title: [The molecular mechanism of interaction of trivalent dimethylarsinous acid (DMA(III)) binding to rat hemoglobin].
abstract: In our previous work, we found that trivalent dimethylarsinous acid (DMA(III)) have high affinity binding to cysteine residue 13 of rat hemoglobin. However, it is still unknown why arsenic intermediate metabolite DMA(III) has high binding affinity for Cysl3 but not for other cysteine residues 93, 140, 111 and 125. In order to better understand the molecular mechanism of DMA(III) with rat hemoglobin, we have done current study. So, SD rats were divided into control and arsenic-treated groups randomly. Arsenic species in lysate of red blood cells were analyzed by HPLC-ICP-MS, and then determined by a hybrid quadrupole TOF MS. In addition, trivalent DMA(III) binds to different cysteine residues in rat hemoglobin alpha and beta chains were also simulated by Molecular Docking. Only Cys13 in alpha chain is able to bind to DMA(III) from the experiment results. Cys13 of alpha chain in rat hemoglobin is a specific binding site for DMA(III), and we found that amino acids compose pockets structure and surround Cys13 (but not other cysteine residues), make DMA(III) much easy to bind cysteine 13. Taken together, the DMA(III) specific binding to Cys13 is related to spatial structure of Cys13.
authors.forename: Min
authors.initials: M
authors.lastname: Zhang
authors.forename: Wen-Wen
authors.initials: WW
authors.lastname: Wang
authors.forename: Hui-Fang
authors.initials: HF
authors.lastname: Jin
authors.forename: Ling-Ling
authors.initials: LL
authors.lastname: Bao
authors.forename: Hua
authors.initials: H
authors.lastname: Naranmandura
authors.forename: Ying-Jie
authors.initials: YJ
authors.lastname: Qin
authors.forename: Chun-Hui
authors.initials: CH
authors.lastname: Li
mesh_terms: D000818:Animals; D001151:Arsenic / Q000378:metabolism; D001665:Binding Sites; D002101:Cacodylic Acid / Q000031:analogs & derivatives* / Q000737:chemistry; D002851:Chromatography, High Pressure Liquid; D003545:Cysteine / Q000378:metabolism; D006454:Hemoglobins / Q000378:metabolism*; D013058:Mass Spectrometry; D010446:Peptide Fragments / Q000378:metabolism*; D051381:Rats
chemical_list: D006454:Hemoglobins; D010446:Peptide Fragments; C472511:dimethylarsinous acid; C070077:alpha(A) globin; D002101:Cacodylic Acid; D003545:Cysteine; D001151:Arsenic