title: Evidence for the existence of [Gln9]-beta-lipotropin in human pituitary glands.
abstract: The isolation of two peptides similar in amino acid composition to that of human beta-lipotropin is presented. Peptide patterns after enzymatic digestions of these two peptides by Staphylococcus aureus protease and by trypsin were nearly identical. Paper electrophoresis and amino acid analyses of acidic peptides generated from the enzymatic digestions of these two peptides indicate that there is an amide difference between the two peptides. It is proposed that this amide difference is in amino acid residue number nine, and that one is the human beta-lipotropin and the other its [Gln9] analog.
mesh_terms: D000595:Amino Acid Sequence; D006801:Humans; D010446:Peptide Fragments / Q000302:isolation & purification; D010902:Pituitary Gland / Q000032:analysis*; D008083:beta-Lipotropin / Q000031:analogs & derivatives* / Q000302:isolation & purification
chemical_list: D010446:Peptide Fragments; D008083:beta-Lipotropin; C044979:beta-lipotropin, Gln(9)-