title: Significance of a carboxyl-terminal amide moiety in the folding and biological activity of crustacean hyperglycemic hormone.
abstract: Recombinant peptides related to Pej-SGP-I, one of several crustacean hyperglycemic hormones (CHHs) existing in the kuruma prawn Penaeus japonicus, were expressed in bacterial cells, and then purified after being allowed to refold. Their circular dichroism spectra suggested that the recombinant Pej-SGP-I having a free carboxyl-terminus (rPej-SGP-I-OH) differed slightly in secondary structure from the recombinant Pej-SGP-I having an amidated C-terminus (rPej-SGP-I-amide). The hyperglycemic activity of rPej-SGP-I-amide was comparable to that of natural Pej-SGP-I, whereas rPej-SGP-I-OH showed weaker hyperglycemic activity by approximately one order of magnitude. These results indicate that the C-terminal amide of CHH affects secondary structure and is significant in conferring hyperglycemic activity.
authors.affiliation: Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi, Bunkyo, Tokyo, Japan.
authors.forename: Hidekazu
authors.initials: H
authors.lastname: Katayama
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Ohira
authors.forename: Katsumi
authors.initials: K
authors.lastname: Aida
authors.forename: Hiromichi
authors.initials: H
authors.lastname: Nagasawa
mesh_terms: D000577:Amides / Q000737:chemistry*; D000595:Amino Acid Sequence; D000818:Animals; D060829:Arthropod Proteins; D001483:Base Sequence; D002851:Chromatography, High Pressure Liquid; D002942:Circular Dichroism; D004220:Disulfides; D004305:Dose-Response Relationship, Drug; D004591:Electrophoresis, Polyacrylamide Gel; D004926:Escherichia coli / Q000378:metabolism; D005822:Genetic Vectors; D007447:Invertebrate Hormones; D013058:Mass Spectrometry; D008969:Molecular Sequence Data; D009419:Nerve Tissue Proteins / Q000737:chemistry*; D033561:Penaeidae; D010957:Plasmids / Q000378:metabolism; D011487:Protein Conformation; D017510:Protein Folding; D017433:Protein Structure, Secondary; D017434:Protein Structure, Tertiary; D011994:Recombinant Proteins / Q000737:chemistry; D013997:Time Factors; D014357:Trypsin / Q000494:pharmacology
chemical_list: D000577:Amides; D060829:Arthropod Proteins; D004220:Disulfides; D007447:Invertebrate Hormones; D009419:Nerve Tissue Proteins; D011994:Recombinant Proteins; C015947:hyperglycemic hormone, crustacean; D014357:Trypsin