title: The cDNA-derived amino acid sequence of hemoglobin II from Lucina pectinata.
abstract: Hemoglobin II from the clam Lucina pectinata is an oxygen-reactive protein with a unique structural organization in the heme pocket involving residues Gln65 (E7), Tyr30 (B10), Phe44 (CD1), and Phe69 (E11). We employed the reverse transcriptase-polymerase chain reaction (RT-PCR) and methods to synthesize various cDNA(HbII). An initial 300-bp cDNA clone was amplified from total RNA by RT-PCR using degenerate oligonucleotides. Gene-specific primers derived from the HbII-partial cDNA sequence were used to obtain the 5' and 3' ends of the cDNA by RACE. The length of the HbII cDNA, estimated from overlapping clones, was approximately 2114 bases. Northern blot analysis revealed that the mRNA size of HbII agrees with the estimated size using cDNA data. The coding region of the full-length HbII cDNA codes for 151 amino acids. The calculated molecular weight of HbII, including the heme group and acetylated N-terminal residue, is 17,654.07 Da.
authors.affiliation: Department of Chemistry, University of Puerto Rico, Mayagüez, P.O. Box 9019, Mayagüez, Puerto Rico 00681-9019, USA.
authors.forename: Elineth
authors.initials: E
authors.lastname: Torres-Mercado
authors.forename: Jessicca Y
authors.initials: JY
authors.lastname: Renta
authors.forename: Yolanda
authors.initials: Y
authors.lastname: Rodríguez
authors.forename: Juan
authors.initials: J
authors.lastname: López-Garriga
authors.forename: Carmen L
authors.initials: CL
authors.lastname: Cadilla
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D001665:Binding Sites; D049872:Bivalvia / Q000235:genetics*; D015152:Blotting, Northern; D003001:Cloning, Molecular; D003062:Codon; D018076:DNA, Complementary / Q000096:biosynthesis / Q000737:chemistry*; D006454:Hemoglobins / Q000737:chemistry / Q000235:genetics*; D008969:Molecular Sequence Data; D012333:RNA, Messenger / Q000032:analysis; D020133:Reverse Transcriptase Polymerase Chain Reaction; D016415:Sequence Alignment
chemical_list: D003062:Codon; D018076:DNA, Complementary; D006454:Hemoglobins; D012333:RNA, Messenger