Abstract Title:

Flavonoid-mediated inhibition of SARS coronavirus 3C-like protease expressed in Pichia pastoris.

Abstract Source:

Biotechnol Lett. 2012 May ;34(5):831-8. Epub 2012 Feb 15. PMID: 22350287

Abstract Author(s):

Thi Thanh Hanh Nguyen, Hye-Jin Woo, Hee-Kyoung Kang, Van Dao Nguyen, Young-Min Kim, Do-Won Kim, Sul-Ah Ahn, Yongmei Xia, Doman Kim

Article Affiliation:

Thi Thanh Hanh Nguyen


The 3C-like protease (3CL(pro)) of severe acute respiratory syndrome associated coronavirus (SARS-CoV) is vital for SARS-CoV replication and is a promising drug target. Recombinant 3CL(pro) was expressed in Pichia pastoris GS115 as a 42 kDa protein that displayed a K ( m ) of 15 ± 2 μM with Dabcyl-KTSAVLQSGFRKME-Edans as substrate. Purified 3CL(pro) was used for inhibition and kinetic assays with seven flavonoid compounds. The IC(50) of six flavonoidcompounds were 47-381 μM. Quercetin, epigallocatechin gallate and gallocatechin gallate (GCG) displayed good inhibition toward 3CL(pro) with IC(50) values of 73, 73 and 47 μM, respectively. GCG showed a competitive inhibition pattern with K ( i) value of 25 ± 1.7 μM. In molecular docking experiments, GCG displayed a binding energy of -14 kcal mol(-1) to the active site of 3CL(pro) and the galloyl moiety at 3-OH position was required for 3CL(pro) inhibition activity.

Study Type : In Vitro Study

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