title: The evolution of extracellular hemoglobins of annelids, vestimentiferans, and pogonophorans.
abstract: The evolution of extracellular hemoglobins of annelids, vestimentiferans, and pogonophorans was investigated by applying cladistic and distance-based approaches to reconstruct the phylogenetic relationships of this group of respiratory pigments. We performed this study using the aligned sequences of globin and linker chains that are the constituents of these complex molecules. Three novel globin and two novel linker chains of Sabella spallanzanii described in an accompanying paper (Pallavicini, A., Negrisolo, E., Barbato, R., Dewilde, S., Ghiretti-Magaldi, A., Moens, L., and Lanfranchi, G. (2001) J. Biol. Chem. 276, 26384--26390) were also included. Our results allowed us to test previous hypotheses on the evolutionary pathways of these proteins and to formulate a new most parsimonious model of molecular evolution. According to this novel model, the genes coding for the polypeptides forming these composite molecules were already present in the common ancestor of annelids, vestimentiferans, and pogonophorans.
authors: Dipartimento di Biologia and Centro di Ricerca Interdipartimentale per le Biotecnologie Innovative, Università di Padova, Via Ugo Bassi 58/B, 35131 Padova, Italy.
authors: E
authors: E
authors: Negrisolo
authors: A
authors: A
authors: Pallavicini
authors: R
authors: R
authors: Barbato
authors: S
authors: S
authors: Dewilde
authors: A
authors: A
authors: Ghiretti-Magaldi
authors: L
authors: L
authors: Moens
authors: G
authors: G
authors: Lanfranchi
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000845:Annelida; D019143:Evolution, Molecular; D006454:Hemoglobins / Q000235:genetics*; D008969:Molecular Sequence Data; D010802:Phylogeny; D011077:Polychaeta; D016415:Sequence Alignment; D017421:Sequence Analysis
chemical_list: D006454:Hemoglobins