Comparison of N-terminal affinity fusion domains

effect on expression level and product heterogeneity of recombinant restriction endonuclease EcoRV

authored by: T. Oswald, W. Wende, A. Pingoud, U. Rinas
Abstract: The influence of different N-terminal affinity fusion domains on the product heterogeneity of recombinant proteins expressed in Escherichia coli was investigated. N-Terminal extended forms of the restriction endonuclease EcoRV with either glutathione-S-transferase [GST], histidine hexapeptide [(His)₆], or a combination of GST and (His)₆ [GST-(His)₆] were compared to native EcoRV with respect to expression level, susceptability to inclusion body formation and protein fragmentation. Fingerprinting of product heterogeneity was done by using two-dimensional (2-D) non equilibrium pH-gradient electrophoresis with subsequent immunoblotting. Fusion proteins containing GST were poorly expressed compared to native EcoRV. In addition, GST fusion proteins were highly susceptible to invivo aggregation and fragmentation and displayed more heterogeneity on 2-D immunoblots. However, the sole presence of oligohistidine at the N-terminus of EcoRV proved to be advantageous. Fragmentation of (His)₆-EcoRV was not observed and 2-D immunoblots did not show heterogenous forms of the recombinant protein. In addition, fusion of the histidine-hexapeptide to the N-terminus of native EcoRV increased the expression level of the recombinant protein twofold compared to native EcoRV. Inclusion body formation of the (His)₆-EcoRV fusion protein was intensive when cells were grown at 37°C but not at 30°C. The advantage of oligohistidine fusion to EcoRV was finally demonstrated by purifying soluble (His)₆-EcoRV in a single-step procedure from crude cell lysates using immobilized metal chelate affinity chromatography.
External Organisation(s): Helmholtz Centre for Infection Research (HZI)
Justus Liebig University Giessen
Type: Article
Journal: Applied Microbiology and Biotechnology
Volume: 42
Pages: 73-77
No. of pages: 5
ISSN: 0175-7598
Publication date: 10.1994
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Biotechnology, Applied Microbiology and Biotechnology
Electronic version(s): https://doi.org/10.1007/BF00170227 (Access: Closed)

BibTeX

@article{651c4531aed3491195cd12f80b070c43,
title = "Comparison of N-terminal affinity fusion domains: effect on expression level and product heterogeneity of recombinant restriction endonuclease EcoRV",
abstract = "The influence of different N-terminal affinity fusion domains on the product heterogeneity of recombinant proteins expressed in Escherichia coli was investigated. N-Terminal extended forms of the restriction endonuclease EcoRV with either glutathione-S-transferase [GST], histidine hexapeptide [(His)6], or a combination of GST and (His)6 [GST-(His)6] were compared to native EcoRV with respect to expression level, susceptability to inclusion body formation and protein fragmentation. Fingerprinting of product heterogeneity was done by using two-dimensional (2-D) non equilibrium pH-gradient electrophoresis with subsequent immunoblotting. Fusion proteins containing GST were poorly expressed compared to native EcoRV. In addition, GST fusion proteins were highly susceptible to invivo aggregation and fragmentation and displayed more heterogeneity on 2-D immunoblots. However, the sole presence of oligohistidine at the N-terminus of EcoRV proved to be advantageous. Fragmentation of (His)6-EcoRV was not observed and 2-D immunoblots did not show heterogenous forms of the recombinant protein. In addition, fusion of the histidine-hexapeptide to the N-terminus of native EcoRV increased the expression level of the recombinant protein twofold compared to native EcoRV. Inclusion body formation of the (His)6-EcoRV fusion protein was intensive when cells were grown at 37°C but not at 30°C. The advantage of oligohistidine fusion to EcoRV was finally demonstrated by purifying soluble (His)6-EcoRV in a single-step procedure from crude cell lysates using immobilized metal chelate affinity chromatography.",
author = "T. Oswald and W. Wende and A. Pingoud and U. Rinas",
year = "1994",
month = oct,
doi = "10.1007/BF00170227",
language = "English",
volume = "42",
pages = "73--77",
journal = "Applied Microbiology and Biotechnology",
issn = "0175-7598",
publisher = "Springer Verlag",
number = "1",
}