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https://doi.org/10.1021/bp990058l

has been cited by the following article:

• TITLE: Development and Applications of a Calmodulin-Based Fusion Protein System for the Expression and Purification of WW and Zinc Finger Modules

  AUTHORS: Christopher G. Toomey, David Weiss, Alan Chant, Megan Ackerman, Bethany A. Ahlers, Ying-Wai Lam, Christopher Ricciardi, Dana Bourne, Christina M. Kraemer-Chant

  KEYWORDS: Biomaterials, Protein Purification, Expression Systems, Protein Expression

  JOURNAL NAME: Advances in Biological Chemistry, Vol.7 No.2, April 25, 2017

  ABSTRACT: Calmodulin from Homo sapiens is an α-helical calcium-binding protein that expresses to high levels in E. coli. When the N-terminus of a calmodulin variant is bound to Ca2+, it undergoes a conformational change, exposing hydrophobic pockets. This property can be utilized for purification purposes, as these pockets bind to phenyl sepharose resin with high affinity. Washing with EDTA chelates the Ca2+ ions from the protein, inducing a conformational change back to the more folded state and eluting the protein from the column. We describe herein the use of a protein expression and purification technique using the calmodulin variant and a short linker for proteolytic cleavage by the mutant NIa-Pro tobacco etch virus protease. We have shown this approach to be useful in obtaining purified quantities of various small proteins that could not be expressed using other methods, including high enough concentrations of a designed WW domain protein for NMR structural analysis. We have also obtained promising results on the usefulness of this procedure to express and purify zinc finger proteins without the addition of zinc ions or other cofactors.