title: Structural and functional alterations of myoglobin by glucose-protein interactions.
abstract: The interaction of blood glucose with heme proteins plays a key role in inducing diabetes, a serious disease threatening human health. In this study, we investigated the non-covalent interaction between glucose and myoglobin (Mb), both theoretically and experimentally, using molecular dynamics (MD) simulation combined with spectroscopic studies. It revealed that glucoses can occupy the side pocket of Mb, and bind closely to one of the xenon cavities in Mb, by hydrogen bonding interactions with two propionate groups of heme as well as surrounding amino acids. These interactions alter the conformation of the heme active site slightly and lead to an enhanced peroxidase activity of Mb, as determined by kinetic studies. This study provides general information for glucose-heme proteins interactions, and also for blood glucose-protein interactions for patients with diabetes.
authors.affiliation: Institute of Cardiovascular Disease & Key Lab for Arteriosclerology of Human Province, University of South China, Hengyang, 421001, China.
authors.forename: Yong
authors.initials: Y
authors.lastname: You
authors.forename: Fang
authors.initials: F
authors.lastname: Liu
authors.forename: Ke-Jie
authors.initials: KJ
authors.lastname: Du
authors.forename: Ge-Bo
authors.initials: GB
authors.lastname: Wen
authors.forename: Ying-Wu
authors.initials: YW
authors.lastname: Lin
mesh_terms: D001665:Binding Sites; D020134:Catalytic Domain; D005947:Glucose / Q000737:chemistry / Q000378:metabolism*; D006860:Hydrogen Bonding; D006861:Hydrogen Peroxide / Q000737:chemistry / Q000378:metabolism; D007700:Kinetics; D056004:Molecular Dynamics Simulation; D015394:Molecular Structure; D009211:Myoglobin / Q000737:chemistry / Q000378:metabolism*; D010544:Peroxidases / Q000737:chemistry / Q000378:metabolism*; D011485:Protein Binding; D011487:Protein Conformation; D013056:Spectrophotometry, Ultraviolet; D013329:Structure-Activity Relationship; D013379:Substrate Specificity
chemical_list: D009211:Myoglobin; D006861:Hydrogen Peroxide; D010544:Peroxidases; D005947:Glucose