Purification of a recombinant membrane protein tagged with a calmodulin-binding domain: properties of chimeras of the Escherichia coli nicotinamide nucleotide transhydrogenase and the C-terminus of human plasma membrane Ca2+ -ATPase.
Journal article, 2004
A Ca2+ -dependent calmodulin-binding peptide (CBP) is an attractive tag for affinity purification of recombinant proteins, especially membrane proteins, since elution is simply accomplished by removing/chelating Ca2+. To develop a single-step calmodulin/CBP-dependent purification procedure for Escherichia coli nicotinamide nucleotide transhydrogenase, a 49 amino acid large CBP or a larger 149 amino acid C-terminal fragment of human plasma membrane Ca2+ -ATPase (hPMCA) was fused C-terminally to the beta subunit of transhydrogenase. Fusion using the 49 amino acid fragment resulted in a dramatic loss of transhydrogenase expression while fusion with the 149 amino acid fragment gave a satisfactory expression. This chimeric protein was purified by affinity chromatography on calmodulin-Sepharose with mild elution with EDTA. The purity and activity were comparable to those obtained with His-tagged transhydrogenase and showed an increased stability. CBP-tagged transhydrogenase contained a 4- to 10-fold higher amount of the alpha subunit relative to the beta subunit as compared to wild-type transhydrogenase. To determine whether the latter was due to the CBP tag, a double-tagged transhydrogenase with both an N-terminal 6x His-tag and a CBP-tag, purified by using either tag, gave no significant increase in purity as compared to the single-tagged protein. The reasons for the altered subunit composition are discussed. The results suggest that, depending on the construct, the CBP-tag may be a suitable affinity purification tag for membrane proteins in general.
Chromatography
genetics
isolation & purification
Escherichia coli
chemistry
metabolism
Humans
Genetic Vectors
chemistry
chemistry
Recombinant Fusion Proteins
ultrastructure
genetics
Protein Structure
Amino Acid Sequence
enzymology
NADP Transhydrogenase
Molecular
genetics
genetics
Protein Subunits
Calmodulin
isolation & purification
genetics
Cloning
chemistry
isolation & purification
chemistry
methods
Calmodulin-Binding Proteins
Calcium-Transporting ATPases
chemistry
isolation & purification
Affinity
chemistry
genetics
Tertiary
Cell Membrane
Membrane Proteins
genetics
chemistry
Molecular Sequence Data
Author
Maxim V Egorov
ANNA KATARINA TIGERSTRÖM
University of Gothenburg
Nikolay B Pestov
Tatyana V Korneenko
Maria B Kostina
Mikhail I Shakhparonov
Jan Rydström
University of Gothenburg
Protein Expression and Purification
1046-5928 (ISSN) 1096-0279 (eISSN)
Vol. 36 1 31-9Subject Categories
Biochemistry and Molecular Biology
DOI
10.1016/j.pep.2004.03.002
PubMed
15177281