title: Amino acid sequence of myoglobin from the mollusc Dolabella auricularia.
abstract: The complete amino acid sequence of the myoglobin from Dolabella auricularia, a common gastropodic mollusc on the Japanese coast, has been determined. The myoglobin is composed of 146 amino acid residues, is acetylated at the NH2 terminus, and contains a single histidine residue at position 95 which most likely corresponds to the heme-binding proximal histidine. The sequence of Dolabella myoglobin shows strong homology (72-77%) with those of Aplysia myoglobins. The autoxidation rate of Dolabella oxymyoglobin (MbO2) was examined in 0.1 M buffer at 25 degrees C over pH range 4.8-12. Dolabella MbO2 was extremely unstable between pH 7 and 11, and the pH dependence of the stability was quite different from that of sperm whale MbO2. This property may be partly due to the absence of a distal (E7) histidine in Dolabella myoglobin.
mesh_terms: D000595:Amino Acid Sequence; D000596:Amino Acids / Q000032:analysis; D000818:Animals; D001048:Aplysia / Q000032:analysis; D006863:Hydrogen-Ion Concentration; D008974:Mollusca / Q000032:analysis*; D009211:Myoglobin / Q000032:analysis*
chemical_list: D000596:Amino Acids; D009211:Myoglobin