title: Protein domain of chicken alpha(1)-acid glycoprotein is responsible for chiral recognition.
abstract: Ovoglycoprotein from chicken egg whites (OGCHI) has been used as a chiral selector to separate drug enantiomers. However, neither the amino acid sequence of OGCHI nor the responsible part for the chiral recognition (protein domain or sugar moiety) has yet to be determined. First, we isolated a cDNA clone encoding OGCHI, and clarified the amino acid sequence of OGCHI, which consists of 203 amino acids including a predictable signal peptide of 20 amino acids. The mature OGCHI shows 31-32% identities to rabbit and human alpha(1)-acid glycoproteins (alpha(1)-AGPs). Thus, OGCHI should be the chicken alpha(1)-AGP. Second, the recombinant chicken alpha(1)-AGP was prepared by the Escherichia coli expression system, and its chiral recognition ability was confirmed by capillary electrophoresis. Since proteins expressed in E. coli are not modified by any sugar moieties, this result shows that the protein domain of the chicken alpha(1)-AGP is responsible for the chiral recognition.
authors.affiliation: Faculty of Pharmaceutical Sciences, Toyama Medical and Pharmaceutical University, 2630 Sugitani, Japan. sadapon@toyama-mpu.ac.jp
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Sadakane
authors.forename: Hisami
authors.initials: H
authors.lastname: Matsunaga
authors.forename: Kazuya
authors.initials: K
authors.lastname: Nakagomi
authors.forename: Yasumaru
authors.initials: Y
authors.lastname: Hatanaka
authors.forename: Jun
authors.initials: J
authors.lastname: Haginaka
mesh_terms: D000595:Amino Acid Sequence; D000596:Amino Acids / Q000737:chemistry; D000818:Animals; D001483:Base Sequence; D002645:Chickens; D003001:Cloning, Molecular; D018076:DNA, Complementary / Q000378:metabolism; D004926:Escherichia coli / Q000378:metabolism; D006023:Glycoproteins / Q000737:chemistry; D006031:Glycosylation; D008969:Molecular Sequence Data; D009961:Orosomucoid / Q000737:chemistry* / Q000378:metabolism*; D017434:Protein Structure, Tertiary; D011817:Rabbits; D011994:Recombinant Proteins / Q000737:chemistry / Q000378:metabolism; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid; D013997:Time Factors; D014049:Tolperisone / Q000737:chemistry
chemical_list: D000596:Amino Acids; D018076:DNA, Complementary; D006023:Glycoproteins; D009961:Orosomucoid; D011994:Recombinant Proteins; D014049:Tolperisone