title: Coevolution of actin and associated proteins: an alpha-actinin-like protein in a cyanobacterium (Spirulina platensis).
abstract: Actin, together with associated proteins, such as myosin, cross-linking or capping proteins, has been observed in all eukaryotic cells. Presence of actin or actin-like proteins has also been reported in prokaryotic organisms belonging to the cyanobacteria. Our aim was first to extend the characterization of an actin-like protein to another prokaryotic cell, i.e. Spirulina, then to compare the antigenic reactivity of this new protein with that of Synechocystis and skeletal actins. We observed that some of the conserved antigenic epitopes corresponded to actin regions known to interact with cross-linking proteins. We also report for the first time that alpha-actinin and filamin purified from chicken gizzard both interact with a prokaryotic actin-like protein. Finally, we searched for the occurrence of a cross-linking protein in these cyanobacteria and identified a 105-kDa protein as an alpha-actinin-like protein using specific antibodies.
authors.affiliation: UMR 5539 (CNRS), Université de Montpellier 2, France.
authors.forename: A
authors.initials: A
authors.lastname: Usmanova
authors.forename: C
authors.initials: C
authors.lastname: Astier
authors.forename: C
authors.initials: C
authors.lastname: Méjean
authors.forename: F
authors.initials: F
authors.lastname: Hubert
authors.forename: J
authors.initials: J
authors.lastname: Feinberg
authors.forename: Y
authors.initials: Y
authors.lastname: Benyamin
authors.forename: C
authors.initials: C
authors.lastname: Roustan
mesh_terms: D000185:Actinin / Q000235:genetics / Q000276:immunology / Q000378:metabolism*; D000199:Actins / Q000235:genetics / Q000276:immunology / Q000378:metabolism*; D000595:Amino Acid Sequence; D000818:Animals; D000942:Antigens, Bacterial / Q000235:genetics; D001426:Bacterial Proteins / Q000235:genetics / Q000276:immunology / Q000378:metabolism; D003429:Cross Reactions; D003432:Cross-Linking Reagents; D000458:Cyanobacteria / Q000235:genetics / Q000276:immunology / Q000378:metabolism*; D000939:Epitopes / Q000235:genetics; D019143:Evolution, Molecular; D008969:Molecular Sequence Data; D009124:Muscle Proteins / Q000378:metabolism; D013045:Species Specificity
chemical_list: D000199:Actins; D000942:Antigens, Bacterial; D001426:Bacterial Proteins; D003432:Cross-Linking Reagents; D000939:Epitopes; D009124:Muscle Proteins; D000185:Actinin