title: Distinct Ig H chains in a primitive vertebrate, Eptatretus stouti.
abstract: Serum Ig from the Pacific hagfish, Eptatretus stouti, was isolated by affinity chromatography using a specific mAb (H.45). Analysis of the approximately 210-kDa molecule by SDS-PAGE under reducing conditions revealed two H chains of approximately 77 kDa (H1) and approximately 70 kDa (H2) and L chains of approximately 30 kDa. H1 and H2 were shown to differ with respect to their peptide maps, amino-terminal amino acid sequences, and reactivity to the mAb H.45, suggesting that they represent discrete H chain isotypes. Two-dimensional nonreducing/reducing SDS-PAGE demonstrated that H and L chains were covalently linked predominantly as H-H-L and H-L configurations. Noncovalently bound L chains were also found. H-H-L complexes were shown to contain H1-H2 heterodimers of H chains in addition to H1-H1 homodimers.
authors.affiliation: Clinical Immunology Research Centre, University of Sydney, NSW, Australia.
authors.forename: P J
authors.initials: PJ
authors.lastname: Hanley
authors.forename: I M
authors.initials: IM
authors.lastname: Seppelt
authors.forename: A A
authors.initials: AA
authors.lastname: Gooley
authors.forename: J W
authors.initials: JW
authors.lastname: Hook
authors.forename: R L
authors.initials: RL
authors.lastname: Raison
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D004591:Electrophoresis, Polyacrylamide Gel; D006196:Hagfishes / Q000276:immunology*; D007143:Immunoglobulin Heavy Chains / Q000032:analysis*; D008970:Molecular Weight; D010455:Peptides / Q000032:analysis; D011948:Receptors, Antigen, T-Cell / Q000032:analysis
chemical_list: D007143:Immunoglobulin Heavy Chains; D010455:Peptides; D011948:Receptors, Antigen, T-Cell