Partial characterization of the MPM-2 phosphoepitope

Min Ding, Yang Feng, Dale D. Vandré

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

The MPM-2 monoclonal antibody recognizes a distinctive group of proteins that are associated with structural components of the mitotic apparatus. These proteins become phosphorylated and MPM-2 reactive during M- phase and appear to be required for both the onset and completion of M- phase. Based upon the analysis of reported MPM-2 reactive sequences, we have developed a model for the essential elements that comprise the MPM-2 epitope. This model was tested by employing a series of synthetic phosphopeptides. We show here that a 14 amino acid synthetic phosphopeptide, derived from a potential MPM-2 site on human DNA topoisomerase II, is recognized by the MPM2 antibody. This phosphopeptide was sufficient to compete for MPM-2 antibody recognition of (1) an isolated native mitotic MPM-2 antigen on dot blots, (2) proteins on immunoblots of mitotic cell lysates, and (3) specific immunostaining of mitotic cells. These results indicated that the topoisomerase peptide contained all of the essential elements of the MPM-2 epitope. By substituting selected amino acids with alanine, we were able to examine the contribution of different amino acids to the binding between the MPM-2 antibody and the epitope. Changing the amino acid that was adjacent to the phosphorylated threonine residue on the C-terminal side (the +1 position) had no effect on MPM-2 antibody binding. However, substitution of aromatic amino acids at either the -2 or +2 positions reduced antibody recognition. The aromatic amino acid at the -2 position appeared to be the most critical residue of those tested that influenced antibody binding. These results provide information required for the molecular definition of the MPM-2 epitope and should aid in the identification of potential MPM-2 reactive sites on other mitotic phosphoproteins.

Original languageEnglish (US)
Pages (from-to)3-13
Number of pages11
JournalExperimental Cell Research
Volume231
Issue number1
DOIs
StatePublished - Feb 25 1997

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Phosphopeptides
Antibodies
Epitopes
Amino Acids
Aromatic Amino Acids
Cell Division
Type II DNA Topoisomerase
Spindle Apparatus
Proteins
Phosphoproteins
Threonine
Alanine
Catalytic Domain
Monoclonal Antibodies
Antigens
Peptides

All Science Journal Classification (ASJC) codes

  • Cell Biology

Cite this

Ding, Min ; Feng, Yang ; Vandré, Dale D. / Partial characterization of the MPM-2 phosphoepitope. In: Experimental Cell Research. 1997 ; Vol. 231, No. 1. pp. 3-13.
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Partial characterization of the MPM-2 phosphoepitope. / Ding, Min; Feng, Yang; Vandré, Dale D.

In: Experimental Cell Research, Vol. 231, No. 1, 25.02.1997, p. 3-13.

Research output: Contribution to journalArticle

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