Abstract
Production of sufficient amounts of human proteins is a frequent bottleneck in structural biology. Here we describe an Escherichia coli-based cell-free system which yields mg-quantities of human proteins in N-terminal fusion constructs with the GB1 domain, which show significantly increased translation efficiency. A newly generated E. coli BL21 (DE3) RIPL-Star strain was used, which contains a variant RNase E with reduced activity and an excess of rare-codon tRNAs, and is devoid of lon and ompT protease activity. In the implementation of the expression system we used freshly in-house prepared cell extract. Batch-mode cell-free expression with this setup was up to twofold more economical than continuous-exchange expression, with yields of 0.2–0.9 mg of purified protein per mL of reaction mixture. Native folding of the proteins thus obtained is documented with 2D [15N,1H]-HSQC NMR.
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Abbreviations
- 2-ME:
-
β-Mercaptoethanol
- BMCF:
-
Batch mode cell-free
- bp:
-
Base pairs
- CECF:
-
Continuous-exchange cell-free
- kDa:
-
Kilo-Dalton
- DEPC:
-
Diethylpyrocarbonate
- DHFR:
-
Dihydrofolate reductase
- DTT:
-
Dithiothreitol
- EDTA:
-
Ethylenediaminetetraacetic acid
- FABP4:
-
Adipocyte fatty acid-binding protein 4
- FKBP:
-
Human peptidyl-prolyl cis–trans isomerase FKBP1A
- GB1:
-
B1 domain of protein G from Streptococcus sp
- GILT:
-
γ-Interferon-inducible lysosomal thiol reductase
- HSQC:
-
Heteronuclear single quantum coherence
- IPTG:
-
Isopropyl-β-D-thiogalactopyranoside
- LB:
-
Luria Bertani
- MMCE:
-
Mitochondrial methylmalonyl-CoA epimerase
- MTHFS:
-
Methenyl-THF synthetase
- OAc:
-
Acetate
- PBS:
-
Phosphate-buffered saline
- PCP2H:
-
Purkinje cell protein 2 homolog
- ppiB:
-
Peptidyl-prolyl cis–trans isomerase B
- PYG:
-
Phosphate/yeast extract/glucose
- SDS-PAGE:
-
Sodium dodecyl-sulfate polyacrylamide gel electrophoresis
- SF20:
-
Stromal cell-derived growth factor
- T7 RNAP:
-
RNA polymerase from bacteriophage T7
- TBS:
-
Tris-buffered saline
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Acknowledgments
We thank Cristina Stocker for help with cell extract preparations, Dr. Arthur Horwich for providing the pET21-DHFR plasmid, Dr. Eilika Weber-Ban for providing the pET19-TEV plasmid, and the Swiss National Science Foundation and the ETH Zürich for financial support through the National Center of Competence in Research (NCCR) Structural Biology.
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Michel, E., Wüthrich, K. High-yield Escherichia coli-based cell-free expression of human proteins. J Biomol NMR 53, 43–51 (2012). https://doi.org/10.1007/s10858-012-9619-4
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DOI: https://doi.org/10.1007/s10858-012-9619-4