Resource Type:
Publisher's Accepted Manuscript
Journal Name:
Protein Science
Additional Journal Information:
Journal Name: Protein Science Journal Volume: 28 Journal Issue: 4; Journal ID: ISSN 0961-8368
Publisher:
Wiley Blackwell (John Wiley & Sons)
Country of Publication:
United Kingdom
Language:
English

Citation Formats

Wenzel, Sabine, Imasaki, Tsuyoshi, and Takagi, Yuichiro. A practical method for efficient and optimal production of Seleno‐methionine‐labeled recombinant protein complexes in the insect cells. United Kingdom: N. p., 2019. Web. doi:10.1002/pro.3575.
Wenzel, Sabine, Imasaki, Tsuyoshi, & Takagi, Yuichiro. A practical method for efficient and optimal production of Seleno‐methionine‐labeled recombinant protein complexes in the insect cells. United Kingdom. https://doi.org/10.1002/pro.3575
Wenzel, Sabine, Imasaki, Tsuyoshi, and Takagi, Yuichiro. Mon . "A practical method for efficient and optimal production of Seleno‐methionine‐labeled recombinant protein complexes in the insect cells". United Kingdom. https://doi.org/10.1002/pro.3575.
@article{osti_1493371,
title = {A practical method for efficient and optimal production of Seleno‐methionine‐labeled recombinant protein complexes in the insect cells},
author = {Wenzel, Sabine and Imasaki, Tsuyoshi and Takagi, Yuichiro},
abstractNote = {Abstract The use of Seleno‐methionine (SeMet) incorporated protein crystals for single or multi‐wavelength anomalous diffraction (SAD or MAD) to facilitate phasing has become almost synonymous with modern X‐ray crystallography. The anomalous signals from SeMets can be used for phasing as well as sequence markers for subsequent model building. The production of large quantities of SeMet incorporated recombinant proteins is relatively straightforward when expressed in Escherichia coli . In contrast, production of SeMet substituted recombinant proteins expressed in the insect cells is not as robust due to the toxicity of SeMet in eukaryotic systems. Previous protocols for SeMet‐incorporation in the insect cells are laborious, and more suited for secreted proteins. In addition, these protocols have generally not addressed the SeMet toxicity issue, and typically result in low recovery of the labeled proteins. Here we report that SeMet toxicity can be circumvented by fully infecting insect cells with baculovirus. Quantitatively controlling infection levels using our Titer Estimation of Quality Control (TEQC) method allow for the incorporation of substantial amounts of SeMet, resulting in an efficient and optimal production of labeled recombinant protein complexes. With the method described here, we were able to consistently reach incorporation levels of about 75% and protein yield of 60–90% compared with native protein expression.},
doi = {10.1002/pro.3575},
journal = {Protein Science},
number = 4,
volume = 28,
place = {United Kingdom},
year = {Mon Feb 04 00:00:00 EST 2019},
month = {Mon Feb 04 00:00:00 EST 2019}
}

Journal Article:
Free Publicly Available Full Text
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https://doi.org/10.1002/pro.3575

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