title: Purification of mitochondrial proteins HSP60 and ATP synthase from ascidian eggs: implications for antibody specificity.
abstract: Use of antibodies is a cornerstone of biological studies and it is important to identify the recognized protein with certainty. Generally an antibody is considered specific if it labels a single band of the expected size in the tissue of interest, or has a strong affinity for the antigen produced in a heterologous system. The identity of the antibody target protein is rarely confirmed by purification and sequencing, however in many cases this may be necessary. In this study we sought to characterize the myoplasm, a mitochondria-rich domain present in eggs and segregated into tadpole muscle cells of ascidians (urochordates). The targeted proteins of two antibodies that label the myoplasm were purified using both classic immunoaffinity methods and a novel protein purification scheme based on sequential ion exchange chromatography followed by two-dimensional gel electrophoresis. Surprisingly, mass spectrometry sequencing revealed that in both cases the proteins recognized are unrelated to the original antigens. NN18, a monoclonal antibody which was raised against porcine spinal cord and recognizes the NF-M neurofilament subunit in vertebrates, in fact labels mitochondrial ATP synthase in the ascidian embryo. PMF-C13, an antibody we raised to and purified against PmMRF, which is the MyoD homolog of the ascidian Phallusia mammillata, in fact recognizes mitochondrial HSP60. High resolution immunolabeling on whole embryos and isolated cortices demonstrates localization to the inner mitochondrial membrane for both ATP synthase and HSP60. We discuss the general implications of our results for antibody specificity and the verification methods which can be used to determine unequivocally an antibody's target.
authors: Université Pierre et Marie Curie and CNRS, Developmental Biology Unit UMR7009, Villefranche-sur-mer, France. chenevert@obs-vlfr.fr
authors: Janet
authors: J
authors: Chenevert
authors: Gerard
authors: G
authors: Pruliere
authors: Hirokazu
authors: H
authors: Ishii
authors: Christian
authors: C
authors: Sardet
authors: Takahito
authors: T
authors: Nishikata
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000906:Antibodies / Q000378:metabolism; D000911:Antibodies, Monoclonal / Q000378:metabolism; D018834:Chaperonin 60 / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D002852:Chromatography, Ion Exchange; D015180:Electrophoresis, Gel, Two-Dimensional; D004625:Embryo, Nonmammalian / Q000166:cytology / Q000196:embryology / Q000378:metabolism; D005260:Female; D015151:Immunoblotting; D017403:In Situ Hybridization; D008297:Male; D051336:Mitochondrial Membranes / Q000378:metabolism; D024101:Mitochondrial Proteins / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D025261:Mitochondrial Proton-Translocating ATPases / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D008969:Molecular Sequence Data; D010063:Ovum / Q000378:metabolism*; D011485:Protein Binding; D017386:Sequence Homology, Amino Acid; D014561:Urochordata / Q000196:embryology / Q000235:genetics / Q000378:metabolism*
chemical_list: D000906:Antibodies; D000911:Antibodies, Monoclonal; D018834:Chaperonin 60; D024101:Mitochondrial Proteins; D025261:Mitochondrial Proton-Translocating ATPases