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. 1999 Apr;8(4):760–770. doi: 10.1110/ps.8.4.760

Actin surface structure revealed by antibody imprints: evaluation of phage-display analysis of anti-actin antibodies.

A J Jesaitis 1, D Gizachew 1, E A Dratz 1, D W Siemsen 1, K C Stone 1, J B Burritt 1
PMCID: PMC2144298  PMID: 10211822

Abstract

Phage-display peptide library analysis of an anti-F actin polyclonal antibody identified 12 amino acid residues of actin that appear, in its X-ray crystal structure, to be grouped together in a surface accessible conformational epitope. Phage epitope mapping was carried out by isolating immune complexes containing members of the J404 nonapeptide phage-display library formed in diluted antiserum and isolated on a protein A affinity matrix. Immunoreactive clones were grown as plaques, replica plated onto nitrocellulose, and labeled with anti-actin immune serum. One hundred and forty-four positively staining clones identified in this way were sequenced. Of these, 54 displayed peptides with sequence similarities. When the most abundantly selected sequence, KQTWQQLWD, was produced as a synthetic peptide and derivatized to ovalbumin, the complex was strongly recognized by the antiserum on Western blots and inhibited the binding of the antibody to immobilized F-actin by 60%. A scrambled version of this sequence WQDK WLQTQ, when coupled to ovalbumin, was not recognized by the antiserum and minimally inhibited binding of antiserum to immobilized F-actin by 10%. KQTWQQLWD contained four residues that corresponded, in frame, to a highly conserved six residue region of the chicken beta-actin sequence 351TFQQMW356 (identical residues are shown in bold). Examination of the rabbit skeletal muscle X-ray crystal structure suggested that within a 15 A radius of W356, nine additional residues were arranged on the actin surface in such a way that they could be mimicked by several of the selected phage sequences with root-mean-square deviation fits of 2.1-2.5 A. We conclude that phage-display analysis can provide information about the relative location of amino acids on the surfaces of proteins using antibody imprints of the protein surface structure.

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Selected References

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