title: Dieckol, a SARS-CoV 3CL(pro) inhibitor, isolated from the edible brown algae Ecklonia cava.
abstract: SARS-CoV 3CL(pro) plays an important role in viral replication. In this study, we performed a biological evaluation on nine phlorotannins isolated from the edible brown algae Ecklonia cava. The nine isolated phlorotannins (1-9), except phloroglucinol (1), possessed SARS-CoV 3CL(pro) inhibitory activities in a dose-dependently and competitive manner. Of these phlorotannins (1-9), two eckol groups with a diphenyl ether linked dieckol (8) showed the most potent SARS-CoV 3CL(pro) trans/cis-cleavage inhibitory effects (IC(50)s = 2.7 and 68.1 μM, respectively). This is the first report of a (8) phlorotannin chemotype significantly blocking the cleavage of SARS-CoV 3CL(pro) in a cell-based assay with no toxicity. Furthermore, dieckol (8) exhibited a high association rate in the SPR sensorgram and formed extremely strong hydrogen bonds to the catalytic dyad (Cys145 and His41) of the SARS-CoV 3CL(pro).
authors: Infection Control Research Center, Korea Research Institute of Bioscience and Biotechnology, Jeongeup 580-185, Republic of Korea.
authors: Ji-Young
authors: JY
authors: Park
authors: Jang Hoon
authors: JH
authors: Kim
authors: Jung Min
authors: JM
authors: Kwon
authors: Hyung-Jun
authors: HJ
authors: Kwon
authors: Hyung Jae
authors: HJ
authors: Jeong
authors: Young Min
authors: YM
authors: Kim
authors: Doman
authors: D
authors: Kim
authors: Woo Song
authors: WS
authors: Lee
authors: Young Bae
authors: YB
authors: Ryu
mesh_terms: D000998:Antiviral Agents / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology; D001572:Benzofurans / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology; D057056:Cysteine Proteases / Q000378:metabolism; D015853:Cysteine Proteinase Inhibitors / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology; D006801:Humans; D062105:Molecular Docking Simulation; D000459:Phaeophyceae / Q000737:chemistry*; D021281:Quantitative Structure-Activity Relationship; D045473:Severe acute respiratory syndrome-related coronavirus / Q000187:drug effects / Q000201:enzymology*; D045169:Severe Acute Respiratory Syndrome / Q000188:drug therapy
chemical_list: D000998:Antiviral Agents; D001572:Benzofurans; D015853:Cysteine Proteinase Inhibitors; C503840:dieckol; D057056:Cysteine Proteases
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