title: Fractionation of Fab glycosylated immunoglobulin G with concanavalin A chromatography unveils new structural properties of the molecule.
abstract: Concanavalin A (ConA) chromatography has been extensively used to separate asymmetric Immunoglobulin G (IgG), which possesses oligosaccharide attached to one of the two F(ab')2 arms, from symmetric IgG with no glycan attached to Fab fragments. In this study, applying affinity chromatography, silver stain, Western blot and lectin stain techniques, N- linked oligosaccharide attached to Fab fragment was demonstrated to be exposed on the surface of the protein and be accessible by ConA. In contrast, N- linked oligosaccharide attached to asparagine (Asn) 297 of IgG Fc was located in the inside of the natural protein and was inaccessible by ConA. In addition to asymmetric IgG, there are also detectable level of IgG with both F(ab')2 arms glycosylated that has not been reported previously. The discoveries of new basic molecular structure of IgG would have implications in understanding the function and properties of this important immune molecule with clinical applications.
authors.affiliation: Department of Pathology and Provincial Key Laboratory of Infectious Diseases and Immunopathology, Collaborative and Creative Center, Molecular Diagnosis and Personalized Medicine, Shantou University Medical College, Shantou, Guangdong, 515041, China.
authors.forename: Tao
authors.initials: T
authors.lastname: Huang
authors.affiliation: Department of Pathology and Provincial Key Laboratory of Infectious Diseases and Immunopathology, Collaborative and Creative Center, Molecular Diagnosis and Personalized Medicine, Shantou University Medical College, Shantou, Guangdong, 515041, China.
authors.forename: Xueling
authors.initials: X
authors.lastname: Chen
authors.affiliation: Department of Pathology and Provincial Key Laboratory of Infectious Diseases and Immunopathology, Collaborative and Creative Center, Molecular Diagnosis and Personalized Medicine, Shantou University Medical College, Shantou, Guangdong, 515041, China.
authors.forename: Huan
authors.initials: H
authors.lastname: Gu
authors.affiliation: Department of Oral Pathology, Beijing Stomatological Hospital, Capital Medical University, Beijing, 100050, China.|Department of Pathology, Beijing University Health Science Center, Beijing, 100083, China.
authors.forename: Conghui
authors.initials: C
authors.lastname: Zhao
authors.affiliation: Department of Pathology and Provincial Key Laboratory of Infectious Diseases and Immunopathology, Collaborative and Creative Center, Molecular Diagnosis and Personalized Medicine, Shantou University Medical College, Shantou, Guangdong, 515041, China.|Department of General Surgery, Second Affiliated Hospital, Shantou University Medical College, Shantou, Guangdong, 515041, China.
authors.forename: Xingmu
authors.initials: X
authors.lastname: Liu
authors.affiliation: Department of Pathology and Provincial Key Laboratory of Infectious Diseases and Immunopathology, Collaborative and Creative Center, Molecular Diagnosis and Personalized Medicine, Shantou University Medical College, Shantou, Guangdong, 515041, China.
authors.forename: Meiling
authors.initials: M
authors.lastname: Yan
authors.affiliation: Department of Pathology and Provincial Key Laboratory of Infectious Diseases and Immunopathology, Collaborative and Creative Center, Molecular Diagnosis and Personalized Medicine, Shantou University Medical College, Shantou, Guangdong, 515041, China.
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Deng
authors.affiliation: Department of Pathology and Provincial Key Laboratory of Infectious Diseases and Immunopathology, Collaborative and Creative Center, Molecular Diagnosis and Personalized Medicine, Shantou University Medical College, Shantou, Guangdong, 515041, China.
authors.forename: Zaiping
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: Department of Pathology and Provincial Key Laboratory of Infectious Diseases and Immunopathology, Collaborative and Creative Center, Molecular Diagnosis and Personalized Medicine, Shantou University Medical College, Shantou, Guangdong, 515041, China.|Department of Pathology, Beijing University Health Science Center, Beijing, 100083, China.
authors.forename: Jiang
authors.initials: J
authors.lastname: Gu
mesh_terms: D005591:Chemical Fractionation; D002845:Chromatography / Q000379:methods; D003208:Concanavalin A / Q000737:chemistry*; D006031:Glycosylation; D006801:Humans; D007140:Immunoglobulin Fab Fragments / Q000737:chemistry*; D007074:Immunoglobulin G / Q000097:blood / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: D007140:Immunoglobulin Fab Fragments; D007074:Immunoglobulin G; D003208:Concanavalin A
keywords: ConA; IgG; asymmetry; glycosylation; symmetry