Comparison of classical and affinity purification techniques of Mason-Pfizer monkey virus capsid protein: the alteration of the product by an affinity tag
Language English Country United States Media print
Document type Comparative Study, Journal Article, Research Support, Non-U.S. Gov't
PubMed
11570848
DOI
10.1006/prep.2001.1488
PII: S1046592801914883
Knihovny.cz E-resources
- MeSH
- Inclusion Bodies drug effects ultrastructure MeSH
- Chromatography, Affinity methods standards MeSH
- Microscopy, Electron MeSH
- Endopeptidases genetics metabolism MeSH
- Histidine pharmacology MeSH
- Capsid genetics isolation & purification metabolism MeSH
- Cloning, Molecular MeSH
- Mason-Pfizer monkey virus chemistry MeSH
- Recombinant Fusion Proteins genetics isolation & purification metabolism MeSH
- Solubility MeSH
- Binding Sites MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
- Comparative Study MeSH
- Names of Substances
- Endopeptidases MeSH
- Histidine MeSH
- Recombinant Fusion Proteins MeSH
The efficiencies of different procedures for purification of the capsid protein (CA) of Mason-Pfizer monkey virus are compared. Plasmids encoding both wild-type CA and two C-terminally modified sequences of CA suitable for affinity chromatography purification were prepared. CA was expressed in Escherichia coli (i) as a wild-type protein, (ii) C-terminally extended with a six-histidine tag (CA 6His), and (iii) as a protein containing a C-terminal fusion to a viral protease cleavage site followed by a six-histidine tag (CA 6aa6His). Electron microscopy was used for comparison of the resulting proteins, as CA is a structural protein with no enzymatic activity. We have found that these C-terminal fusions dramatically influenced the properties and morphology of structures formed by CA protein in E. coli. The formation of amorphous aggregates of CA was abolished and CA 6His and CA 6aa6His proteins formed organized structures. CA and CA 6aa6His accumulated in bacteria in inclusion bodies as insoluble proteins, CA 6His was found in a soluble form. Both six-histidine-tagged proteins were purified using affinity chromatography under either native (CA 6His) or denaturing (CA 6aa6His) conditions. CA protein was purified under denaturing conditions using gel-filtration chromatography followed by refolding. All proteins were obtained at a purity >98%. Both aforementioned C-terminal extensions led to dramatic changes in behavior of the products and they also affected the tendency to form organized structures within E. coli. We show here that the widely used histidine anchor may significantly alter the properties of the protein of interest.
References provided by Crossref.org
Nucleic Acid Binding by Mason-Pfizer Monkey Virus CA Promotes Virus Assembly and Genome Packaging
Role of Mason-Pfizer monkey virus CA-NC spacer peptide-like domain in assembly of immature particles
The G-patch domain of Mason-Pfizer monkey virus is a part of reverse transcriptase
