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Improved immunomatrix methods to detect protein:protein interactions

Posted by on in 2003
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 Journal of Biochemical and Biophysical Methods, Volume 57, Issue 2 , 29 August 2003, Pages 143-157
Ling Ren, Daryl Emery, Barbara Kaboord, Edith Chang and M. Walid Qoronfleh
Perbio Science, Bioresearch Division, 2202 North Bartlett Avenue, Milwaukee, WI 53202-1009, USA
Received 5 June 2002; revised 16 December 2002; accepted 2 January 2003; Available online 20 June 2003.

Abstract

Immunoprecipitation (IP) and coimmunoprecipitation (co-IP) are key techniques for studying protein-protein interactions. These methods utilize immobilized Protein A or Protein G to isolate antibody-bound target antigens. The main disadvantage of traditional IP and co-IP is that the conditions used to elute the precipitated antigen also release the antibody thus contaminating the antigen and destroying the antibody support. To overcome these problems, we describe two methods to generate a reusable antibody support by cross-linking the antibody to immobilized Protein A or Protein G, or by coupling it directly to the resin (see Scheme 1). Antibody cross-linking can be done in 1 h while antibody coupling requires 4 h. IP or co-IP is accomplished by incubating the antibody resin with the protein sample. Washes and elutions are carried out in a spin column to reduce resin loss and decrease assay time. Target proteins are eluted with 0.1 M glycine (pH 2.8) and the resin-bound antibody is re-equilibrated in phosphate-buffered saline (PBS) for reuse. Our studies have demonstrated that the immobilization efficiency for the antibody coupling method was similar for several species of antibody. Furthermore, we illustrate that using both methods of antibody immobilization yield IP and co-IP results similar to traditional protocols but eliminate the antibody heavy and light chain contamination.

Author Keywords: Immunoprecipitation; Coimmunoprecipitation; Protein cross-linking; Protein-protein interactions; Proteomics

Abbreviations: IP, immunoprecipitation; co-IP, coimmunoprecipitation; PBS, phosphate-buffered saline; DSS, disuccinimidyl suberate; SDS-PAGE, sodium dodecyl sulfate-polyacrylamide gel electrophoresis; RT, room temperature; TBS, Tris-buffered saline; GFP, green fluorescent protein; DMSO, dimethyl sulfoxide; NHS, N-hydroxysuccinimidyl

Corresponding author. Tel.: +1-414-227-3605; fax: +1-414-227-3759.

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